Valve Train Diagnosis

VALVE COVER REMOVED
Check for damaged and/or severely worn parts and correct assembly. Make sure the correct parts are used with the static engine analysis as follows.

CAMSHAFT ROLLER FOLLOWERS AND HYDRAULIC LASH ADJUSTERS, OVERHEAD CAMSHAFT
^ Check for loose mounting bolts on the camshaft carriers.
^ Check for plugged oil feed in the camshaft roller followers, hydraulic lash adjusters (HLA), or cylinder heads.

CAMSHAFT-OVERHEAD CAMSHAFT ENGINES
^ Check for broken or damaged parts.

VALVE SPRINGS
^ Check for broken or damaged parts.

VALVE SPRING RETAINER AND VALVE SPRING RETAINER KEYS
^ Check for proper seating of the valve spring retainer key on the valve stem and in the valve spring retainer.

POSITIVE ROTATOR AND VALVE SPRING RETAINER KEYS
^ Check for proper operation of the positive rotator.

VALVES AND CYLINDER HEAD
^ Check for plugged oil drain back holes.
^ Check for missing or damaged valve stem seals or guide mounted valve stem seals.
^ Check for plugged oil metering orifice in cylinder head oil reservoir.

If insufficient oiling is suspected, check the oil passages for blockage, then accelerate the engine to 1200 RPM with the transmission in NEUTRAL and the engine at normal operating temperature. Oil should spurt from the rocker arm oil holes such that valve tips and camshaft roller followers are well oiled. With the valve covers off, some oil splash may overshoot camshaft roller followers.