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ENGINE
CYLINDER HEAD DISTORTION
• Decarbonize the combustion chambers.
• Check the gasketed surface of the cylinder head for distortion
with a straightedge and thickness gauge, taking a clearance
reading at several places indicated.
• If the largest reading at any position of the straightedge
exceeds the limit, replace the cylinder head.
~
Cylinder head distortion:
Service Limit: 0.20 mm (0.008 in)
1r%;t1
09900-20803: Thickness gauge
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VALVE STEM RUNOUT
• Support the valve using V-blocks and check its runout using
the dial gauge as shown.
• Ifthe runout exceeds the service limit, replace the valve.
~
Valve stem runout:
Service Limit: 0.05 mm (0.002 in)
lrThill
09900-20607: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block set (100 mm)
VALVE HEAD RADIAL RUNOUT
• Place the dial gauge at a right angle to the valve head face
and measure the valve head radial runout.
• If it measures more than the service limit, replace the valve.
~
Valve head radial runout:
Service Limit: 0.03 mm (0.001 in)
Igtl 09900-20607: Dial gauge (11100 mm)
09900·20701: Magnetic stand
09900-21304: V-block set (100 mm)
VALVE FACE WEAR
• Visually inspect each valve face for wear. Replace any valve
with an abnormally worn face. The thickness of the valve face
decreases as the face wears. Measure the valve face
CD.
If it
is out of specification, replace the valve with a new one.
~
Valve head thickness
CD:
Service Limit: 0.5 mm (0.02 in)
ITThill
09900·20102: Vernier calipers