Oil Pump Assembly
Oil pump is mounted inside closure plate. If service is required, refer to Disassembly, Inspection, and Reassembly.
Disassembly
1. Remove screws.
2. Lift oil pump assembly from closure plate. Remove outer gerotor gear from closure plate.
3. Ensure ball and spring remain installed in pressure relief hole of closure plate. If ball and spring fall out of
pressure relief hole, see reassembly for correct installation.
4. Remove oil pump cover O-ring from groove in closure plate.
Inspection
Inspect oil pump housing, gear, and rotors for nicks, burrs, wear, or any visible damage. Inspect oil pump cover O-ring
for cuts, nicks, or any visible damage. If any parts are worn or damaged, replace oil pump assembly and/or O-ring.
Check oil pickup screen for damage or restriction, replace if necessary.
Reassembly
1. Lubricate outer gerotor gear with oil. Install outer gerotor gear through shaft of oil pump, around inner gerotor
gear. Matching molding dots on inner and outer gerotor gears is not necessary and will not affect oil pump
effi ciency.
2. Reinstall ball, then spring into pressure relief hole in closure plate.
3. Reinstall O-ring into groove in closure plate; make sure it is fully seated in groove.
4. Install oil pump inserting center shaft into corresponding recess in closure plate. Apply consistent downward
pressure to oil pump cover, compressing oil pressure relief spring and start screws. Secure oil pump by torquing
screws (in no specifi c sequence) to 7.9 N·m (70 in. lb.).
5. After torquing, rotate gear and check for freedom of movement. Make sure there is no binding. If binding occurs,
loosen screws, reposition pump, retorque screws and recheck movement.
Crankcase Components
R
S
U
B
A
T
C
E
D
F
G
H
I
J
K
L
M
N
O
P
O
Q
A Closure Plate Seal B Closure Plate C Oil Pickup Tube D Oil Pump Assembly
E Ball F Spring G
Oil Pump Cover
O-ring
H Outer Gerotor Gear
I Governor Shaft J Governor Washer K Governor Gear L Governor Cup
M Camshaft N Crankshaft O Connecting Rod P Piston
Disassembly/Inspection and Service
68 24 690 32 Rev. AKohlerEngines.com
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