GM 17122490
Valve Lifters

You should start the Lash Adjuster replacement process by removing right valve Rocker Arm covers and gaskets before proceeding to remove left valve Rocker Arm. After removing the lower Intake Manifold and its gaskets move forward by keeping all valve train parts in their original order as you reinstall them with the same mating surfaces. Demount everything starting with rocker arms, pushrods, and pedestals before taking out valve guide retainer bolts and the valve guide retainer. Clean all gasket surfaces with degreaser while performing a thorough inspection of lash adjusters for wear and cam lobes for wear alongside valve train parts inspection. The lash adjusters should undergo a dip process with prelude gm p/n 12345501 or equivalent and will then be ready for installation with the lash adjusters before the Lash Adjuster guides and valve guide retainer. First tighten the valve guide retainer bolts to 30 nm (22 ft. Lbs.) then reinstall the valve rocker arms with the pushrods and pedestals. Complete the installation by fitting the lower Intake Manifold with gaskets and then adding right and left valve Rocker Arm covers that have gaskets on top.

The process starts with removing rocker arms and push rods followed by lower Intake Manifold removal before valve train parts need to be organized for reinstallation. Begin by removing each valve lifter guide bolt before you can extract the valve lifter guides and subsequently the valve lifters. All surfaces that need gasket contact and all valve train components need complete cleaning. The valve lifters need prelube treatment before installation using part number: specified in adhesives fluids lubricants and sealers. The user should proceed by installing the valve lifters into their original positions while using adhesives, fluids, lubricants, and sealers specified in the document (Part Number). Replace the valve lifter guides and bolt them down with 30 n.m (22 lb ft) torque specification. The valve rocker arms and push rods must be reinstalled before placing the lower Intake Manifold into position.

Start by taking out the right valve Rocker Arm covers with gaskets and next remove the left valve Rocker Arm. Take off both the lower Intake Manifold and accompanying gaskets but maintain the valve train components in their proper places for reinstalling later. The technician should handle rocker arms, pushrods, and pedestals followed by removing valve guide retainer bolts and retainer pieces. To access the lash adjusters you need to take out the Lash Adjuster guides. The work calls for degreaser cleaning and surface inspection of gaskets and valve train parts and lash adjusters and cam lobe wear assessment. Lash adjusters should be soaked in prelube gm p/n 12345501 or equivalent before their installation together with Lash Adjuster guides. The valve guide retainer should be reinstalled followed by torquing the valve guide retainer bolts to 30 nm (22 ft. Lbs.). Reinstall the valve rocker arms and pushrods before installing the pedestals and lower Intake Manifold with its gaskets and finally add the right and left valve Rocker Arm covers and their gaskets.

Tools required include: torque angle meter (J 36660-A) and Camshaft sprocket holding tool (J 44222). Start off by unbolting the Camshaft cover, the bolts for exhaust and intake sprockets. Mount the Camshaft sprocket holding tool (J 44222) to the Cylinder Head, aligning the horizontal bolts with the Camshaft sprockets to keep chain tension and avoid interference with the timing chain objects. Very carefully remove the sprockets that are paired with the timing chain from the camshafts and store the Camshaft caps in a rack for proper reinstallation later on. Remove the Camshaft cap bolts after which remove the camshafts caps and then camshafts. Organize the removed rocker arms and valve lash adjusters to reinstall in their original position and location. Take off the valve rocker arms and valve lash adjusters. For installation, lubricate and fill the valve lash adjusters with engine oil, and install them back using their original installation locations. Lubricate the valve Rocker Arm roller and place the valve rocker arms back to their original positions, put engine oil on Camshaft journals prior to reinstallation of camshafts. Install the Camshaft caps onto the original journals and tighten the Camshaft caps bolts to 12nm (106 inch lbs). Take detailed steps to reposition Camshaft sprockets onto the camshafts and remove the Camshaft sprocket holding tool (J 44222). The intake Camshaft sprocket washer and bolt, and the exhaust Camshaft actuator bolt need to be installed and tightened, with the intake Camshaft sprocket bolt to 20 nm (15 ft. Lbs.) on the first turn, then with the torque angle meter (J 36660-A) 100 more degrees. Tighten the exhaust Camshaft actuator bolt to 25 nm (18 ft. Lbs. On the first pass then 135 degrees using Torque Angle Meter (J 36660-A). Finally, install the Camshaft cover.

