GM 12599650
Rocker Arms

People must remove the valve Rocker Arm cover first before arranging valve rocker arms pushrods and pivot support on a rack to maintain their original placement. You must begin by removing the valve Rocker Arm bolts before proceeding to remove the valve rocker arms and the pivot support together with the pushrods. Clean up the valve rocker arms then thoroughly inspect both these parts as well as the pushrods. Reinstallation requires clean engine oil for lubricating both valve rocker arms and pushrods while applying oil to the bolt flange of valve Rocker Arm bolts. After placing the valve Rocker Arm pivot support, verify that pushrods fit correctly within valve lifter sockets while also finding their position on the ends of the rocker arms before securing the Rocker Arm bolts. The Crankshaft should be rotated until the number one piston rests at top dead center (TDC) compression stroke while the Crankshaft sprocket key points toward the 1:30 position. Apply a torque of 30 nm (22ft.lbs.) to the valve Rocker Arm bolts for cylinders 1, 2, 7, 8 exhaust and cylinders 1, 3, 4, 5 intake when the engine reaches this specific position. You should start by rotating the Crankshaft completely before torqueing each bolt at 30 nm (22 ft. Lbs.) when installing the exhaust arm bolts for 3, 4, 5 and 6 while the intake arm bolts for 2, 6, 7 and 8 receive the same torque setting. The last task involves the installation of the valve Rocker Arm cover.

The initial step in working on a Rocker Arm assembly needs removal of the valve Rocker Arm cover. Start by removing the valve Rocker Arm followed by the valve push rod. Inspect the valve Rocker Arm before cleaning it together with the valve Pushrod. Install process requires positioning the valve Rocker Arm followed by the valve Pushrod then reinstall the valve Rocker Arm cover.

The first step for valve Rocker Arm and push rod replacement requires removal of the valve Rocker Arm cover. Ascertain the order of assembly by marking all components then remove the valve rocker arms while taking out their supports and afterward the valve pushrods. The parts chosen for reuse must receive clear identification marks before their correct organization. The cleaning solvent will be used to clean all components before using compressed air to dry them off. The contact surface of the valve Pushrod socket and the roller pivot and valve stem and bolt threads and valve Pushrod end contact surface should be checked for smoothness and wear. Examine valve Pushrod oil channels for any obstructions followed by inspections of the valve Pushrod termination surfaces and their end scoring state and straightness while you roll them across a flat plane. The valve rocker support components need to be inspected thoroughly for excessive damage. Reinstallation should start with organized parts then follow their original positions. Begin with valve Pushrod installation while maintaining the upward position of the valve Rocker Arm support arrow followed by valve Rocker Arm support assembly. The valve Pushrod socket and roller pivot and valve stem tip require application of prelube gm p/n 12345501 (Canadian P/N 992704 or its equivalent product). The installation of valve Rocker Arm assemblies begins with softening the nuts at points , , and before tightening the other bolts. Approach the crankshaft balancer to mount its alignment mark between 57-63 degrees facing either direction from the engine front cover alignment tab. The valve Rocker Arm assemblies demand no further valve lash adjustment following their correct torque application. Attach the valve Rocker Arm cover after torquing all valve Rocker Arm bolts to 30 nm (22 ft. Lbs.).

Marking all components for assembly starts the procedure that requires sorting and organizing before replacement of valve rocker arm and push rods. The first operation starts with removing the rocker arm cover followed by eliminating the rocker arms together with the rocker arm supports and pushrods. Verify the compatibility of the rocker arm sections as well as the pushrods before continuing. Reposition all components by placing them back exactly where they belonged when installation starts. The first step for installation should begin with pushrods followed by rocker arm supports and always orient the arrow on supports toward the upward direction. Pharmaceutical-grade lubricant GM P/N 12345501, (Canadian P/N 992704) or equivalent should be applied to the pushrod socket and roller pivot and valve stem tip. The first step for installing the rocker arms involves starting the bolts at positions and before tightening all the remaining bolts in accordance with Fastener Notice in Service Precautions. Rewind the crankshaft balancer until the crankshaft alignment mark spans 57 to 63 degrees in either direction from the engine front cover tab before securing all rocker arm bolts to 30 Nm (22 ft. lbs.). After solid installation and correct torques of the rocker arms no further adjustment of valve lash will be necessary. Polymer rockers should be placed before closing the valve train.

