Lubricating System; 1) Oil Pump Removal; 2) Oil Pump Checking - Rotax 912 Series Maintenance Manual

13.2) Lubricating system

Besides the maintenance work prescribed in para
12 and description of the oil circuit in the engine in
para 10 further work for maintenance is de-
scribed as follows:
13.2.1)
00073
fig. 056
9
8
00369
fig.058
11
12
10
13
00371
fig. 060
Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL II
Oil pump removal
See fig. 055.
Remove oil filter Q with strap spanner,
part no. 877 620. Remove 4 Allen screws
W M6x50 with lock washers and the oil
pump ass'y with 3 O-rings E.

13.2.2) Oil pump checking

2
See fig. 056, 057, 058, 059, 060 and 061.
Remove oil pump cover and check inside
Q with a straightedge W for wear. The gap
between pump cover E, revolving piston
R and rotor T, see dimension W in
1
para 15.
Withdraw revolving piston and rotor, driv-
ing pin and pump shaft. At noticeable furrows on
mating faces of rotor inside Y and revolving piston
outside U renew both components. A bigger gap
greatly reduces pump capacity. Check sealing
faces of oil pump housing and pump cover, plane on
an even plate if necessary. Check pump shaft on
the bearing seats I. As a spare part, the pump
shaft O is supplied with driving pin pressed in.
Remove plug screw P from pressure release
valve { with pressure spring }, clean and check
ball seat in pump housing. The shim q is only fitted
if required to reach specified oil pressure.
Clean all parts and clear oil bores with compressed
air.
On engine type 912 configuration 3 the oil pump
housing is machined for an additional connection w
for the pressure oil line for the propeller governor.
On version 912 configuration 2 and 912 configuration
4 this connection is closed with a plug screw. e =
oil pressure sensor.
00072
fig. 055
W
Q
90
80
70
2
3
4 5 6
60
3
5
4
fig. 057
7
00370
fig. 059
15
14
fig. 061
Initial issue, Jan. 01/2002
E
E
0
10
20
30
0
1 9
8 0.01mm
7
40
50
00074
6
04705
page 48