For 1990-2009 cars only
- Fill the stationary hydraulic lash adjuster (SHLA) with clean engine oil GM P/N United States 12345610 (Canadian P/N 993193) or equivalent. Take precautions to prevent scratching the pivot sphere area (1) of the SHLA.
- Lubricate the SHLA bores in the cylinder head with clean engine oil GM P/N United States 12345610, GM P/N Canada P/N 993193, or equivalent.
- Install the SHLAs in the cylinder head.
- Apply a liberal amount of lubricant GM P/N United States 12345501, GM P/N Canada 992704, or equivalent to the SHLA pivot spheres.
Notice: Ensure each valve lifter is filled with clean engine oil and the valve lifter does not tip over (plunger down) before the installation of the valve lifters. The loss of oil in the valve lifter lower pressure chamber or the dry stroking/cycling of the valve lifter plunger will allow air to travel into the high pressure chamber of the valve lifter. Air in the high pressure chamber of the valve lifter may not be purged causing extensive engine component damage.