Start by removing the valve Rocker Arm cover before replacing the valve Rocker Arm along with push rods. Keep all components organized for future assembly operations while placing appropriate marks on them. After removing the valve rocker arms you should proceed to take out the Rocker Arm supports together with the valve pushrods while labeling components for reinstallation. Pass all components through cleaning solvent before using compressed air to dry them. Check the valve Pushrod socket contact area for smooth motion and wear near the contact surface together with the roller pivot for damage and binding situations while also verifying the valve stem contact surface and bolt thread conditions. The end surfaces of valve pushrods must undergo inspection for limitations in oil flow and end surface deterioration and bending through flat surface rolling activities. Temporarily check the valve rocker support to identify cases of excessive wear or damage. Installation procedures require parts maintenance of original locations while keeping a logical sequence for their assembly. Operating procedure starts with valve Pushrod installation where you need to align the valve Rocker Arm support arrow in an upward direction before adding the valve Rocker Arm supports. We need to apply prelube gm p/n 12345501 or its equivalent to all three components: the valve Pushrod socket and roller pivot and valve stem tip. Install the valve Rocker Arm assemblies by gently starting the bolts which should be at locations , , , and the remaining bolts. Adjust the crankshaft balancer until the alignment mark reaches 5763 degrees toward the clockwise or counterclockwise direction from the front cover alignment tab. After installing and correctly torquing the valve Rocker Arm assemblies you do not require any further adjustment of valve lash. Complete the procedure by fastening valve Rocker Arm bolts to 30 nm (22 ft. Lbs.) before reinstalling the valve Rocker Arm cover.

The first task when replacing valve rocker arms and push rods involves marking all components then sorting them by order before assembling them. The starting point consists of first taking off the rock arm cover then continuing to the rocker arms and both rocker arm supports and pushrods. It is essential to clean and inspect all rocker arms yet some pushrods require inspection or cleanup. Reinstallation should occur by keeping parts organized and placing them back into their original positions. Begin by installing pushrods with the attention to keep rocker arm support arrows oriented vertically before installing rocker arm supports. Use the correct part number from Sealers, Adhesives, and Lubricants to apply lubricant on the pushrod socket and the roller pivot and the valve stem tip. The first step for installing rocker arms includes using finger torque on bolts located at positions and , then working on the rest of the rocker arm bolts. The crankshaft balancer requires positioning of its alignment mark between 57-63 degrees from the engine front cover tab in a clockwise or counterclockwise direction. After installing rocker arms followed by proper torque application there is no necessity to adjust valve lash. Install the rocker arm cover after securing all rocker arm bolts to 30 Nm (22 ft. lbs.).

Before installing the valve rocker arm supports maintain an upwards position of the arrow on the valve rocker arm support. Apply prelube GM P/N 12345501 (Canadian P/N 992704) or equivalent to three main contact areas of valve rocker arms: valve pushrod socket , roller pivot , and valve stem tip . Start by installing the bolt at positions and before moving to and then continue with all valve rocker arm bolts. During this step proceed to position the number 1 cylinder at top dead center (TDC) compression stroke while keeping crankshaft balancer marks properly aligned with the front cover tabs. The installation requires proper fasteners to be used exactly where specified because replacement fasteners must match their specified part numbers. Use paint and lubricants or corrosion preventives only when directed because they may alter the clamping force and torque measurements. Correct fastener sequence along with tightening specifications must be followed to avoid damage to the components. The installed valve rocker arm assemblies require torque at 30 Nm (22 ft. lbs.) and subsequent valve lash adjustment will not be needed.

