Rotax MMH-912 Series Maintenance Manual page 126

Effectivity 912/914 Series
Edition 1 / Rev. 3
BRP-Powertrain
Maintenance Manual
Clean sealing surface of gearbox housing and crankcase. Oil which drains
onto the sealing surface will eventually create a leak. Insert both dowel pins
6x20 into crankcase. Grease oil seal for propeller shaft in crankcase.
Lubricate bearing bore for propeller shaft.
◆ NOTE: Engines of the 912/914 Series configuration 3 and
configuration 4 have no oil seal.
Keep the rollers of the roller bearing in position with grease to facilitate
assembly of propeller shaft.
Position gearbox housing with completely pre-assembled gear unit,
previously coated with a thin layer of sealing compound LOCTITE
5910. Turn propeller shaft slightly to allow the dog gear to engage. By
gently tapping on the gearbox housing (not on the propeller shaft) with
a plastic mallet, the gearbox is fitted on the crankcase.
◆ NOTE: If there is resistance with a gap of approx. 10 mm (0.4
in.), the alignment of the rollers may need readjusting.
Fix the rollers in position again with grease, press them
outwards and / or turn the vacuum pump /governor gear
slightly to allow engagement.
■ CAUTION : If excessive force is applied at assembly, the roller
bearing or the vacuum pump drive can be damaged.
If the sealing surface becomes oily during the assembly process, clean
it and reapply surface sealing compound LOCTITE 5910 or 574.
Tighten gearbox evenly with 2 allen screws M8x45 and 8 allen screws
(7) M6x45 and lock washers in a crosswise pattern.
Fig. 72-56
9
7
GB18
8
07508
72-00-00
page 54
October 01/2010