POWERHEAD
90-883728 JULY 2001 Page 4A-55
Crankshaft Installation
SPECIAL INFORMATION
Installing A New Crankshaft Assembly Into Cylinder 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 crank-
shaft. 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 recom-
mended 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
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a
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 making sure that the dowel pins are lined up
with the holes in center main bearings and crankshaft seal rings are in place.
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