5) Water Pump Shaft Disassembly; 6) Rotary Seal Disassembly - Rotax 912 Series Maintenance Manual

13.3.5)
2
fig. 076
13.3.6)
1
Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL II
Water pump shaft disassembly
See fig. 076 and 077.
It is an advantage to loosen the impeller already when dismantling
the engine (with crankshaft locked). Otherwise block water pump
drive gear Q with suitable tool. Unscrew impeller using impeller
1
wrench 877 295 to avoid damage to the impeller blades. Place
ignition cover on a suitable plain surface and press water pump shaft
out with a suitable punch W. Remove drive gear Q.
NOTE: With design year 1994 the transmission ratio on water
pump drive was changed from 24:16 Q into 26:16 thus
00384
increasing the water pump speed.
Inspect water pump shaft E for wear. Pay attention to possible
corrosion at the thread end R. If engine is run without antifreeze,
formation of corrosion is possible in this position.
If corroded, replace the water pump shaft.
NOTE: The shaft has a conical end T.
Rotary seal disassembly
See fig. 078.
Remove old oil seal and rotary seal utilizing 2 pins Q (approx. 5 mm dia.
= 0,2 in.) and suitable punch W. Oil seal and rotary seal will be destroyed
at removal and must be renewed.
2
00386
fig. 078
fig. 077
00385
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page 55
Initial issue, Jan. 01/2002