Valve Clearance: Testing and Inspection

NOTE: This engine is an overhead cam engine with hydraulic lash adjusters. The valves are non adjustable, however the following procedure can be followed to check for the proper valve clearance.

1. Position camshaft so that the base circle of the lobe is facing the cam follower of the valve to be checked.

Checking Valve Lash Clearance:

2. Using Valve Spring Compressor T88T-6565-BH or equivalent, slowly apply pressure to the cam follower until the lash adjuster is completely collapsed. Hold follower in this position and insert the proper size feeler gauge between the base circle of the cam and the follower. The desired collapsed tappet gap is 0.040-0.050 and the allowable collapsed tappet gap is 0.035-0.055.
3. If the clearance is excessive, remove the cam follower and inspect for damage.
4. If the cam follower appears to be intact and not excessively worn, measure the valve spring assembled height to ensure the valve is not sticking.
5. If the valve spring assembled height is correct, check the dimensions of the cam shaft.
6. If the camshaft dimensions are allowable, remove, clean and test the lash adjuster.
7. Install the lash adjuster and check the clearance. Replace damaged or worn parts as necessary.