(5) Valve inserts
Inspect valve inserts for excessive wear, pitting, cracking, or improper seat angle. Replace
inserts as follows:
Place cylinder head on wood blocks
with bottom side up.
Using valve seat insert remover (82),
remove valve seat insert (83).
Clean valve seat insert counterbore in
cylinder head and inspect for
concentricity, flatness, and cracks.
Insert counterbore has a diameter of
1.2600 to 1.2610 inches and a depth
of 0.3380 to 0.3520 inch.
Counterbores must be concentric with
valve guides within 0.003 inch total
(d) Immerse cylinder head in water heated
to 180oF-200oF (82°C-93oC) for 30
minutes or cool insert with liquid
Install insert in cylinder head while
head is still hot and insert is at room
temperature or when insert is chilled
and head is at room temperature.
(e) Place cylinder head on a bench with
bottom side up. Place insert in
counterbore with valve seat side facing
Using valve seat insert installer (84),
drive insert in place until it seats solidly
in cylinder head.
C h a n g e 15-47