Locking Of The Crankshaft - Rotax 912 Series Maintenance Manual

2.7)

Locking of the crankshaft

See fig. 1 and 2
Remove the plug screw (1) M8x20 and sealing washer from the crankcase half
(cyl. 2/4) Turn crankshaft until the pistons of cyl. no. 1 and no. 2 are in T.D.C. and
lock crankshaft in this position with the crankshaft locking screw (2) part no.
240 880.
NOTE:
To facilitate finding of the correct crankshaft position, turn the crankshaft such
that the flywheel hub is in the same position as mentioned on fig. 2.
The required recess (3) position of the crankshaft can be additionally verified by
looking through the crankcase hole (4) with a flash light.
Turn-in crankshaft locking screw and rotate crankshaft slightly to-and-fro until
the screw engages noticeably in the recess (3) of the crankshaft and tighten
locking screw to 10 Nm (90 in. lb).
After completion of work/check:
Remove the crankshaft locking screw (2) and refit the plug screw M8x20 (1)
along with a new sealing washer. Tighten the screw to 22 Nm (195 in.lb).
Verify free rotation of the crankshaft by turning the crankshaft with a wrench
A/F 24 on the hex.screw (5) on the magneto side end.
04625
2
1
fig. 1
Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL
The crankshaft locking screw is part of the standard tool kit
supplied with each engine.
4
3
Drehzahlmesser
rev. counter
A3/4
B1/2
01280
B3/4
A1/2
5
fig. 2
12-00-00
page 11
Rev. 1, Jan. 01/2002