Service manual

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ENG
VALVES AND VALVE SPRINGS
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 replace the oil seal.
Valve stem runout
0.01 mm (0.0004 in)
EAS00240
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 cylin-
der head.
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a. Apply Mechanic’s blueing dye (Dykem)
b onto the valve face.
b. Install the valve into the cylinder head.
c. Press the valve through the valve guide
and onto the valve seat to make a clear
impression.
Valve seat width
Intake: 0.9 ~ 1.1 mm
(0.035 ~ 0.043 in)
<Limit>: 2.0 mm (0.079 in)
Exhaust: 0.9 ~ 1.1 mm
(0.035 ~ 0.043 in)
<Limit>: 2.0 mm (0.079 in)
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