POWERHEAD - 4-1390-826148R2 MARCH 1997
CAUTION
Removal of lower crankshaft bearing will dam-
age bearing and will require replacement.
4. Inspect lower bearing for roughness and exces-
sive looseness. Remove retaining ring andbear-
ing only if necessary.
a
b
a - Retaining Ring
b - Bearing
51081
a
b
a - P/N 91-827001A1
b - P/N 91-37241
5. Inspect oil drive gear for cracks and excessive
wear. Replace if necessary.
51084
a
b
a - Oil Drive Gear
b - Key
Crankshaft Inspection
· Inspect crankshaft to drive shaft splines for wear.
(Replace crankshaft, if necessary.)
· Check crankshaft for straightness [(0.003 in.
(0.076mm) maximum]. (Replace as necessary.)
· Inspect crankshaft oil seal surfaces. Sealing sur-
faces must not be grooved, pitted or scratched.
(Replace as necessary.)
· Checkallcrankshaftbearingsurfacesforrust,wa-
ter marks, chatter marks, uneven wear and/or
overheating. (Refer to “Connecting Rods”.)
· If necessary, clean crankshaft surfaces with cro-
cus cloth as shown.
· Thoroughly clean (with solvent) and dry crank-
shaft and crankshaft ball bearings. Recheck sur-
faces of crankshaft. Replace crankshaft if sur-
facescannotbeproperlycleanedup.Ifcrankshaft
will be reused, lubricate surfaces with 2 cycle oil
toprevent rust.DO NOTlubricate ballbearingsat
this time.
WARNING
DO NOT spin-dry crankshaft ball bearing with
compressed air.
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