Engine distributors WSG-1068 - Valve Train Analysis - Static; Valve Train Analysis - Dynamic

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WSG-1068 GENERAL INFORMATION
Valve Train Analysis – Static
With engine off and valve cover removed, check for
damaged or severely worn parts and correct assembly.
Make sure correct parts are used with the static engine
analysis as follows.
Rocker Arm
 Check for loose mounting bolts, studs and nuts.
 Check for plugged oil feed in the rocker arms or
cylinder head.
Camshaft Roller Followers and Hydraulic Lash
Adjusters
 Check for loose mounting bolts on camshaft
carriers.
 Check for plugged oil feed in the camshaft roller
followers, hydraulic lash adjusters (HLA) or
cylinder heads.
Camshaft
 Check for broken or damaged parts.
 Check the bolts on the intake manifold.
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 valve
spring retainer.
Valve Spring Retainer Keys
 Check for proper seating on the valve stem.
Valves and Cylinder Head
 Check the head gasket for proper installation.
 Check for plugged oil drain back holes.
 Check for worn or damaged valve tips.
 Check for missing or damaged guide-mounted
valve stem seal.
 Check collapsed lash adjuster gap.
 Check installed valve spring height.
 Check for missing or worn valve spring seats.
 Check for plugged oil metering orifice in cylinder
head oil reservoir (if equipped).
Static checks (engine off) are to be made on the engine
prior to the dynamic procedure.
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 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 or load removed 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.
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 or load removed 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.