Service Manual

Single Stage Snowthrower Service Manual 5 - 21
DRIVE SYSTEMS
7. Retighten the four bolts in the sequence shown
(Figure 108). Then tighten the starter housing bolt
on the right side of the unit (Figure 107). The four
nuts located on the crankshaft side (left side of
unit) of the engine should be torqued to 170 - 220
in·lbs. The bolt on the starter housing should be
torqued to 90 - 120 in·lbs.
Figure 108 0217-059
Note: Not following the tightening sequence can lead
to crankshaft breakage due to excessive stress. Also,
if the four nuts are over tightened, the engine casting
may break.
Note: Never attempt to install the chain to the engine
sprocket by rolling the chain onto the sprocket with the
engine firmly mounted to the equipment.
8. Replace the shrouding, chain guard, spark plug,
and lead wire.
Crankshaft Sprocket Replacement (all models)
1. Refer to "Chain Adjustment Procedure (all
models)" on page 5 - 20. Complete steps 1
through 5.
2. Slide the engine forward until the chain is slack.
3. Using a needle nose pliers, remove the locking
clip on the master connecting link of the chain.
Remove the chain (Figure 109).
Figure 109 0217-060
4. Using the appropriate allen wrench, loosen the
allen head screws on the crankshaft sprocket
(Figure 110). Remove the old sprocket from the
crankshaft.
Figure 110 0217-061