4A-36 - POWERHEAD 90-824052R3 JUNE 2002
Crankshaft Installation
SPECIAL INFORMATION
Installing A New Crankshaft Assembly Into Cylin-
der Block
Check the crankshaft sealing ring mating surfaces in
the cylinder block and crankcase cover for wear
grooves that were caused by the crankshaft sealing
rings from the previous crankshaft. If wear grooves
are present, the sealing rings on the new crankshaft
will have to fit into the grooves without binding the
crankshaft.
Before installing crankshaft, remove any burrs that
may exist on groove edges.
Lubricate sealing rings with light oil and install new
crankshaft as instructed.
Install upper and lower end caps and then inspect fit
between sealing rings and grooves. Temporarily
install crankcase cover and rotate crankshaft several
times to check if sealing rings are binding against
crankshaft. (You will feel a drag on the crankshaft.) If
sealing rings are binding, recheck grooves for burrs.
If this does not correct the problem, it is
recommended that the cylinder block be replaced.
Install crankshaft as follows:
1. Lubricate crankshaft sealing rings with light oil.
2. Check cylinder block to be sure that dowel pins
are in place.
a
51848
a - Dowel Pins
3. Position all crankshaft seal ring gaps straight up.
4. Align hole in each center main bearing race with
dowel pin.
5. Gently push crankshaft down into position mak-
ing sure that the dowel pins are lined up with the
holes in center main bearings and crankshaft
seal rings are in place.
a
51848
a - Dowel Pin
6. Lubricate crankshaft ends (oil seal areas) with
light oil, then install upper and lower end caps (“a”
and “b”). Secure end caps to cylinder block with
attaching bolts. DO NOT tighten end cap bolts at
this time.
51848
b
a
a - Upper End Cap
b - Lower End Cap
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