Engine Service Manual

74
Disassembly/Inspection and Service
KohlerEngines.com 32 690 03 Rev. I
Remove Oil Pan Assembly
1. Remove screws securing oil pan to crankcase.
2. Locate splitting tab cast into perimeter of oil pan.
Insert drive end of a 1/2” breaker bar between
splitting tab and crankcase and turn it to break RTV
seal. Do not pry on sealing surfaces as this can
cause leaks.
Inspection
Inspect oil seal in oil pan and remove it if it is worn
or damaged. New oil seal is installed after oil pan is
assembled to crankcase. See Reassembly, Oil Seal in
Oil Pan.
Inspect main bearing surface for wear or damage (refer
to Specifi cations). Replace oil pan assembly if required.
Governor Assembly
Governor gear assembly is located inside oil pan. If
service is required, continue following steps.
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
Governor Shaft Component and Details
C
A
B
A
34.0 mm (1.3386 in.)
33.5 mm (1.3189 in.)
B 19.40 mm (0.7638 in.)
C Gear Shaft
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
remove regulating pin and governor gear assembly.
2. Remove locking tab thrust washer located under
governor assembly.
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.
Oil Pump Assembly
Oil pump is mounted inside oil pan. If service is required,
continue with Disassembly, Inspection, and Reassembly.
Disassembly
1. Remove screws.
2. Lift oil pump assembly from oil pan. Remove outer
gerotor gear 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. Disassembly of oil pump is not
recommended.
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 of
oil pan.
3. Install oil pump inserting center shaft into
corresponding recess in oil pan. Secure oil pump by
torquing screws (in no specifi c sequence) to 9.9 N·m
(88 in. lb.).
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.
K Governor Gear L
Locking Tab Thrust
Washer
M Oil Pan N Drain Plug
O Oil Seal P Oil Pump
Q Oil Sentry
™
R Ball
S Spring T Oil Pick-up Screen
U
Ground Strap
Location
V Outer Gerotor Gear