GM 12698946
Valve Lifters

In order to change the lash adjusters on the left, you need to remove the specific Camshaft(s), taking out the rocker arms, and further the adjusters as well. Clean and inspect Camshaft(s), Rocker Arm(s), and adjuster(s) repairing or replacing as required. For installation purposes, start with an installation of the adjusters, next an installation of the rocker arms, and lastly, an installation of the desired Camshaft(s). Make sure that you have followed the procedures concerning cleaning and the inspection of the Camshaft and lash adjusters and using the necessary tools as required.

The replacement process for lash adjusters (209) starts with removing the Cylinder Head and gasket in all vehicles unless their rpos match lc9, lh6, lmg, lme or ly5. Before adjuster removal begin by removing Lash Adjuster guide bolts (211) and Lash Adjuster guides (210) together with adjusters (209) while remembering the original guide positioning since it needs to match the block's locating tab. Organization or make marks on all components which will help the reinstallation process to their original positions if needed. Check and clean the lash adjusters according to their state. During installation apply engine oil to both the adjusters (209) and the engineered block Lash Adjuster bore holes before inserting the adjusters into the guides (210) until they reach the bore completely. Align the flat areas on the adjusters with corresponding flats in the guide bore holes. Align the flat area on the lash adjusters (209) with the corresponding flat area in adjuster guide (210) features of the engine block. Then completely push the adjusters into the guide before securing them to the block using recommended torque settings of 12 nm (106 lb in). After completion install the Cylinder Head together with the gasket.

To replace the valve lifters, first, one should collect the tools: valve lifter remover (J 3049-A). Start by taking off the Intake Manifold and the pushrods while ensuring that the components are seated in a rack to ensure retention for reassembly. Next, unscrew the bolts and the lifter pushrod guide and position the valve lifters in rack upright so that the oil will remain inside. If there are any stuck valve lifters because of gum or varnish deposit in it, use valve lifter remover (J 3049-A) to remove them. Clean the valve lifter bores with a cleaning solvent and shop towel and check them for excessive wear or scoring which may require replacing the engine block. Also inspect the Camshaft for wear or damage removing the Camshaft for further inspection if needed. Replace the lifters as necessary. When re-installing new lifters, apply lubricant to the lifter rollers, and if using lifters for parts that they were used in initially, they were used in their original positions. Go on to install the lifters, then the lifter pushrod guides, ensuring the bolts are torqued to 16 n.m (12 lb ft), then install the pushrods and lastly the Intake Manifold. In new lifters, it is typical for engines to generate a little ticking sound when starting it for the first time; there should be some noise-lessening after slightly increasing the engine rpm to increase oil pressure.

Clean and inspect them, repairing or replacing as necessary.

Carefully reposition them onto the camshafts and remove the Camshaft Sprocket Holding Tool (J 44222).

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

Remove the valve lifter guide bolts.

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

Take out the valve lifter guides (210) along with the lifters, noting their installed position.

Install the lifters, followed by the lifter pushrod guides, tightening the bolts to 16 N.m (12 lb ft), then install the pushrods and finally the intake manifold.

Tighten the valve lifter guide bolts to 12 Nm (106 lb in).

Install the lifters, then the lifter pushrod guides, tightening the bolts to 16 Nm (12 lb ft), followed by the pushrods and finally the intake manifold.

Next, take out the valve lifter guide bolts (211) and the valve lifter guides (210) along with the lifters, ensuring to note the installed position of the guides, aligning the notched area with the locating tab on the engine block.

Remove the valve lifter guide bolts (211).

Reinstall the cylinder head and gasket.

Install the lifters, then the lifter pushrod guides, tightening the bolts to 16 Nm (12 lb ft), followed by the pushrods and finally the intake manifold.

Organize or mark the components for reinstallation and clean and inspect the valve lifters as necessary.

Reinstall the cylinder head and gasket.

Organize or mark the components for reinstallation in their original locations, and clean and inspect the valve lifters as necessary.

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