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dry and completely free of lubricants. The
presence of lubricants can cause the flywheel
to be overstressed and damaged when the
cap screw is torqued to specification.
B: Make sure square flywheel key is installed only
in the flat area of keyway, not in the rounded
area. The flywheel can become cracked or
damaged if the key is installed in the rounded
area of keyway.
C:
Always use a flywheel strap wrench to hold
flywheel when tightening flywheel fastener. Do
not use any type of bar or wedge between the
cooling fins or flywheel ring gear, as these
parts could become cracked or damaged.
D: Do not use impact wrenches to install the fly-
wheel retaining nut as this may overstress the
nut and crack the flywheel hub.
E:
Do not reuse a flywheel if it has been dropped
or damaged in any way.
F:
Do make a through visual inspection of the
flywheel and crankshaft before installation to
make sure they are in good condition and free
of cracks.
The old crankshaft design has an externally
threaded end and uses a square key, plain
washer, and marsden nut to align and secure
the flywheel.
The new crankshaft design has an internally
threaded end and uses a woodruff key,
washer, and/or bushing, hex cap screw or hex
nut.
1 . Position key properly in keyway as shown in
Figure
12-43
and carefully guide key slot in
flywheel hub over the key while installing to
avoid pushing the key inward.
WRONG
~
RIGHT~
Figure 12-43. Installing A Square Flywheel Key.
Models K91, K161 And K181
Rope Start Models
A. Install rope pulley, plain washer, and hex nut
(lubricate threads with oil). Hold flywheel with
strap wrench and torque hex nut to 40/50 ft.
lb. for K91 and 85/90 ft. lb. for K161 and
K181 . If a hex head sems screw is used,
torque screw to 250 in. lb.
Retractable Start Models
A. Install the grass screen.
B.
Install the drive cup, plain washer, and hex nut
(lubricate threads with oil) . Hold the flywheel
with strap wrench and torque hex nut to 40/50
ft. lb. for K91 and 85/90 ft. lb. for K161 and K
181 . If a hex head sems screw is used, torque
screw to 250 in. lb.
Electric Start Models
A. Install the plain washer and hex nut (lubricate
Ill
threads with oil) . Hold the flywheel with strap
wrench and torque hex nut to 40/50 ft. lb. for
K91 and 85/90 ft. lb. for K161 and K181. If a
hex head sems screw is used, torque screw to
250 in. lb.
B. Install the grass screen.
12.15
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