Valve Train Analysis - Dynamic

NOTE: Static checks (engine off) are to be made on the engine prior to the dynamic procedure.

Start the engine and, while idling, check for proper operation of all parts. Check the following:

ROCKER ARM
^ Check for plugged oil in the rocker arms or cylinder head.
^ Check for proper overhead valve train lubrication.

If insufficient oiling is suspected, accelerate the engine to 1200 rpm + 100 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 rocker arms are well oiled or, with the valve covers off, oil splash may overshoot the rocker arms. If oiling is insufficient for this to occur, check oil passages for blockage.

PUSH RODS
^ Check for bent push rods and restriction in oil passage.

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

If insufficient oiling is suspected, check 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 vain covers off, some oil splash may overshoot camshaft roller followers.