6. CYLINDER HEAD/VALVES
VALVE /VALVE GUIDE
Inspect each valve for bending, burning,
scratches or abnormal stem wear.
Check valve movement in the guide.
Measure each valve stem O.D.
Service Limits:
IN 5.27mm replace if below
EX 5.27mm replace if below
Ream the guides to remove any carbon
build-up using a valve guide reamer.
Special Tool
Valve Guide Reamer
Measure each valve guide I.D.
Service Limits: IN: 5.485mm replace if over
EX: 5.485mm replace if over
Subtract each valve stem O.D. from the
corresponding guide I.D. to obtain the
stem-to-guide clearance.
Service Limits: IN: 0.035mm
EX: 0.055mm
VALVE GUIDE REPLACEMENT
Drive out the old valve guides with the valve
guide driver.
Special Tool
Valve Guide Driver
the service limits, replace the guides.
• Reface the valve seats whenever the
valve guides are replaced.
clockwise and do not insert or remove it
straight when it is stopped.
guides before driving them out.
• Drive the guides out vertically.
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