Hydraulic Tappets

 CAUTION: If any part of the tappet assembly needs replacing, replace the entire assembly.

The tappet assemblies should be kept in proper sequence so that they can be installed in their original position. Inspect and test each tappet separately so as not to intermix. If a tappet is worn, it is recommended that all tappets and camshaft be replaced.

Cleaning

Thoroughly clean all the parts in clean solvent and wipe them with a clean, lint-free cloth.  

Inspection

Inspect the parts and discard the entire lash adjuster, tappet assembly if any part shows pitting, scoring or excessive wear. Replace the entire assembly if the plunger is not free in the body. The plunger should drop to the bottom of the body by its own weight when assembled dry.

Assemble the lash adjuster, tappet assembly and check for freeness of operation by pressing down on the plunger. The lash adjusters, tappets can also be checked with a hydraulic tester to test the leakdown rate. Follow the instructions of the test unit manufacturer or the Hydraulic Tappet/Lash Adjuster, procedure under Diagnosis and Testing.

Flat Tappet Wear