CYLINDER HEAD
90-828631R3 MARCH 1999 Page 4A-31
Valves
1. Clean the carbon deposits from the valve. Discard any cracked, warped, or burned
valves.
2. Measure the valve stem to check for wear. Replace valves if not in specification.
55810
a
Valve Stem Diameter “a”
Intake Valve 0.2156 - 0.2161 in.
(5.475 - 5.490 mm)
Exhaust Valve 0.2150 - 0.2156 in.
(5.460 - 5.475 mm)
3. Check the valve face for pitting. Valves faces that are pitted must be refaced.
NOTE: Several different types of equipment are available for refacing valves. Follow the
equipment manufacturer’s instructions.
IMPORTANT: Do not lap the valves.
4. Check the margin thickness of the valves after the valves have been ground. Any valve
with a margin thickness of less than the specification, should be replaced.
55809
45
°
a
Margin Thickness “a”
Intake Valve 0.020 - 0.035 in.
(0.5 - 0.9 mm)
Exhaust Valve 0.020 - 0.035 in.
(0.5 - 0.9 mm)
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