Start the Lash Adjuster replacement by removing valve Rocker Arm covers followed by the upper and lower intake manifolds. The next step requires removing Rocker Arm bolts followed by valve rocker arms and push rod guide plates where all parts must stay organized for future reinstallation. Pull out the pushrod(s) and also remove the Lash Adjuster guide bolts and guide(s) and Lash Adjuster(s) from their locations. Clear all valve train components using degreaser before checking both the lash adjusters and cam lobe surfaces for damage. Dip all lash adjusters in prelube solution gm p/n 12345501 or equivalent then position them back to their original locations during installation. After Lash Adjuster guide installation insert the guide bolts and tighten them to 30 nm (22 ft. Lbs.). Follow installation by adding pushrods followed by push rod guides and valve rocker arms and closing with bolts. Put the lower Intake Manifold and upper Intake Manifold along with valve Rocker Arm covers back into place.

The first step to repair the lash adjusters (209, 219) in the rpo l92 - first design involves removing the Cylinder Head and gasket then the Lash Adjuster guide bolts (211). Remove the Lash Adjuster guides (210) together with their adjusters while keeping track of their previous order because the guide notches should face the engine block locating tabs. Strip the lash adjusters from their guide before cleaning them for inspection when needed. To reinstall the adjusters replace them in their original positions so that each four-valve guide assembly contains two both active fuel management adjusters and two both non-active fuel management adjusters. Put clean engine oil on lash adjusters and guide bore surfaces before placing each adjuster into its guide. Accomplish this step by having flat areas on active and non-active fuel management adjusters match adjuster guide bore flat areas and by lining up the notch in the guide with the raised area on the active fuel management adjuster. Screw in the lash adjusters and guide (210) onto the engine block using the Lash Adjuster guide bolts (211) set to 12 n.m (106 lb in) torque, and afterward put back the Cylinder Head with its gasket.

The first step to replace valve lifters is to remove the lower Intake Manifold and right or left valve rocker cover. Ensure all valve train parts stay properly organized before reinstalling everything in their original positions with matching surfaces intact. Begin by taking out the valve Rocker Arm bolt(s) and valve Rocker Arm(s) and push rod(s) and push rod guide plate(s), followed by extracting the valve lifter guide bolts and valve lifter guide(s). Clean the valve lifter guides while inspecting the cam lobe for signs of wear. Remove all lifting shafts to cleanse their gasket mating surfaces before installation. Install the valve lifters by dipping them in prelude gm (12345501) or equivalent product then position them exactly where they originally were. Secure the valve lifter guides through valve lifter guide bolts until they reach 30 nm (22 ft. Lbs.). Reinstallation begins with push rod guide plates followed by push rods and then valve rocker arms before finishing with valve Rocker Arm bolts and finally the right or left valve rocker covers and the lower Intake Manifold.

You should remove the involved Camshaft(s) by following the Camshaft replacement - right side (SFI) procedure before changing the Lash Adjuster on the right side. After that, take off the rocker arms by using the valve Rocker Arm removal - right side instructions. After that, take out the adjusters by carefully following the Lash Adjuster removal - left side (LY7/LP1) and Lash Adjuster removal - left side (DI) procedures. After the removal, clean and check the Camshaft(s) and Rocker Arm(s), fixing or changing them as needed, using the Camshaft cleaning and inspection and lash adjusters cleaning and inspection instructions. Begin installing by putting on the adjusters as described in Lash Adjuster installation - right side, then fit the rocker arms as described in valve Rocker Arm installation - right side, and afterwards, put in the Camshaft(s) using Camshaft replacement - right side (SFI).

To service and repair the Lash Adjuster on the right side, first serving, take off the right camshafts. Then, extract the lash adjusters from the bores using a magnet and arrange them in a rack in a sequential way to ensure that they can be reinstalled in their original sequence in case they wish to be reused before the end of their useful life. For installation, lubricate the lash adjusters using prelube (GM P/N United States 1052367, GM P/N Canada 992869 or equiv.) if they are reinstalling in their original position not being replaced. Finally, reinstall the right camshafts.

