NOTE
In place of the above procedure a
new cam operated insert remover J
23479-15 and collet J 23479-10 can
be used to remove the exhaust
valve seat insert from the cylinder
head.
I n s t a l l Exhaust Valve Seat Insert
1. Clean the valve seat insert counter-
bores in the cylinder head with trichlo-
roethylene or other suitable solvent.
Also wash the valve seat inserts with the
same solvent. Dry the counterbores and
the inserts with compressed air.
2. Inspect the counterbores in the cylin-
der head for cleanliness, concentricity,
flatness and cracks. The counter bores
have a diameter of 1.260" to 1.261" and a
Figure 11B-60. Installing Valve Seat
depth of 0.338" to 0.352". The counter-
bores must be concentric with the valve
guides within 0.003" total indicator read-
the valve head must not be less the
ing. Valve seat inserts which are 0.010"
0.031" in thickness and must still be
oversize on the outside diameter are
within the specifications shown in
available, if required.
Figure 11B-61 after refacing.
3. Immerse the cylinder head for at least
thirty minutes in water heated to
180-200F (82-93C).
4. Rest the cylinder head, bottom side
up, on a bench and place an insert in
the counterbore valve seat side up
In-
stall the insert in the cylinder head-while
the head is still hot and the insert is at
room temperature, otherwise installation
will be difficult and the parts may be
damaged.
Figure 11B-61. Relationship of New
5. Drive the insert in place with installer
Valve, Insert and Cylinder Head
J 6568 as shown in Figure 11B-60 until it
seats solidly in the cylinder head.
NOTE
6. Check the valve seat inserts for con-
The seating area of the exhaust
centricity in relation to the valve guides
valve is aluminized, which gives
a s outlined below.
the valve seat a dull finish. Do
not remove the aluminum coating
on a new valve. However, a used
v a l v e may be refaced if necessary.
Recondition Exhaust Valve and Valve
Seat
Before either a new or used valve is in-
An exhaust valve which is to be reused
stalled, examine the valve seat insert in
may be refaced, if necessary (see
the cylinder head for proper valve seat-
Figure
11B-62
on
page
11B-40).
To
ing. The proper angle for the seating
provide sufficient valve strength and
face of the valve is 30 and for the valve
spring tension, the edge of the valve at
seat insert it is 31.
11B-39
Engine (Less Major Assemblies)
