Cylinder Head Assembly: Testing and Inspection

VALVE TRAIN AND HEAD ASSEMBLY
The sound emitted from the overhead can indicate a valve train problem. Loose rocker levers will clatter. A squeaking noise can mean lack of lubrication for adjusting screw and the push rod socket.





CAUTION: If the one of the individual support pedestals is removed during inspection or repair, all head bolts must be retightened according to the head bolt torque sequence.





VALVE ADJUSTMENT - CHECK
Verify that the valves are adjusted correctly.

Valve Lash:

Intake 0.254 mm [0.010 in]
Exhaust 0.508 mm [0.020 in]





VALVE SEAL - WEAR
Worn valve seals are typically detected by blue smoke at idle or when the engine is unloaded and going down hill. Verify the condition by removing the valve spring and inspecting the seals.





Hardening of the material and wear or damage to the sealing surface will cause the seal to leak.





INJECTOR PROTRUSION
Injector protrusion can affect power from the engine. In addition to a single sealing washer (A) on the injector, the thickness (B) of the head gasket controls injector protrusion.





Oversize service head gaskets are used when the head surface on the block has been refaced. The head gasket is marked to indicate the thickness. One notch means the gasket is standard for use with blocks that have not been refaced.





Two notches identify that the gasket is for use with blocks that have been refaced 0.15 mm [0.006 inch]. The block should be marked with one X on the rear of the block to indicate the surface has been refaced 0.15 mm [0.006 inch].





Three notches indicate the gasket is for use with a block that has been refaced 0.50 mm [0.0197 inch]. Two XX's on the rear identifies a block has been refaced 0.50 mm [0.0197 inch] resurface.