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VALVES AND VALVE SPRINGS
2. Replace:
• Valve guide
Replacement steps:
To ease guide removal, installation and to
maintain correct fit heat the cylinder head in an
over to 100 °C (212 °F).
a. Remove the valve guide using a valve guide
remover "1".
b. Install the new valve guide using a valve
guide remover "1" and valve guide installer
"2".
c. After installing the valve guide, bore the
valve guide using a valve guide reamer "3"
to obtain proper stem-to-guide clearance.
After replacing the valve guide reface the valve
seat.
3. Inspect:
• Valve face
Pitting/wear → Grind the face.
• Valve stem end
Mushroom shape or diameter larger than
the body of the stem → Replace.
4. Measure:
• Margin thickness "a"
Out of specification → Replace.
Valve guide installation height "a":
Intake:
15.1–15.5 mm (0.59–0.61 in)
Exhaust:
12.2–12.6 mm (0.48–0.50in)
Valve guide remover & installer set
(ø5.5):
90890-04016
Valve guide remover (5.5 mm):
YM-01122
Valve guide installer (5.5 mm):
YM-04015
Valve guide reamer (5.5 mm):
YM-01196
Margin thickness:
Intake:
1.3 mm (0.051 in)
Exhaust:
1.0 mm (0.039 in)