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SECTION 10
INSPECTION AND RECONDITIONING
5. Assemble adapter to valve seat puller forcing
screw and slide hammer to adapter. (See
Figure 10-9b.)
6. Use slide hammer to remove valve seat insert.
Install Valve Seat Insert
To install valve seat insert, proceed as follows:
1. Make sure valve seat insert bore is clean and free
of nicks or burrs.
2. Align valve seat insert in counterbore and using
valve seat installer and driver (Refer to Section 2,
"Special Tools"), press seat in until bottomed,
3. Use a standard valve seat cutter (see Figure
10-10) and cut seat to dimensions shown in
Figure 10-5.
Valve Seat
Cutter (Typical
Figure 10-10. Standard Valve Seat Cutter.
Reground or new valves must be lapped in, to provide
fit. Use a hand valve grinder with suction cup for final
lapping. Lightly coat valve face with "fine" grade of
grinding compound, then rotate valve on seat with
grinder. Continue grinding until smooth surface is ob-
tained on seat and on valve face. Thoroughly clean
cylinder barrel in soap and hot water to remove all
traces of grinding compound.
After drying cylinder
barrei, apply a light coating of SAE 10 oil to prevent
rusting.
Valve Stem Seals
These engines use valve stem seals on the intake
valves. Always use new seals when valves are re-
moved from cylinder. Seals should also be replaced if
deteriorated or damaged in any way. Never reuse old
seals.
PISTONS AND RINGS
Identification
Ali Magnum M18 and M20 engines use the new,
style D pistons and matching piston rings. Style D
pistons are identified by the installation direction iden-
tifier "Fly", which is stamped into the top of the plston,
and by the rectangular recessed area around the pis-
ton pin. See Figure 10-11.
Also, the piston pin
bosses are thicker than other styles of similar pistons.
Figure 10-11, Style D Piston.
NOTE:
The Posi-Lock connecting rods used with the
style D pistons are narrower at piston pin end
1o accommodate the increased piston pin
boss thickness. See "Posi-Lock Connecting
Rods" elsewhere in this section.
10.9
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