Initial Inspection and Diagnostic Overview

CAUTION:
Overhaul/Replacement
If any part of the valve tappet (6500) needs replacing, replace the ENTIRE valve tappet. Internal tolerances for the valve tappets are very critical. Mixing components from different valve tappets may upset these tolerances, resulting in improper valve tappet operation and possible engine damage.

Reinstallation
Keep valve tappets in proper sequence so that they can be installed in their original position. Inspect and test each valve tappet to avoid a mix-up. If a valve tappet is worn, replace all valve tappets and camshaft.

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

Assemble the valve tappet and check for freeness of operation by pressing down on the plunger. The valve tappets can also be checked with a hydraulic Leakdown tester to test the Leakdown rate. Follow the instructions of the test unit manufacturer or the Leakdown Test procedure.

WEAR





Inspect flat valve tappet for flat or concave spots or scoring. If contact face is not convex and smooth check camshaft lobes for proper height or wear. Replace as required.