Rotax 912 Series Maintenance Manual page 425

3.1.3)
Effectivity 912/914 Series
Edition 1 / Rev. 0
BRP-Rotax
Maintenance Manual
Oil pump checking
See Figs. 79-7, 79-8, 3179-9, 79-10, 79-11, 79-12 and 79-13.
Visually check all components of oil pump.
Check inside (1) of oil pump cover with a straightedge (2) for wear.
Check all revolving rotors of pump. If there are noticeable furrows on
mating faces of rotor inside (3) and revolving piston outside (4), replace
both components.
Insert revolving pistons and rotors into their respective housings.
Only on 914 Series:
Check the gap dimension (OP01) (suction oil pump) between
crankcase flange surface — revolving piston
crankcase flange surface — pump rotor
Also check the gap dimension (OP01) (main oil pump) between
crankcase flange surface (5) — revolving piston (6)
crankcase flange surface (5) — pump rotor (7)
See 79-00-00 sec. 4.
A bigger gap greatly reduces pump capacity.
Check sealing surfaces of both oil pump housings and pump cover, re-
surface on an even surface plate if necessary.
Check pump shaft at the bearing bores (8).
◆
NOTE: If there is still an older model oil pump shaft fitted on
engines 912 A and 912 UL (identifiable by the roll pin on
the pump shaft) the shaft must be replaced in accor-
dance with SB-912-032 "Replacement of oil pump
assy. or oil pump shaft assy", latest issue.
Remove screw plug (9), pressure spring (10) and ball (11), clean and
check ball seat (12) in pump housing. The compensating shim (13) is
only fitted if required to reach specified oil pressure.
Clean all parts and clear oil bores with compressed air.
79-00-00
page 15
May 01/2007