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VALVES AND VALVE SPRINGS
Valve spring
1. Measure:
2. Measure:
Valve seat
1. Measure:
Measurement steps:
Apply Mechanic's blueing dye (Dykem) b
G
to the valve face.
Install the valve into the cylinder head.
G
Press the valve through the valve guide
G
and onto the valve seat to make a clear
pattern.
Measure the valve seat width. Where the
G
valve seat and valve face made contact,
blueing will have been removed.
If the valve seat is too wide, too narrow, or
G
the seat is not centered, the valve seat
must be refaced.
4 - 18
Valve spring free length a
G
Out of specification → Replace.
Free length (valve spring):
Intake:
32.45 mm (1.28 in)
<Limit>: 26.9 mm (1.06 in)
Exhaust:
32.45 mm (1.28 in)
<Limit>: 26.9 mm (1.06 in)
Spring tilt a
G
Out of specification → Replace.
Spring tilt limit:
Intake:
2.5˚/1.4 mm (0.06 in)
Exhaust:
2.5˚/1.4 mm (0.06 in)
Valve seat width a
G
Out of specification → Reface the valve
seat.
Valve seat width:
Intake:
0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
<Limit>: 1.6 mm (0.0630 in)
Exhaust:
0.9 ~ 1.1 mm (0.0354 ~ 0.0433 in)
<Limit>: 1.6 mm (0.0630 in)
ENG
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