ENGINE 3-33
• Remove the oil seal 8 and spring seat 9.
• Remove the other valves in the same manner as described
previously.
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)
09900-20803: Thickness gauge
VALVE STEM RUNOUT
• Support the valve using V-blocks and check its runout using
the dial gauge as shown.
• If the runout exceeds the service limit, replace the valve.
Valve stem runout:
Service Limit: 0.05 mm (0.002 in)
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)
09900-20607: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block set (100 mm)
Do not reuse the removed oil seal.
Be careful not to damage the valve and valve stem
when handling it.
Be careful not to damage the valve and valve stem
when handling it.
SAMPLE
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