ENGINE 3-41
• Pull out the valve from the other side.
• Remove the oil seals

6 and spring seats
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7.
#
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
Standard: 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
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)
Do not reuse the removed oil seals.
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