Cylinder Head, Camshaft, and Valve Mechanism Repair
600 SRM 496
1.
CYLINDER HEAD
2.
RETAINING RING
3.
VALVE GUIDE
Figure 13. Valve Guide Inspection
Valve Seats
1.
Inspect condition of valve seats. If valve seats
have cracks, cylinder head must be replaced.
2.
If valve seats are in good condition, check contact
pattern of valve and valve seat. Use valve seat
grinder to make sure valve seats are within spec-
ifications shown in Figure 14. Use valve com-
pound to make sure valves fit seats.
A. EXHAUST
B. INTAKE
1.
VALVE SEAT
WIDTH
2.
EXHAUST VALVE
SEAT
3.
INTAKE VALVE
SEAT
Figure 14. Valve Seat Specifications
Valves
1.
Inspect stem of each valve for wear. Use microm-
eter to measure outside diameter of stem. See
Figure 15.
Minimum
dimension
for
intake
valve
is
7.980 mm (0.3142 in.).
Minimum dimension
for exhaust valve is 7.975 mm (0.3140 in.).
2.
Inspect valves for cracks, burned faces, and dis-
tortion. Inspect seat face of valves for wear and
damage.
3.
Measure thickness of valve head.
Minimum
thickness for intake valve is 0.5 mm (0.020 in.).
Minimum thickness for exhaust valve is 1.0 mm
(0.040 in.).
If valves need grinding, correct surface angle is
30 for both intake and exhaust valves.
1.
DIAMETER
2.
THICKNESS,
VALVE HEAD
Figure 15. Valve Inspection
6
