Cooling System; 1) Water Pump Removal; 2) Water Pump Housing Disassembly And Inspection - Rotax 912 Series Maintenance Manual

13.3) Cooling system

13.3.1)
3
6
00344
13.3.2)
O
I T
00377
fig. 068
Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL II
Water pump removal
See fig. 065, 066 and 067.
fig. 065
The water pump is integrated in the ignition housing. For mainte-
nance works the magneto hub Q and the magneto housing W
1
have to be removed. On some engine installations this requires
removal or partial lifting of engine.
To remove the hex. screw E M16x1,5 from the flywheel hub the
crankshaft has to be looked, see Maintenance Manual 912 Series
(Line Maintenance) Chapter 12-00-00 para 2.7.
7
2
Water pump housing disassembly and inspection
See fig. 068 and 069.
Remove the 2 Allen screws M6x20
remove water inlet elbow with O-ring.
Register the position of the inlet elbow W!
NOTE:
Remove the 4 hose clamps from water drain hoses and from water pump
housing R. By removing 5 Allen screws M6 E the water pump housing R
with gasket T can be taken off.
The Allen screw M6x35 Y reaches into the water
CAUTION:
chamber, therefore it is of stainless steel and fitted with
a sealing ring U 6x10.
Check inside for traces of possible contact with impeller I.
The clearance is not within manufacturers recommenda-
R
tions the installation has to be done again and new rotary
E
W
E
Q
of the water inlet elbow
seal and new oil seal must be installed, see SI-
912-001. The shim O fitted behind the impeller
is of stainless steel.
Remove the impeller I with special tool, part
no 877 295, with crankshaft locked, turning
counter-clockwise.
Q
7
Y
W
and
page 51
Initial issue, Jan. 01/2002