Kohler MAGNUM M18

SECTION 10
INSPECTION AND RECONDITIONING
5/16"
Reamer
Figure 10-8. Reaming Valve Guide.
Valve Seat Inserts
Intake valve seats are usually machined into the cylin-
der barrel, however, certain applications may specify
hard alloy inserts. The exhaust valve seats are re-
placeable alloy inserts. If the seats become badly
pitted, cracked, or distorted, the inserts must be re-
placed.
The Inserts are a tight press fit in the cylinder barrel. A
valve seat removal tool is recommended for this job
(Refer to Section 2, "Special Tools"). Since insert re-
moval causes loss of metal in the insert bore area,
use only Kohler service replacement inserts, which are
slightly larger to provide retention in the cylinder bar-
fel. Make sure new inserts are properly started and
pressed into bore to prevent cocking of the insert.
Remove Valve Seat Insert
To remove a valve seat insert, refer to Figure 10-9 and
proceed as follows:
Forcing Screw
3/16" Hex
Valve Seat Wrench
9/16" Open-end
or Box Wrench
ЕА
Barrel
a Adapter
Valve Seat
Insert Puller
Hex Nut
Washer
ә №
Figure 10-9. Pulling Valve Seat Insert.
. Install valve seat puller on forcing screw and light-
ly secure with washer and nut.
Center the puller assembly on valve seat insert.
Hold forcing screw with a hex. wrench to prevent
tuming and slowly tighten nut. (See
Figure 10-9a.)
. Continue to tighten nut until puller is tight against
valve seat insert.
10.8