Checking The Valve Seats - Yamaha XVZ13TF 1999 Service Manual

VALVES AND VALVE SPRINGS
5. Measure:
S valve margin thickness a
6. Measure:
S valve stem runout
NOTE:
S When installing a new valve, always replace
the valve guide.
S If the valve is removed or replaced, always re-
place the oil seal.
EAS00240

CHECKING THE VALVE SEATS

The following procedure applies to all of the
valves and valve seats.
1. Eliminate:
S carbon deposits
2. Check:
S valve seat
3. Measure:
S valve seat width a
a. Apply Mechanic's blueing dye (Dykem) b
b. Install the valve into the cylinder head.
c. Press the valve through the valve guide and
d. Measure the valve seat width. Where the
4-30
Out of specification ! Replace the valve.
Valve margin thickness
1.15 X 1.45 mm
<Limit>: 0.7 mm
Out of specification ! Replace the valve.
Valve stem runout
<Limit>: 0.01 mm
(from the valve face and valve seat)
Pitting/wear ! Replace the cylinder head.
Out of specification ! Replace the cylinder
head.
Valve seat width
Intake: 0.9 X 1.1 mm
<Limit>: 1.4 mm
Exhaust: 0.9 X 1.1 mm
<Limit>: 1.4 mm
onto the valve face.
onto the valve seat to make a clear pattern.
valve seat and valve face contacted one
another, the blueing will have been removed.
ENG