141
POWERHEAD
CYLINDER HEAD
7
If clearance exceeds service limit, replace valve
and/or valve guide.
If unable to measure valve guide inside diameter,
measure valve stem deflection as follows:
Install valve into valve guide.
Position the valve head at approximately 5 mm
away from valve seat.
Move valve head in the direction “X – Y” and
measure deflection with a dial indicator.
Valve stem deflection service limit:
•
IN 0.006 in. (0.14 mm)
•
EX 0.007 in. (0.18 mm)
If measurement exceeds service limit, replace
valve.
If measurement still exceeds service limit with
new valve, replace valve guide.
Inspect valve stem end face for pitting and wear. If
necessary, valve stem end may be resurfaced.
Use caution when resurfacing, do not grind away
stem end chamfer. When chamfer has been worn
away, replace valve.
Measure valve stem runout. If measurement
exceeds service limit, replace valve.
•
Service limit: 0.002 in. (0.05 mm)
Measure valve head radial runout. If measure-
ment exceeds service limit, replace valve.
•
Service limit: 0.003 in. (0.08 mm)
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