3) Sprag Clutch Installation - Rotax MMH-912 Series Maintenance Manual

3.6.3)
Effectivity 912/914 Series
Edition 1 / Rev. 3
BRP-Powertrain
Maintenance Manual
Sprag clutch installation
See Figs. 72-10, 72-11, 72-12, 72-13, 72-14 and 72-15.
Place the sprag clutch into the sprag clutch housing so that the circlip
(19) is visible. To fit the circlip, compress it slightly using circlip pliers and
ensure that clip remains in position and engages fully on the catches in
the sprag unit (20).
■ CAUTION : The circlip must be fitted as shown in Fig. 72-15.
Otherwise, it may not fit tightly.
Fit the circlip (14) with the sloping edge pointing towards the sprag
clutch.
■ CAUTION : If there is a circlip 68 (14) part no. 845420 still fitted, it
must be replaced with a circlip 70 part no. 845245.
◆ NOTE: Circlip 68 and circlip 70 can be distinguished by the
different outside dimension before they are installed.
See Fig. 72-15.
Lock the crankshaft. Degrease taper and threads of the crankshaft and
taper of the sprag clutch housing.
■ CAUTION : Approx. 2 - 3 mm (0.079 - 0.12 in.) on the bottom side
of the sprag clutch housing must be kept free of
LOCTITE 221. If this instruction is not observed, the
bearing bushing and the free wheel gear can adhere to
the crankshaft, which would cause friction wear on the
sprag clutch.
Coat taper of the sprag clutch housing thinly with LOCTITE 221 and fit
on crankshaft. As you do so, turn the free wheel gear so that the sprag
lobes (16) can be aligned.
◆ NOTE: When turned to the left, looking towards the magneto
side of the engine, the free wheel gear (6) must engage
in the crankshaft, and when turned to the right, it must
move freely!
See Fig. 72-14.
72-00-00
page 18
October 01/2010