March 14, 1960
Bulletin No. SB-771
SUBJECT: FLYWHEEL KEY INSTALLATION - 40 H.P. ENGINE.
When assembling the flywheel on the crankshaft, correct
positioning of the flywheel key in the crankshaft is very
essential to obtaining proper magneto timing. Positioning
the key as shown before assembly, Fig. 1, will insure
proper fit of key in the flywheel hub key way for correct
assembly.
It is possible to assemble the flywheel with the key positioned
as shown in figure 2. The hub will, however, ride on the key
and fail to properly seat on the crankshaft taper. The engine
can be started when assembled in this manner, but after a short
period of running both flywheel and crankshaft will become
permanently damaged.
Always be certain the key is properly positioned as shown
in figure 1, and that the flywheel seats completely on
the crankshaft taper before tightening the flywheel nut
to insure correct assembly. Torque to 100-105 ft. lbs.
JOHNSON MOTORS
W. W. DeWees
W. W. DeWees
Service Department
WWD:eb
NOTE: Post on RD index - 40 H.P.