GM 12612273
Camshaft

To replace the Camshaft (except RPOs LC9, LMG, LY2, LY5) one must begin by removing the radiator support followed by the valve lifters before removing the engine front cover and Starter motor. Install the j 42386-a (Flywheel Holding Tool) so its teeth interlock with the engine Flywheel teeth before using one m10-1.5 x 120 mm and one m10-1.5 x 45 mm bolt to bolt the j 42386-a and secure both bolts at 50 nm (37 lb ft). Use the crankshaft sprocket to rotate until both alignment marks between the cmp actuator and the crankshaft sprocket become perfectly lined up. Disconnect and remove the cmp actuator solenoid valve (234) before removing the cmp actuator (235) as well as the Timing Chain (208). Unscrew the bolts (204) along with the retainer (203) of the Camshaft while watching out for Camshaft bearing damage. Unscrew the Camshaft sprocket bolt through the front bolt hole of the Camshaft and employ the bolt as a tool for cautious Camshaft extraction from the engine. Clean engine oil serves to lubricate the Camshaft journals and bearings before you should use the bolt to handle the Camshaft duringinstallation into the engine block. First tidy the gasket surface of the engine block before installing the Camshaft retainer (203) together with bolts (204). Tighten hex head bolts of the first design to 25 nm (18 lb ft) and torx® head bolts of the second design to 15 nm (11 lb ft). Install en 46330 (Timing Belt Tensioner Retaining Pin) by compressing the Timing Chain tensioner guide while keeping cmp actuator and Timing Chain in proper alignment. The installation of cmp actuator solenoid valve (234) requires light hand tightening before assessing sprocket alignment. The cmp actuator solenoid valve needs first tightening to 65 nm (48 lb ft) then a single pass to a 90-degree angle by using the j 45059 (Angle Meter). During this procedure, remove the en 46330. First remove the j 42386-a and bolts before restating the Starter motor and engine front cover with valve lifters before finishing with the radiator support.

An engineer needs en 46330 timing belt tensioner retaining pin (EN 46330) and j 42386-a Flywheel holding tool (J 42386-A) and j 45059 angle meter (J 45059) to replace rpos ly6/l76/l92 camshafts. The replacement requires these specific tools: en 46330 timing belt tensioner retaining pin (EN 46330), j 42386-a Flywheel holding tool (J 42386-A), and j 45059 angle meter (J 45059). Begin the process by taking away the radiator support followed by the valve lifters and engine front cover and Starter motor. Install the j 42386-a meshed with the Flywheel teeth before applying one m10-1.5 x 120 mm and one m10-1.5 x 45 mm bolt which require a 50 n.m (37 lb ft) torque setting. Align the crankshaft sprocket with Camshaft position (CMP) actuator alignment mark and crankshaft sprocket alignment mark by rotating the crankshaft sprocket. Start by removing the cmp actuator solenoid valve (234) while you remove both the cmp actuator (235) and Timing Chain (208). When removing the Camshaft retainer bolts (204) together with retainer (203) approach the Camshaft bearings with extreme caution to prevent damage. Drop the Camshaft sprocket bolt into the front bolt hole to use it as an aid during Camshaft removal from the engine block. Use a bolt to handle the Camshaft while you apply clean engine oil to both Camshaft journals and bearings before reinstallation. Use a clean engine block gasket surface before putting the Camshaft retainer (203) with bolts (204) in place and tightening hex head bolts first to 25 n.m (18 lb ft) and torx(R) head bolts second to 15 n.m (11 lb ft). Install en 46330 by compressing its Timing Chain tensioner guide. Place the cmp actuator correctly onto the Camshaft locating pin where the sprocket teeth connect with Timing Chain teeth while maintaining the sprocket alignment marks in the correct position. Install cmp actuator (235) and Timing Chain (208) at the appropriate positioning where the locating pin receives proper alignment. Regular inspection must confirm the Timing Chain stays within the engine block's front face boundary. Fasten a brand-new cmp actuator solenoid valve (234) by hand to its appropriate torque. Check that the sprockets show correct alignment before taking out the en 46330. Crank the cmp actuator solenoid valve to 65 n.m torque (48 lb ft) then continue with a 90 degree torque final pass using j 45059. Before reassembly of the vehicle replace both the j 42386-a and its bolts and put back the Starter motor along with the engine front cover and valve lifters and radiator support.

