10-22
CAM PULLEY/CRANKSHAFT/ PISTON/CYLINDER HRX217HYA • HRX217HZA
VALVE GUIDE I.D.
Measure and record valve guide I.D.
If the measured valve guide I.D. is more than the service limit,
replace the cylinder.
GUIDE-TO-STEM CLEARANCE
Subtract each valve stem O.D. from the corresponding guide I.D.
to obtain the guide-to-stem clearance.
If the calculated clearance is more than the service limit, replace
the valve and the cylinder.
VALVE SEAT WIDTH
Remove the carbon deposits from the combustion chamber
(P. 3 - 1 0
).
Inspect each valve for face irregularities.
If necessary, replace the valve.
Apply a light coat of Prussian Blue or erasable felt-tipped marker
ink to each valve seat.
Insert the valve, and snap it closed against its seat several times.
Be sure the valve does not rotate on the seat.
The transferred marking compound will show any area of the valve
face that is not concentric.
Measure the valve seat width of the cylinder head.
If the measurement is more than the service limit, recondition the
valve seat (P. 1 0- 2 3
).
Check whether the valve seat contact area of the valve is too high.
If the valve seat is too high or too low, recondition the valve seat
(P. 10-23
).
STANDARD: IN: 5.500 – 5.512 mm (0.2165 – 0.2170 in)
EX: 5.540 – 5.552 mm (0.2181 – 0.2186 in)
SERVICE LIMIT: IN: 5.572 mm (0.2194 in)
EX: 5.612 mm (0.2209 in)
STANDARD:
IN: 0.020 – 0.047 mm (0.0008 – 0.0019 in)
EX:0.060 – 0.087 mm (0.0024 – 0.0034 in)
SERVICE LIMIT:
IN: 0.10 mm (0.004 in)
EX:0.12 mm (0.005 in)
STANDARD: 0.7 – 0.9 mm (0.03 – 0.04 in)
SERVICE LIMIT: 1.8 mm (0.07 in)
VALVE SEAT
WIDTH
VALVE SEAT
TOO HIGH
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