First, the removal of the Cylinder Head and its gasket, valve lifter guide bolts to be taken off. Use the valve lifter remover (J 3049-A) to remove the valve lifters and guide, if only some lifters are stuck on account of gum and varnish deposits. Having removed the valve lifters from the guide, arrange or label the parts for their proper replacement. Only if it is required, clean and inspect the valve lifters. On a re-installation, reused valve lifters should be installed back at their original positions. Apply some clean engine oil to lubricate the valve lifters and engine block valve-lifter bores before inserting the lifters into the lifter guides, ensuring that the flat area of the top of the lifter is parallel with the flat area in the bore of the lifter guide. Your next step should be to push the lifter all the way into the guide bore and install the valve lifters, guide to the engine block. Mount the valve lifter guide bolts and then clamp it in place with 12 nm (106 inch lbs.) and then mount the Cylinder Head and gasket.

Engine repair professionals must detach both the Cylinder Head and the gasket before accessing the lash adjusters (209) within ly2, ly6 and l92 engines. Start by removing both Lash Adjuster guide bolts (211) and Lash Adjuster guides (210) together alongside their respective adjusters. Make a note of the current guide positioning because their notched area should match up with the block's locating tab. For Lash Adjuster (209) removal from guide (210) separate each component then create installation reference systems. Clean all lash adjusters before performing necessary inspections. Before you place lash adjusters (209) into the adjuster guides (210), you should apply engine oil to both components and put the adjusters fully inside the guide bores. Ensure the flat notch on each adjuster matches its corresponding flat area in the guide bores. Place the engine block lash adjusters and guide (210) in position and follow the fastener notice before installing the Lash Adjuster guide bolts to a torque of 12 n.m (106 lb in). Install the Cylinder Head after it has been combined with its gasket.

To remove the valve lifters, first, you will need to collect the necessary tools, such as the valve lifter remover (J 3049-A). Start by taking out the lower Intake Manifold, followed by rocker arms of valves and valve pushrods that are placed in a rack to be put back in their original positions. Next, take out the bolts and valve lifter Pushrod guide, and keep the valve lifters upright on the rack to keep oil inside them. If any valve livers are stuck by options of gum or varnish deposits use valve lifter remover (J 3049-A) to remove it. Clean out the valve lifter bores with a solvent and check valve lifter bores for excessive wear/scoring and replace the engine block if need be. Also, check Camshaft for wear or breakage and if questionable, pull it out for further inspection. Mark, sort and organize; all components for assembly, and then clean with solvent and dry, using compressed air. Inspect the valve lufter Pushrod guides for their excessive wear, cracks, and damage, check the valve lifters for broken clips, worn Pushrod sockets, scuffed or worn lifter bodies, worn rollers, loose and broken pins, and plugged oil holes. When installing brand new lifters apply lubricant gm p/ n 12345501 (Canadian P/ N 992704) on the valve lifter rollers. If reusing lifters, make sure they are put back in their original positions. The valve lifter Pushrod guides are then installed as well as tightening the guide bolts to 16 nm (12 ft. Lbs), subsequently the installation of the valve rocker arms and pushrods, and lastly the prolongation of the lower Intake Manifold.

The right-side Lash Adjuster replacement procedure begins with Camshaft(s) removal followed by Rocker Arm removal. After lifting the adjusters from their positions you need to clean the Camshaft(s) and inspect both the Rocker Arm(s) and adjusters. Replace any faulty parts. The service requires starting with new adjuster installation which must be followed by Rocker Arm installation before reattaching each applicable Camshaft. The service requires correct tools for each step which includes the Camshaft removal tool (part number 12345), rocker arm removal tool (part number 67890), and Lash Adjuster removal tool (part number 11223) to work efficiently.

Starting the Lash Adjuster replacement requires complete removal of the Cylinder Head followed by extracting all lash adjusters and guides before removing guide bolts. After installing the new parts begin replacing the guides and guide bolts along with the new lash adjusters before reinstalling the Cylinder Head.

To change valve lifters first you would need to take off the Cylinder Head and gasket, also the valve lifter guide bolts. Next, pull out the valve lifters and guide, being mindful that some of the valve lifters, are stuck because of gum or varnish deposits; use valve lifter remover (J3049-A) or a similar tool if applicable. After taking the valve lifters out of the guide, order or label to insure proper reinserts. Remove and clean the valve lifters after they are removed then install them. In reusing valve lifters, be sure that they re installed to their original positions. Lubricate the outer surfaces of the valve lifters and the inner surfaces of the lifter guides with clean engine oil, lift the valve lifters and insert them with the flat part at the top into the flat part in the lifter guide bore and push part way into the bore until they will fit no further. Install the valve lifters and guide to the engine block followed by installing the valve lifter guide bolt that one should tighten to 12 nm( 106 inch lbs.). Finally, install the Cylinder Head and a gasket.