The necessary tools to replace the Camshaft in rpos ly6, l76, and l92 (6.0L and 6.2L) vehicles include en 46330 timing belt tensioner retaining pin (EN 46330), j 42386-a Flywheel holding tool (J 42386-A), and j 45059 angle meter (J 45059). Start the procedure by taking off the radiator support together with valve lifters followed by the engine front cover and Starter motor while ensuring j 42386-a fits correctly into the engine Flywheel. Apply the j 42386-a along with its two bolts as follows: m10-1.5 x 120 mm and m10-1.5 x 45 mm and tighten to 50 n.m (37 lb ft). Angle the crankshaft sprocket until you see both the alignment marks of the Camshaft position actuator line up with the marks on the crankshaft sprocket. First remove the cmp actuator solenoid valve (234) from its place before taking out the cmp actuator (235) together with Timing Chain (208). Use extreme caution when removing the Camshaft retainer bolts (204) because contact to the Camshaft bearings should be avoided. Also remove the retainer (203) from the bolts. The Camshaft sprocket bolt serves as a tool for installation of the Camshaft into the engine block which must be lubricated before placement with clean engine oil. When installing Camshaft retainer (203) with bolts (204), tighten first design hex head bolts to 25 n.m (18 lb ft) and second design torx head bolts to 15 n.m (11 lb ft). First compress the Timing Chain tensioner guide before you put in en 46330 while making sure the cmp actuator and Timing Chain maintain proper alignment. Attend to the cmp actuator solenoid valve (234) installation by starting with a torque of 65 n.m (48 lb ft) followed by a 90-degree torque with j 45059. The last step entails both removal of the j 42386-a and its related bolts before reinstalling the Starter motor together with the engine front cover and valve lifters and radiator support.

The Camshaft replacement requires starting with Radiator and A/C Condenser extraction along with lifter and Timing Chain and Camshaft sprocket elimination followed by balance shaft drive gear removal. First you must remove both Camshaft retainer bolts and retainer while carefully handling the Camshaft to prevent damage to the Camshaft bearings because all Camshaft journals share the same diameter. The front bolt holes receive three 5/16-18 x 4.0 inch bolts to serve as handles during Camshaft extraction by rotating and pulling out the Camshaft. Preliminary bolt removal from the system enables subsequent examination and cleaning of the Camshaft along with bearings if necessary. Installation of a new Camshaft requires engine oil replacement alongside the filter change along with the addition of engine oil supplement to the oil reservoir. Proper lubricant must be applied to the engine Camshaft lobes and bearing journals and Camshaft bearings. Select three bolts to use as a handle for engine Camshaft installation and afterward remove these bolts while applying threadlocker to reused fasteners when possible. Screw in the Camshaft retainer bolts until they achieve a torque of 12 n.m (106 lb in), then add the balance shaft drive gear, timing chain, Camshaft sprocket, lifters, a/c condenser and finish with the Radiator installation.

Beginning a Camshaft replacement for rpos lc9/lmg/ly2/ly5 (4.8L and 5.3L) requires removal of the radiator support followed by removal of valve lifters alongside their replacement before proceeding. You must detach both the Starter motor and the engine front cover. Apply the j 42386-a (Flywheel Holding Tool) along with two m10-1.5 x 120 mm and m10-1.5 x 45 mm bolts while applying torque reaching 50 n.m (37 lb ft). Follow this step by carefully rotating the crankshaft sprocket to line up its alignment marks with the one on the Camshaft sprocket before you remove the Timing Chain since any movement of the crankshaft system must be prevented. The procedure requires removing bolt 206 from the Camshaft sprocket followed by removing components 205 and 208 then proceeding with bolts 204 and retainer 203. Take special caution when handling the Camshaft to protect the Camshaft bearings from harm. Apply clean oil to both bearing surfaces of the Camshaft before putting it into the engine block through the use of the Camshaft sprocket bolt as an installation tool. The first clean the gasket surface of the engine block before installing the Camshaft retainer (203) along with its bolts (204). Use 11 lb ft of torque for the torx(R) head bolts and 18 lb ft for first design hex head bolts during installation. Install the en 46330 (Timing Belt Tensioner Retaining Pin) by compressing the Timing Chain tensioner guide and properly position the Camshaft sprocket with the timing mark facing the 6 o'clock setting. Place the Camshaft sprocket (205), timing chain (208) and bolt (206) while inspecting the sprocket alignment. Use the en 46330 to remove the sprocket bolt retainer after which apply 90 n.m (66 lb ft) torque then proceed with an additional 40-degree torque rotation using j 45059 (Angle Meter). Reinstall the Starter motor after removing the j 42386-a (Flywheel Holding Tool) and bolts and then install the engine front cover and valve lifters and wind up with the radiator support.

Install the camshaft sprocket bolt into the camshaft front bolt hole, then use it as a handle to carefully rotate and remove the camshaft from the engine block before removing the bolt.