CYLINDER HEAD
62
9. Remove the five screws securing the valve
cover using a 10mm wrench.
See Figure 9.4.
10. Loosen the jam nuts and fulcrum nuts that
secure the rocker arms using a 10mm wrench
and a 14mm wrench.
11. Pivot the rocker arms aside, or remove them
completely, and remove the push rods.
NOTE: Once broken-in, the rocker arm should
be kept with its corresponding valve.
NOTE: The intake and exhaust push rods are
identical and interchangeable. It is preferable,
but not absolutely necessary, to return the same
push rods to their original locations on engine
with substantial (
>100 hours) operating time.
12. If replacing the head, double-nut and remove the
exhaust and carburetor studs.
13. Remove the cylinder head bolts using a 12mm
wrench.
See Figure 9.5.
NOTE: The 490 engine has an over sized bolt
with a Belleville washer in the number 4 position.
The wrench size and torque is the same as the
other three bolts.
See Figure 9.6.
Figure 9.4
Remove valve cover
Figure 9.5
Cylinder head
bolts
1
2
3
4
Figure 9.6
Oversized bolt
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