Start by uninstalling the left Rocker Arm cover before moving to remove the right Rocker Arm cover. After the upper Intake Manifold extraction you must remove the lower Intake Manifold. Start by removing the rocker arms and pushrods followed by the Lash Adjuster guide bolts and Lash Adjuster guide. Put the Lash Adjuster(s) in a separate container before you clean all gasket surfaces and valve train parts. Check both lash adjusters and cam lobe surfaces for wear patterns. After returning each Lash Adjuster to its native position install the Lash Adjuster guide(s) and bolts. Proceed through the following installation steps: reinsert rocker arms and pushrods, and then install lower Intake Manifold before final installation of upper Intake Manifold. Place the original Rocker Arm covers onto their designated positions: right and left respectively.

The Lash Adjuster replacement requires removing the valve Rocker Arm covers followed by upper and lower intake manifolds then the Rocker Arm bolts and guide plates. Start by unbolting and removing Rocker Arm bolts and valve rocker arms along with guide plates. Keep all valve train components in the correct order for future reinstallation. First remove the Pushrod(s) after removing Lash Adjuster guide retainer bolts, Lash Adjuster guides, and lash adjusters. Degrease all gasket surfaces before inspecting both the lash adjusters and cam lobe wear patterns. After prelubing with gm p/n 12345501 or equivalent prelube the lash adjusters you should place them in their original positions. Secure the Lash Adjuster guide(s) using Lash Adjuster guide retainer bolts at 30 nm (22 ft. Lbs.) torque. The replacement sequence includes Pushrod(s), guide plate(s), valve Rocker Arm(s), and bolt(s). Finally, lower and upper intake manifolds should be reinstalled. Reinstall all valve Rocker Arm covers into their original position.

In order to replace the valve lifters, first remove the Cylinder Head and gasket and then the valve lifter guide bolts. Then get out the valve lifters and guide, although, some of them might be stuck because of the gum or varnish deposits. If necessary, use the valve lifter remover (J 3049-A) to help remove the valve lifters. Once you remove the lifters from guide, sort or label the components for correct reassemble. Clean and inspect the valve lifters before installation. If reusing valve lifters, they are placed on their original position. Lubricate the valve lifters and engine block valve lifter bore with clean engine oil, then apply the lifters into the lifter guides with the flat portion on the top of the lifter matching the flat portion of the lifter guide bore and apply the lifter completely into the guide bore. Mount the valve lifters and guide onto the engine block and then the valve lifter guide bolt and tighten to 12 nm (106 inch lbs.). Last but not least, install the Cylinder Head and gasket.

Begin valve lifter replacement by removing the Intake Manifold along with pushrods before placing all components in a rack for correct reinstallation. After removing valves' lifter pushrod guide bolts you need to position valve lifters vertically in the rack to retain their oil content before lifting them out. When lifters get stuck because of gum or varnish buildup you should use the valve lifter remover (J 3049-A) tool to help them come out. Rinse the valve lifter bores with cleaning solvent then use a shop towel to clean them before inspecting for severe wear or scoring. Replace your engine block if necessary. Before finalizing check the Camshaft for damage and wear while removing it for better evaluation. After inspection, clean activated lifters if necessary. During new lifter installation add lubricant to the rollers while reinstalled lifters must remain in their initial setup. After tightening the guide bolts to 16 nm (12 ft. Lbs.) you can proceed to mount the pushrods and Intake Manifold. A new engine starts with a normal slight ticking noise during its initial startup period. The noise can be eliminated by increasing engine rpm slightly.

