Service manual

VALVES AND VALVE SPRINGS
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.
Valve seat width
Intake: 0.9 ~ 1.1 mm (0.0354 ~
0.0433 in)
<Limit>: 1.6 mm(0.063 in)
Exhaust: 0.9 ~1.1 mm
(0.0354~0.0433 in)
<Limit>: 1.6 mm(0.063 in)
TTTTTTTTTTTTTTTTTTTTTTT
a.
b.
c.
d.
Apply Mechanic’s blueing dye (Dykem) b
onto the valve face.
Install the valve into the cylinder head.
Press the valve through the valve guide and
onto the valve seat to make a clear impres-
sion.
Measure the valve seat width.
NOTE:
Where the valve seat and valve face contacted
one another, the blueing will have been removed.
•••••••••••••••••••••••
4. Lap:
8valve face
8valve seat
NOTE:
After replacing the cylinder head or replacing
the valve and valve guide, the valve seat and
valve face should be lapped.
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