Kohler K91 Service Manual page 132

dry and completely free of lubricants . The
presence of lubricants can cause the flywheel
to b e overstressed and d am aged when the
cap screw is torqued to specification .
B : M a ke sure square flywheel key is installed only
in the flat area of keyway, not in the rounded
a rea . The flywheel can become cracked or
d am aged if the key i s installed in the rounded
area of keyway .
C: Always use a flywheel strap wrench to hold
flywheel when tightening flywheel faste n e r . Do
not use any type of bar or wedge between the
cooling fins o r flywheel ring gear, as these
parts could becom e cracked or damaged .
Do not use i mpact wrenches to install the fly­
0 :
wheel retaining nut as this m ay overstress the
nut and crack the flywheel hUb.
E : D o not reuse a flywheel if i t h a s been d ropped
or damag ed in any way.
F : D o make a through visual inspection o f the
flywheel and crankshaft before i nstallation to
m ake sure they are in good condition and free
of cracks.
The old crankshaft design has a n externally
threaded end and uses a s q u are key, plain
washer, and marsden nut to align and secure
the flywheel .
The n ew crankshaft design h a s an interna l ly
threaded end a n d uses a woodruff key,
washer, and/or bushi n g , hex cap screw or hex
nut .
1 . Position key properly in keyway as shown in
Figure 1 2-43 and carefully guide key slot in
flywheel h u b over the key while installing to
avoid pushing the key inward .
RIGHT
Figure 1 2-43. Installing A Square Flywheel Key.
Models K91 , K 1 S1 And K 1 a1
Rope Start Models
A. Install rope pulley, plain washer, and hex n ut
( l u bricate threads with oil) . Hold flywheel with
strap wrench a n d torque hex nut to
lb. for K91 and 85/90
K 1 8 1 . If a h e x h ead s e m s screw i s used ,
torque screw to
250
Retractable Start Models
A . Install t h e grass screen .
I nstall the drive cup, plain wash e r , and hex nut
B .
( l ubricate threads with oil) . Hold t h e flywheel
with strap wrench and torque hex nut to
ft. lb. for K9 1 and
85/90
1 81 . If a hex head sems screw is used , torq ue
screw to
250 in. lb.
Electric Start Models
A. I n stall the plain washer and hex nut ( l ubricate
threads with oil) . Hold the flywheel with strap
wrench a n d torque hex nut to
K9 1 and ft. lb. for K1 6 1 and K1 8 1 . If a
85/90
hex h ead sems screw is used , torque screw to
250 in. lb.
B . Install t h e grass scre e n .
WRONG
40/50 ft.
ft. lb. for K 1 6 1 a n d
in. lb.
40/50
ft. lb. for K 1 6 1 and K
40/50 ft. lb. for
1 2 . 1 5