The l92 - first design Lash Adjuster (209, 219) replacement procedure starts with removing the Cylinder Head with gasket then continuing with the Lash Adjuster guide bolt (211) removal. Extract the Lash Adjuster guides (210) while removing their respective adjusters and record original placement because the guides require the notched area to match the block locating tab. Extract the lash adjusters from their guide position before cleaning them for inspection. Place reused adjusters back into their original positions during reinstallation with each of the 4 lash guide assemblies consisting of 2 active fuel management adjusters and 2 non-active fuel management adjusters. Run clean engine oil across lash adjusters and engine block Lash Adjuster bores before putting the adjusters into position by matching the flat areas on the non-active fuel management adjusters with flat zones in the adjuster guide bores and keeping active fuel management adjusters properly positioned by placing the guide notch next to the raised area. The lash adjusters along with guide (210) go into the engine block while Lash Adjuster guide bolts (211) must be tightened to 12 n.m (106 lb in). Put back the Cylinder Head and gasket afterward.

To remove the valve lifters, you will need to remove the Cylinder Head and gasket first and then remove valve lifter guide bolts, next the valve lifters and pivot. In the event that any valve lifters stick while in gum or varnish deposits, use the valve lifter remover (J 3049-A) to help to extract them. After removing the valve lifters, sort or sign the components for easy re-fixing and then clean and examine the valve lifters. When reinstalling, make sure the valve lifters are reinstalled in their original positions, before lubing them as well as the lifter guide bores on the engine block with a clean engine oil then inserting the lifters into the lifter guide, align the flat area at the top of the lifter to the flat area in the lifter guide bore. After that, install valve lifters and guide to the engine block, and then tighten the valve lifter guide bolt to 12 nm (106 inch lbs.) before installing the Cylinder Head and gasket.

Removing the Cylinder Head and gasket from both the right and left sides, you can replace the lash adjusters with the active fuel management. Then remove the Lash Adjuster guide bolts (211) and the Lash Adjuster guides (210) together with the adjusters remembering to mark the position the guides were installed in, relating the notched area with the locating tab of the engine block. Take off the lash adjusters (209, 219) of the guide (210) and if there is a need clean them and check them. When installing, rub the lash adjusters (209, 219) and the engine block Lash Adjuster bores with clean engine oil and then insert the adjusters to the guides, flat area of the side with an active fuel management adjuster all together with the guide part should be in agreement, a notched area should match with the raised section of the adjusters. Install the lash adjusters and guide (210) up to the engine block while taking necessary precautions on fasteners, and secure with Lash Adjuster guide bolts (211) at 12 nm (106 lb in). Lastly, reinstall the Cylinder Head and gasket on either side.

In order to change the Lash Adjuster, remove first the Cylinder Head and the gasket. For this process, utilize the j 3049-a Lash Adjuster remover. Second remove the Lash Adjuster and make sure you clean and check thoroughly. Install the new Lash Adjuster after inspection and install the Cylinder Head and gasket back.

To change the lash adjusters (209, 219) in the lh6, lmg, ly5, and l76 engines, remove the Cylinder Head and gasket. Then remove the Lash Adjuster guide bolts (211) and Lash Adjuster guides (210) along with Lash Adjuster, noting the installed position of the guides as the notched area needs to face locating tab on the engine block. Remove lash adjusters from the guide and arrange or mark the components for re-assembly at their original positions. Clean and scrutinize the lash adjusters if the need arises. When re-fitting, place clean oil on the lash adjusters and the engine block Lash Adjuster bores, then insert the adjusters into the guides making sure the flat area on the non-active fuel management adjuster is in the flat area in the guide bore and that the active fuel management adjusters are in the guides with the notch in the guide aligned with the raised install the lash adjusters and guide (210) to the engine block paying due attention to fastener precautions and secure with Lash Adjuster guide bolts (211) torqued to 12 nm (106 lb in). Lastly, install the Cylinder Head and gasket.

One needs to obtain the required tools to replace the valve lifters which can range from the therefore scaler, a screwdriver, etc. Valve lifter remover (J 3049-A). Start by removing the lower Intake Manifold and then the valve rocker arms and valve pushrods, taking care to have the parts placed into a rack to be reinstalled into the original location. Next, remove the bolts and guide for valve pushrods lifter while putting them upright on the rack to keep the oil in them. If any valve lifters are stuck due to gum or varnish deposits, use the valve lifter remover (J 3049-A) to help in the removal process. Clean the valve lifter bores using cleaning solvent and workshop towel, identify them for excessive wear/scoring and replace engine block accordingly. Also, check the wear on the cams shaft or damage on it, as marking, sorting and placing all the components for assembly. Clean the parts in cleaning solvent and wipe them with compressed air while at the same time inspect the valve lifter Pushrod guides for wear, cracks or damage. Check the valve lifters for any broken or damaged clips, worn Pushrod sockets, scuffed or worn lifter bodies, worn rollers, loose or damaged pins, and plugged oil holes. In the installation process, it is important to apply the lubricant gm p/n 12345501 (Canadian P/N 992704) or equal to the valve lifter rollers, and where the lifters are to be reused them, they should be installed in their original positions. Go ahead and install the valve lifter Pushrod guides tighten the bolts to 16 nm (12 ft. Lbs.) followed by the valve rocker arms and the pushrods and the lower Intake Manifold.

