Valve Train Analysis - Dynamic

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

ROCKER ARM
- Check for plugged oil feed in rocker arms or cylinder heads.
- Check for proper overhead valve train lubrication.

If insufficient oiling is suspected, accelerate the engine to 1200 rpm ± 100 rpm with the transaxle in NEUTRAL and the engine at normal operating temperature. Oil should spurt from the rocker arm oil holes so that valve tips and rocker arms are well oiled. With the valve covers off, oil splash may overshoot rocker arms. If oiling is insufficient for this to occur, check oil passages for blockage.

PUSH RODS
Check for bent push rod and restricted oil passage.

POSITIVE ROTATOR AND VALVE SPRING RETAINER KEYS
Check for proper operation of positive rotator (if equipped).

VALVES AND CYLINDER HEAD
Check for:
- plugged oil drain-back holes
- 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 transaxle in NEUTRAL and the engine at normal operating temperature. Oil should spurt from the rocker arm oil holes so that valve tips and rocker arms are well-oiled. With the valve covers off, some oil splash may overshoot rocker arms.