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Valve seat width
Valve seat width C (intake)
0.90–1.10 mm (0.0354–0.0433
in)
Valve seat width C (exhaust)
0.90–1.10 mm (0.0354–0.0433
in)
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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.
d. Measure the valve seat width.
NOTE:
Where the valve seat and valve face contacted
one another, the blueing will have been
removed.
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4. Lap:
• Valve face
• Valve seat
NOTE:
After replacing the cylinder head or replacing
the valve and valve guide, the valve seat and
valve face should be lapped.
VALVES AND VALVE SPRINGS
ECA4C81012
CAUTION:
This model uses titanium intake valves.
Titanium valves that have been used to lap
the valve seats must not be used. Always
replace lapped valves with new valves.
NOTE:
• When replacing the cylinder head, replace
the valves without lapping the valve seats
and valve faces.
• When replacing the valves or valves guides,
use new valves to lap the valve seats, and
then replace them with new valves.
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a. Apply a coarse lapping compound "a" to
the valve face.
ECA13790
CAUTION:
Do not let the lapping compound enter the
gap between the valve stem and the valve
guide.
b. Apply molybdenum disulfide oil onto the
valve stem.
c. Install the valve into the cylinder head.
d. Turn the valve until the valve face and valve
seat are evenly polished, then clean off all
of the lapping compound.
NOTE:
For the best lapping results, lightly tap the
valve seat while rotating the valve back and
forth between your hands.
5-26
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