To replace the valve Rocker Arm and valve Lash Adjuster, remove the Camshaft cover and exhaust and the functions inlet sprocket bolts. Mount the Camshaft sprocket holding tool (J44222) onto the Cylinder Head, aligning the horizontal bolts into the Camshaft sprockets to ensure the proper tension of the chain and do not touch the driving chain components. Gently lift the sprockets with the timing chain off the camshafts and then remove the Camshaft cap bolts. Make sure that the Camshaft caps are put in a rack for an easy replacement. Then, remove the Camshaft caps, camshafts, valve rocker arms, and valve lash adjusters without losing track of their position for reassembly. Before installing lubricate and fill the valve lash adjusters with the engine oil. Make sure to lubricate the valve Rocker Arm roller and replace the valve rocker arms into their previous location; apply a coat of engine oil on the Camshaft journals and insert the camshafts. Replace the original Camshaft caps back onto the original journals and tighten the Camshaft cap bolts to 12 nm (106 inch lbs.). Gently reinstall the Camshaft sprockets to the camshafts and take the Camshaft sprocket holding tool (J 44222) off. Mount the intake Camshaft sprocket washer and bolt, then the exhaust Camshaft actuator bolt, and tighten the intake Camshaft sprocket bolt to 20 nm (15 ft. Lbs.), followed by 100 degrees with the torque angle meter (J 36660-A). Torque the exhaust Camshaft actuator bolt, 25 nm (18 ft. Lbs.) on the first pass, then additional 135 degrees on the final pass with the torque angle meter (J 36660-A). Finally, install the Camshaft cover.

Begin the valve lifter replacement after the Intake Manifold removal and the subsequent removal of valve rocker arms and pushrods. Begin by removing the valve lifter guide retainer bolts before you remove both the retainer and valve lifter guides. Before removing valve lifters you must mark and arrange them according to their original placement. When valve lifters become trapped in their bore by gum or varnish deposits you should employ the valve lifter remover (J 3049-A). During valve lifter inspection following cleaning operations you need to replace all lifters if installing a new Camshaft. Use gm U.S. P/N 12345501 lubricant or canadian P/N 992704 or an equivalent product to coat valve lifter rollers. For valve lifter reuse install them back into their original location while checking that the valve lifter guide retainer makes full contact with all guides before installing new guide retainers if any show bending. Replace the retainer because it shows bending. The first step is to lay down the valve lifters before setting the valve lifter guides directly over the flat portions of each valve lifter. This alignment step must have the valve lifter rollers pointing directly at the Camshaft lobes. Install the valve lifter guide retainer first before installing the guide retainer bolts with a torque of 25 nm (18 ft. Lbs.). Finally, put back the valve rocker arms and pushrods.

Replacement of lash adjusters (209, 219) in lh6, lmg, ly5 and l76 requires removal of both the Cylinder Head and gasket prior to continuation. First remove the Lash Adjuster guide bolts (211) with Lash Adjuster guides (210) and adjusters while recording guide positioning since the guide has a notched area that corresponds with the locating tab on the engine block. Move the lash adjusters from their position on the guide while carefully keeping the active fuel management adjuster's notched area in line with the guide's raised surface area. The components need to be organized for their original locations while the lash adjusters require cleaning and inspection for needed repairs. Clean engine oil should be used both to lubricate the lash adjusters and engine block Lash Adjuster bores before inserting the adjusters into their guides while maintaining correct alignments between the flat areas and notches. Install the lash adjusters with their guide (210) to the engine block before tightening the Lash Adjuster guide bolts (211) to 12 n.m (106 lb in). Seal the repair by reinstalling the Cylinder Head and gasket.

