Powerhead
Page 4A-46 90-8M0050731 MAY 2011
Powerhead Assembly
Powerhead Preassembly Cleaning Recommendations
IMPORTANT: Any threaded hole or bolt with threadlocking compound that is contaminated with oil, must be thoroughly cleaned
with a solvent to remove all traces of oil contamination. Failure to remove oil contamination will result in poor threadlocking
compound adhesion.
Prior to assembling the powerhead, all threaded holes on the crankcase cover and cylinder block must be cleared of threadlocking
compound dust. Use compressed air to clear threadlocking compound dust.
Wash the cylinder block and crankcase cover with hot soapy water to remove debris and honing compound. Dry the cylinder block
with compressed air. Failure to thoroughly clean the cylinder block of honing compound and debris will result in premature engine
failure.
Crankshaft Bearings Installation
1. If the lower crankshaft ball bearing has been removed, press it onto the crankshaft as shown. Ensure that the bearing is
pressed firmly against the shoulder.
2. Reinstall the retaining ring using a suitable pair of snap ring pliers.
a - Crankshaft
b - Press
c - Suitable mandrel
d - Crankshaft ball bearing
e - Retaining ring
f - Snap ring pliers
3. If the crankshaft sealing rings have been removed, spread the new rings just enough to slide them over the crankshaft journal.
4. Use the piston ring expander tool to install the crankshaft sealing rings into the grooves.
a - Crankshaft sealing rings
b - Piston ring expander tool
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