90-824052R3 JUNE 2002 POWERHEAD - 4A-29
Crankshaft
1. Inspect crankshaft to drive shaft splines for wear.
(Replace crankshaft, if necessary.)
2. Check crankshaft for straightness. (Replace as
necessary.)
3. Inspect crankshaft oil seal surfaces. Sealing sur-
faces must not be grooved, pitted or scratched.
(Replace as necessary.)
4. Check all crankshaft bearing surfaces for rust,
water marks, chatter marks, uneven wear and/or
overheating. (Refer to “Connecting Rods”.)
5. If necessary, clean crankshaft surfaces with
crocus cloth.
b
a
c
c
51847
a - Crankshaft Journals
b - Crocus Cloth
c - Work Cloth “Back-and-Forth”
WARNING
DO NOT spin-dry crankshaft ball bearing with
compressed air.
6. Thoroughly clean (with solvent) and dry
crankshaft and crankshaft ball bearing. Recheck
surfaces of crankshaft. Replace crankshaft, if
surfaces cannot be properly “cleaned up.” If
crankshaft will be re-used, lubricate surfaces of
crankshaft with light oil to prevent rust. DO NOT
lubricate crankshaft ball bearing at this time.
Crankshaft (and End Cap) Bearings
1. After cleaning crankshaft, grasp outer race of
crankshaft ball bearing (installed on lower end of
crankshaft) and attempt to work race back-and-
forth. There should not be excessive play.
2. Lubricate ball bearing with light oil. Rotate outer
bearing race. Bearing should have smooth action
and no rust stains. If ball bearing sounds or feels
“rough” or has “catches,” remove and discard
bearing. (Refer to “Powerhead Removal and
Disassembly - Crankshaft Removal and
Disassembly”).
Lower Ball
Bearing
3. Thoroughly clean (with solvent) and dry
crank-shaft center main roller bearings.
Lubricate bearings with 2-Cycle Outboard Oil.
CAUTION
DO NOT intermix halves of upper and lower
crank- shaft center main roller bearings. Replace
bearings in pairs only.
4. Thoroughly inspect center main roller bearings.
Replace bearings if they are rusted, fractured,
worn, galled or badly discolored.
Center main
Roller Bearing
5. Clean (with solvent) and dry crankshaft roller
bearing that is installed in upper end cap. Lubri-
cate bearing with light oil.
6. Thoroughly inspect upper end cap roller bearing.
If roller bearing is rusted, fractured, worn, galled,
badly discolored or loose inside of end cap
replace end cap and roller bearing as an
assembly.
Upper Roller
Bearing