Start by dismantling the Cylinder Head while also extracting its gasket before handling Lash Adjuster replacement. Begin by removing the Lash Adjuster guide bolts (211) and follow by extracting the Lash Adjuster guides (210) which also remove the adjusters. Keep track of the guide positioning because their notched area needs to match the engine block's locating tab. After removing the lash adjusters (209) from the guide (210) you should organize or mark components for later reinstallation. Inspection of lash adjusters demands cleaning procedures. After application of engine oil, place and push the lash adjusters (209) into the adjuster guides (210) until complete insertion. The flat top areas of both parts must match the flat area of the bore during insertion. Follow fastener precautions when installing the engine block's lash adjusters and guide (210) assembly before torquing the guide bolts to 12 nm (106 lb in). Reinstall the Cylinder Head after you have installed the gasket.

Begin valve lifter replacement by removing the Intake Manifold along with pushrods before placing all components in a rack for correct reinstallation. After removing valves' lifter pushrod guide bolts you need to position valve lifters vertically in the rack to retain their oil content before lifting them out. When lifters get stuck because of gum or varnish buildup you should use the valve lifter remover (J 3049-A) tool to help them come out. Rinse the valve lifter bores with cleaning solvent then use a shop towel to clean them before inspecting for severe wear or scoring. Replace your engine block if necessary. Before finalizing check the Camshaft for damage and wear while removing it for better evaluation. After inspection, clean activated lifters if necessary. During new lifter installation add lubricant to the rollers while reinstalled lifters must remain in their initial setup. After tightening the guide bolts to 16 nm (12 ft. Lbs.) you can proceed to mount the pushrods and Intake Manifold. A new engine starts with a normal slight ticking noise during its initial startup period. The noise can be eliminated by increasing engine rpm slightly.

The replacement of lash adjusters (LH6, LMG, LY5, and L76) starts with removing the Cylinder Head along with its gasket and continuing to remove the Lash Adjuster guide bolts (211). When removing the Lash Adjuster guides (210) and adjusters maintain track of their initial installation position because the guides have notched alignment with the engine block's locating tab. The first step is to extract lash adjusters (209, 219) from guide (210) while orienting the notched guide area to match the raised adjuster side surface which determines active fuel management adjuster location. Mark or organize the components before their replacement in their original positions followed by necessary cleaning and inspection of lash adjusters. The process requires clean engine oil lubrication of new lash adjusters (209, 219) and engine block valve bores. The reinstallation step involves inserting adjusters into their guides where a flat area on non-active fuel management lash adjusters matches adjuster guide bore flat areas. Notch positions should align with active fuel management adjuster raised surfaces. Install the lash adjusters together with guides (210) onto the engine block and fasten them with Lash Adjuster guide bolts (211) to 12 n.m (106 lb in). Replace the Cylinder Head along with its gasket.

The process starts with removing both the Cylinder Head and gasket before proceeding with Lash Adjuster replacement. First remove the Lash Adjuster guide bolts (211) then extract the Lash Adjuster guides (210) and adjusters while carefully memorizing the original guide positioning because the notched section needs to align with the engine block's locating tab. Next proceed to extract lash adjusters (209) from guide (210) before marking or organizing replacement parts. The clean-up and inspection of lash adjusters should happen when needed. Reinstalling requires application of clean engine oil on both lash adjusters (209) and engine block Lash Adjuster bores before putting lash adjusters into lifter guides (210). When seating the lash adjusters, position the flat areas on the adjuster tops against the flat areas in the adjuster guide bores before pushing the adjusters fully into position. The engine block gets its lash adjusters and guide (210) installation following fastener caution rules while the guide bolts receive a 12 nm (106 lb in) torque specification. Reinstall the Cylinder Head while also installing the gasket.

Clean and inspect the valve lifters and guides before dipping the valve lifters in prelube (GM P/N 12345501 or equivalent).

Install the valve lifter guides and the valve lifter guide bolts, tightening them to 30 N.m (22 lb ft).

The rocker arms should be removed next.

Remove the lifters.

Dip the valve lifters in prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent.

Take out the valve guide retainer bolts and the valve guide retainer, then remove the valve lifter guides and the valve lifters.

Keep all valve train parts organized for reinstallation in their original locations and orientations.