The replacement process of valve Rocker Arm and push rods begins by first removing the valve Rocker Arm cover and then marking, sorting, and organizing the components according to assembly needs. The first step requires extraction of valve rocker arms together with valve Rocker Arm supports and valve pushrods. Valuate the valve Rocker Arm together with the valve Pushrod for cleaning and inspection steps. Reassemble parts according to their original arrangement when putting the system back together. Begin with valve Pushrod installation while aligning the arrow on valve Rocker Arm supports upward and subsequently add valve Rocker Arm supports. Apply prelube gm p/n 12345501 or equivalent to all three components which are valve Pushrod socket , roller pivot along with valve stem tip. Begin bolting the piece at spots and and before and finally installing all other valve Rocker Arm fasteners. Position the exhaust crankshaft balancer so its alignment mark faces the front cover alignment tab but between 57-63 degrees clockwise or counterclockwise direction. The valve Rocker Arm assemblies need proper torquing for installation because no further adjustment of valve lash is necessary. After reinstallation place the valve Rocker Arm cover back before tightening bolts to 30 nm (22 ft. Lbs.).

The replacement process of valve rocker arms and push rods begins with marking and sorting all components for reassembly. Start the procedure by taking off the rocker arm cover followed by the rocker arms and then the rocker arm supports with pushrods. The process requires cleaning inspection of both rocker arms and pushrods subject to need. Part installation requires following an order for components while placing them back into their original positions. The first installation step involves installing pushrods while directing the arrow on rocker arm supports to face upward. Then continue with rocker arm supports installation. Seamaster premium multi-purpose lubricant should be applied to the pushrod socket and roller pivot and valve stem tip through the Sealers, Adhesives, and Lubricants part number. Install the rocker arms by starting the bolts at positions and while using fingers before securing all remaining bolts. Position the crankshaft balancer alignment mark at 57-63 degrees ahead or behind the engine front cover alignment tab as marked on the crankshaft balancer. No extra valve lash readjustment is necessary after the proper installation of the rocker arms along with their torquing procedures. After installation of the rocker arm bolts, tighten them to 30 N.m (22 lb ft) with a procedure of installing the rocker arm cover.

To fix and maintain the Rocker Arm assembly, begin with taking out the Rocker Arm cover. Continue by releasing the valve Rocker Arm and the valve Pushrod from their parts. Remove dust and grime from the valve Rocker Arm and Pushrod and inspect them both. Put the valve Pushrod and the valve Rocker Arm back into the correct location, then replace the cover.

Keep parts in order and reinstall them in their original locations.

Next, take out the valve rocker arms, valve rocker arm supports, and valve pushrods.

Ensure parts are reinstalled in their original locations.

Apply lubricant to the pushrod socket, roller pivot, and valve stem tip.

Rotate the crankshaft 360 degrees and then tighten the valve rocker arm bolts for cylinders 3, 4, 5, and 6 exhaust to 30 Nm (22 ft. lbs.) and for cylinders 2, 6, 7, and 8 intake to 30 Nm (22 ft. lbs.).

Inspect the valve rocker support for excessive wear or damage.

Clean and inspect all parts.

Take out the valve rocker arm and the valve pushrod.

Install the valve rocker arm pivot support, ensuring the pushrods seat properly in the valve lifter sockets and at the ends of the rocker arms without tightening the rocker arm bolts yet.

Place the valve pushrods and valve rocker arms back in position, adjust the valve lash, and finally, install the valve rocker arm covers.

Begin by removing the rocker arm cover and placing the rocker arms, pushrods, and pivot support in a rack to maintain their original positions.

First, remove the valve rocker arm cover.

Clean and inspect the rocker arms or pushrods as necessary.

Install the rocker arm pivot support, ensuring the pushrods seat properly in the valve lifter sockets, followed by the pushrods, then the rocker arms and bolts.

First, mark, sort, and organize all components for assembly.