VALVES AND VALVE SPRINGS
5-20
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3. Eliminate:
● Carbon deposits
(from the valve face and valve seat)
4. Check:
● Valve face
Pitting/wear → Grind the valve face.
● Valve stem end
Mushroom shape or diameter larger than the
body of the valve stem → Replace the valve.
5. Measure:
● Valve margin thickness “a”
Out of specification → Replace the valve.
6. Measure:
● Valve stem runout
Out of specification → Replace the valve.
NOTE:
● When installing a new valve, always replace
the valve guide.
● If the valve is removed or replaced, always re-
place the oil seal.
EAS24300
CHECKING THE VALVE SEATS
The following procedure applies to all of the
valves and valve seats.
1. Eliminate:
● Carbon deposits
(from the valve face and valve seat)
2. Check:
● Valve seat
Pitting/wear → Replace the cylinder head.
3. Measure:
● Valve seat width “a”
Out of specification → Replace the cylinder
head.
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a. Apply Mechanic’s blueing dye (Dykem) “b”
Valve margin thickness
Valve margin thickness D (intake)
0.60–0.80 mm (0.0236–0.0315 in)
Limit
0.5 mm (0.0197 in)
Valve margin thickness D (ex-
haust)
0.60–0.80 mm (0.0236–0.0315 in)
Limit
0.5 mm (0.0197 in)
Valve stem runout
Valve stem runout
0.040 mm (0.0016 in)
Valve seat width
Valve seat width C (intake)
0.90–1.10 mm (0.0354–0.0433 in)
Limit
1.6 mm (0.06 in)
Valve seat width C (exhaust)
0.90–1.10 mm (0.0354–0.0433 in)
Limit
1.6 mm (0.06 in)
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