59
4
10
Remove Crankshaft
1. Drain oil from engine and all fuel from fuel
tank into appropriate container.
2. Remove external components including
flywheel assembly.
3. Remove burrs and clean crankshaft PTO,
then remove sump.
4. Carefully tip engine with PTO-end facing
up.
5. Rotate crankshaft to place piston at top
dead center.
6. Remove connecting rod cap, then rotate
and slide out crankshaft.
Inspect Crankshaft
1. Inspect crankshaft for scoring on mag
journal (A, Figure 10-1), crankpin journal
(B), and PTO journal (C). Replace
crankshaft if scoring is found.
2. If crankshaft is bent, replace it. DO NOT
attempt to straighten crankshafts.
3. Using a dial caliper or micrometer,
measure the journal diameters. Compare
results to values listed in Section 12 -
Engine Specifications. If wear meets or
exceeds the reject dimensions, replace
the crankshaft.
4. Inspect timing gear for any evidence of
wear, distortion, or damage. Replace gear
if any damage is found.
Install Crankshaft
1. Lubricate the magneto bearing/oil seal
with engine oil.
2. Support both ends of the crankshaft, and
carefully install into the cylinder.
3. Rotate crankshaft until crankpin journal fits
into connecting rod.
4. Lubricate the crankpin journal with engine
oil, then assemble connecting rod to
crankshaft and torque cap screws to
values listed in Section 12 - Engine
Specifications.
NOTE: The screw closer to the piston must be
tightened first.
5. Install the timing gear to the crankshaft.
6. Align timing marks on timing gear and cam
gear (D), then install cam gear on boss in
cylinder.
Install Sump to Cylinder
1. Insert correct seal protector from Kit
#19356, to protect oil seal when installing
sump.
2. Place new gasket on cylinder.
3. Install sump on cylinder, making sure
spindle in sump fits into cam gear, and all
gears mesh. Do not force sump.
4. Install screws and tighten in sequence
shown (E). Torque screws to values listed
in Section 12 - Engine Specifications.
Check and Adjust Crankshaft End
Play
When the sump is installed with a standard
gasket, end play should match the value listed in
Section 12 - Engine Specifications.
If end play is less than specified, remove sump
and install an additional gasket. Do not use more
than two gaskets.
If end play is more than specified, remove sump
and install a shim per the Illustrated Parts List.
Install shim on PTO-end of crankshaft (E),
between timing gear and sump.
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