CYLINDER HEAD, CYLINDER AND PISTON 6-13
CYLINDER HEAD DISTORTION
• Decarbonize the combustion chamber.
• Check the gasket 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: 0.05 mm (0.002 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 (IN. & EX.):
Service Limit: 0.05 mm (0.002 in)
# 09900-20607: Dial gauge (1/100, 10 mm)
09900-20701: Magnetic stand
09900-21304: V-block (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 (IN. & EX.):
Service Limit: 0.03 mm (0.001 in)
# 09900-20607: Dial gauge (1/100, 10 mm)
09900-20701: Magnetic stand
09900-21304: V-block (100 mm)
VALVE STEM AND VALVE FACE WEAR CONDITION
• Visually inspect each valve stem and valve face for wear and
pitting.
• If it is worn or damaged, replace the valve with a new one.
CAUTION
Be careful not to damage the valve head and valve
stem when handling it.
CAUTION
Be careful not to damage the valve head and valve
stem when handling it.
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