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VALVES AND VALVE SPRINGS
NOTE:
G
G
4 - 35
5. Measure:
Runout (valve stem)
G
Out of specification → Replace.
Runout limit:
0.01 mm (0.0004 in)
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
G
(from the valve face and valve seat)
7. Inspect:
Valve seats
G
Pitting/wear → Reface the valve seat.
8. Measure:
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)
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.
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