INSPECTION AND REPAIR
5-22
ENG
VALVES AND VALVE GUIDES
1. Measure:
•
Clearance between stem and guide
Clearance between stem and guide =
Internal diameter of valve guide (a) –
Diameter of valve stem (b)
Out of specification ➔ Replace valve guide.
Clearance between stem and guide:
Intake: 0.010 ~ 0.037 mm
<Limit>: 0.08 mm
Exhaust: 0.030 ~ 0.057 mm
<Limit>: 0.10 mm
(1) Bore gauge
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Replacement steps:
NOTE:
Heat the cylinder head in an oven at 100°C to
facilitate the removal and installation of the guides
and to maintain correct locking interference.
•
Remove the valve guide using the special
punch (1).
•
Install the new guide using the special instal-
lation tool (2).
•
After installing the valve guide, bore with spe-
cial tool (3) to obtain valve-guide free play.
Valve guide remover (7 mm):
P/N. 90890-01225
Valve guide installer:
P/N. 90890-04017
Valve guide reamer (7 mm):
P/N. 90890-01227
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