Disassembly/Inspection and Service
80
19 690 01 Rev. --
KohlerEngines.com
Remove Oil Pan Assembly
1. Remove screws securing oil pan to crankcase.
2. Locate protruding tabs on oil pan. Carefully tap to
break gasket seal. Do not pry on sealing surfaces as
this could cause leaks. Separate oil pan from
crankcase. Remove old gasket.
Inspection
Inspect oil seal in oil pan and remove it if it is worn or
damaged.
Inspect crankshaft bearing surface for wear or damage
(refer to Speci
fi
cations). Replace oil pan assembly if
required.
Oil Pump Assembly
Oil pump is mounted inside oil pan. If service is required,
continue with Disassembly, Inspection, and Reassembly.
Disassembly
1. Remove screws securing oil pump housing.
2
. Lift oil pump assembly from oil pan. Remove outer
geroter gear and pickup screen from oil pan.
3. Ensure ball and spring remain installed in pressure
relief hole of oil pan. If ball and spring fall out of
pressure relief hole, see reassembly for correct
installation.
Inspection
Inspect oil pump housing, gear, and rotors for nicks,
burrs, wear, or any visible damage. If any parts are
worn or damaged, replace oil pump assembly. 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 ef
fi
ciency.
2. Reinstall ball, then spring into pressure relief hole in
oil pan.
3. Install oil pump inserting center shaft into
corresponding recess in oil pan. Apply consistent
downward pressure to oil pump cover, compressing
oil pressure relief spring and start screws. Secure oil
pump by torquing screws (in no speci
fi
c sequence)
to 11.3 N·m (100 in. lb.) into new holes, or 7.8 N·m
(69 in. lb.) into used holes.
4. 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.
Q
Gasket
R
Oil Pan
S
Relief Ball
T
Spring
U
Oil Screen
V
Oil Pump
W
Geroter Gear
*Mechanical Governor only.
Governor Gear Assembly (Mechanical Governor)
Governor Shaft Press Depth Detail
B
A
C
A
34.0 mm (1.3386 in.)
33.5 mm (1.3189 in.)
B
19.40 mm (0.7638 in.)
C
Gear Shaft
Governor gear assembly is located inside oil pan.
If service is required, continue with Inspection,
Disassembly, and Reassembly.
Inspection
Inspect governor gear teeth. Replace gear if it is worn,
chipped, or if any teeth are missing. Inspect governor
weights. They should move freely in governor gear.
Disassembly
NOTE: Governor gear is held onto shaft by small
molded tabs in gear. When gear is removed from
shaft, these tabs are destroyed and gear must
be replaced. Therefore, remove gear only if
absolutely necessary.
Governor gear must be replaced once it is removed from
oil pan.
1. Use 2 small screwdrivers and carefully pry upward to
unseat governor gear assembly from governor gear
shaft. Remove regulating pin and governor gear
assembly.
2. Remove locking tab thrust washer and note
orientation.
3. Carefully inspect governor gear shaft and replace it
only if it is damaged. After removing damaged shaft,
press or lightly tap replacement shaft into oil pan to
depth shown.
Reassembly
1. Install locking tab thrust washer on governor gear
shaft with tab down.
2. Position regulating pin within governor gear/
fl
yweights assembly and slide both onto governor
shaft until assembly locks into place.
