Kohler K91 Service Manual page 110

Remove Valve Seal Insert
To remove a valve seat insert , refer to Figure
1 1 -8 and proceed as follows :
Install valve seat puller on forcing screw and
1 .
lightly secure with washer and nut.
2 . Center the puller assembly o n valve seat in­
sert.
3 . Hold forcing screw with a hex wrench to pre­
vent turning and slowly tighten nut . See Figure
1 1 -8a .
a.
Valve Seat
Insert
b.
Slide
Hammer ----. .. . :
Valve Seat
Insert Puller
Forcing Screw
Figure Pulling Valve Seat Insert
1 1 -8 .
3/1 6" Hex
__
,
,
,
,
, ,
,
,
oJ '
t:: �
[ - -1
t��l
��:�
-
(Typical) .
NOTE : Make sure sharp lip on puller (see insert)
engages in joint between bottom of valve seat in­
sert and cylinder block counterbore, all the way
around .
4 . Continue t o tighten n ut until puller i s tight
against valve seat insert .
5 . Assemble adapter to valve seat puller forcing
screw and slide hammer to adapter. See Fig­
ure 1 1 -8b.
Use slide hammer to remove valve seat insert .
6.
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 i n counterbore and us­
ing valve seat installer and driver (refer to
" Special Tools " section) , press seat in until
bottomed .
3 . Use a standard valve seat cutter (see Figure
1 1 -9) and cut seat to dimensions shown in
Figure 1 1 -5 .
Valve Seat
Cutter (Typical) __
Pilot
Figure Standard Valve Seat Cutter.
1 1 -9 .
Reground or new valves must be lapped in to pro­
vide proper fit . Use a hand valve grinder with suc­
tion cup for final lapping . Lightly coat valve face
with " fine " grade of grinding compound , then ro­
tate valve on seat with grinder. Continue grinding
until smooth surface is obtained on seat and on
valve face . Thoroughly clean cylinder block in soap
and hot water to remove all traces of grinding
compound . After drying cylinder block apply a light
coating of SAE 1 0 oil to prevent rusting.
1 1 . 7