ENGINE 3-25
INSPECTION
CYLINDER HEAD DISTORTION
Check for distortion of the mating surface diagonally with a straight-
edge and thickness gauge as shown.
If distortion exceeds the service limit, repair or replace the cylin-
der head.
# Cylinder head distortion: Service Limit: 0.05 mm
! 09900-20803: Thickness gauge
VALVE HEAD RADIAL RUNOUT
Place a dial gauge as shown and measure valve head radial
runout.
If the service limit is exceeded, replace the valve.
# Valve head radial runout: Service Limit: 0.03 mm
! 09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block (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 de-
creases as the face wears. Measure the valve head T. If it is out
of specification replace the valve with a new one.
# Valve head thickness T: Service Limit: 0.5 mm
! 09900-20102: Vernier calipers
VALVE STEM END CONDITION
Inspect the valve stem end face for pitting and wear. If pitting or
wear is present, resurface the valve stem end. Make sure that the
length 1 is not less than the service limit. If this length becomes
less than the service limit, replace the valve.
# Valve stem end length:
Service Limit (IN & EX): 2.2 mm
VALVE STEM RUNOUT
Check the valve stem for abnormal wear or bend.
Place the valve on V-blocks and measure runout.
If the service limit is exceeded or abnormal condition exists, re-
place the valve.
# Valve stem runout: Service Limit: 0.05 mm
! 09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block (100 mm)
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