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VALVES AND VALVE SPRINGS
4-27
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.
Margin thickness:
Intake:
0.4 ~ 0.8 mm
(0.0157 ~ 0.0315 in)
Exhaust:
0.8 ~ 1.2 mm
(0.0315 ~ 0.0472 in)
5. Measure:
• Runout (valve stem)
Out of specification → Replace.
Runout limit:
0.01 mm (0.0004 in)
TIP
• When installing a new valve always replace
the guide.
• If the valve is removed or replaced always
replace the oil seal.
6. Eliminate:
• Carbon deposits
(from the valve face and valve seat)
7. Inspect:
• Valve seats
Pitting/wear → Reface the valve seat.
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