Install the valve lifters and valve lifter guides, then reattach the valve guide retainer and secure it with the valve guide retainer bolts, tightening them to 30 Nm (22 ft. lbs.).

The lifters should be removed.

Begin by installing the lifters.

Finally, install the applicable camshaft(s).

Dip the valve lifters in prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent.

For installation, dip the valve lifters in prelude (GM P/N 12345501 or equivalent) and place them back in their original positions.

Remove the left camshafts.

Tighten the valve guide retainer bolts to 30 Nm (22 ft. lbs.).

Remove the rocker arms, pushrods, and pedestals, followed by the lower intake manifold and gaskets.

First, remove the applicable camshafts.

Clean and inspect the camshafts, rocker arms, and lifters, repairing or replacing them as necessary.

Coat the valve lifters with lubricant, GM P/N 12345501, Canada P/N 992704, or equivalent.

Clean and inspect the camshafts, rocker arms, and lifters, repairing or replacing them as necessary.

First, remove the cylinder head and gasket, followed by the valve lifter guide bolts.

Align the flat area on the top of the lifter with the flat area in the lifter guide bore, and push the lifter completely into the guide bore.

The rocker arms should be removed next.

Take out the valve lifter guide bolts and the valve lifter guides along with the lifters, noting the installed position of the guides.

The notched area of the guides must align with the locating tab on the engine block.

Align the flat area on the top of the lifter with the flat area in the lifter guide bore, and push the lifter completely into the guide bore.

Loosen the valve lifter guide bolts and remove the valve lifter guide.

Organize or mark the components for reinstallation in their original locations.

Install the cylinder head using the Valve Lifter Remover (J3049-A).

Install the valve lifters and guide to the engine block.

Reinstall the applicable camshafts with the Camshaft Installation Tool (part number).

Install the valve lifters and guide assembly (210) to the engine block, ensuring to follow the fastener notice.

Install the cylinder head using the J 3049-A Valve Lifter Remover.

Remove the valve lifters (209) from the guide (210) and organize or mark the components for reinstallation in their original locations.

Align the flat area on the top of the lifter with the flat area in the guide bore and push the lifter completely into the guide bore.

Install the new valve lifters along with the valve lifter guide.

Install the valve lifters and guide to the engine block.

Align the flat area on the top of the lifter with the flat area in the lifter guide bore and push the lifter completely into the guide bore.

Tighten the guide bolts to 16 Nm (12 ft. lbs.).

Align the flat area on the top of the lifter with the flat area in the guide bore and push the lifter completely into the guide bore.

Finally, install the cylinder head and gasket.

Reinstall the valve rocker arms, pushrods, and the lower intake manifold.

Coat the valve lifters with prelude (GM P/N 1052365 or equivalent).

Reinstall the valve rocker arms and pushrods, the lower intake manifold, and the valve rocker arm cover.

Take out the valve lifter guide bolts and the valve lifter guides before removing the valve lifters.

First, remove the valve rocker arm cover.

Reinstall the valve rocker arms and pushrods.

Also, inspect the camshaft for wear or damage, removing it for further inspection if needed.

First, remove the valve rocker arm cover.

Install the valve lifters and guide (210) to the engine block, following the fastener notice.

Place the valve train parts in a rack to maintain their original order.

Check the camshaft for wear or damage, and clean and inspect the lifters as needed.

Reinstall the valve lifters and guide to the engine block, then install the valve lifter guide bolt and tighten it to 12 Nm (106 inch lbs.).

Remove the valve lifters and guide, noting that some may be stuck due to gum or varnish deposits.

Next, remove the rocker arms.

Use the Valve Lifter Remover (J 3049-A) to assist in their removal.

Organize or mark the components for reinstallation in their original locations if necessary.

Clean and inspect the valve lifters.

Some lifters may be stuck due to gum or varnish deposits.

It is normal for new lifters to produce a slight ticking noise upon initial engine start, which should subside with a slight increase in RPM to raise oil pressure.

Install the cylinder head and gasket.

Install the cylinder head and gasket.

First, remove the cylinder head and gasket.

Install the valve lifters and guide to the engine block.

Remove the intake manifold and the pushrods, placing the components in a rack for proper reinstallation.

Install the valve lifters and guide to the engine block.

Inspect the camshaft for wear or damage, removing it for further inspection if needed.