15) Propeller Gearbox - Re-Fitting - Rotax 914 F Maintenance Manual

14.4.15) Propeller gearbox — re-fitting
8
9
7
Pic. 242
Date
Page
1997 02 01
246
See Pic. 241 and 242.
Visually check p.t.o. side crankshaft
Q, see dimension u in Chapter 15).
Slide drive gear W onto crankshaft
E. Fit hex. nut R M30x1,5 secured
with LOCTITE 221 and friction
washer T VS 30 on crankshaft.
Torque to 200 Nm (1770 in.lb).
ATTENTION: Dog gear and drive
gear are paired
and are marked with a consecutive serial number Y. Use
only parts of the same serial number!
Clean sealing surface of gear cover and crankcase. Insert both dowels 6x20
into crankcase. Grease oil seal 30x52x7 for propeller shaft in crankcase.
Lubricate bearing bore for propeller shaft.
NOTE: On engines type 914 F3 / F4 this oil seal is not fitted.
Keep the rollers of the roller bearing in position with grease to facilitate
assembly of propeller shaft.
Position gear cover with completely pre-assembled gear unit, previously
coated with sealing compound LOCTITE 574. Turn propeller shaft slightly to
allow the dog gear to engage. By gently tapping on the gear cover with a
plastic mallet (not on propeller shaft) the gearbox is fitted on crankcase.
NOTE: If there is resistance, at a gap of approx. 10 mm (.4 in.) the
rollers must be better aligned and/or the vacuum pump gear
be turned to allow engagement.
ATTENTION: If excessive force is applied at assembly, the roller bearing
or the vacuum pump drive can be damaged. If sealing face
becomes oily during assembly process, clean it and apply
again sealing compound LOCTITE 574.
Tighten gearbox evenly with 2 Allen screws M8x45 and 8
Allen screws U M6x45 and lockwashers crosswise. Torque
for M8 = 25 Nm (220 in.lb), for M6 = 10 Nm (90 in.lb).
Check gear backlash (see dimension i in Chapter 15) with
dial gauge I on propeller flange O.
Remove crankshaft locking screw and fit crankshaft plug
screw with Cu sealing ring and tighten to 22 Nm (195 in.lb).
For verification turn crankshaft with wrench 24 a/f on hex.
screw on magneto side.
00473
Main
914 F
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6
4
Reference
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Pic. 241
00275
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Modification no.
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