Ranger 4WD V6-3.0L VIN U (1997)
Crankshaft: Service and Repair
Refinishing
NOTE: Polish direction is clockwise as viewed from the front of the crankshaft.
Dress minor imperfections such as scores, nicks or burrs with an oil stone.
If journals are severely marred or exceed service limits for wear, taper, or out of round, they should be refinished to size for the next undersize crankshaft
main bearing.
Follow crankshaft lathe manufacturer's instructions for refinishing crankshaft.
If the journals will not clean up to less than the maximum undersize bearing available, replace the crankshaft.
Always reproduce the same journal shoulder radius that existed originally. Too small a radius will result in fatigue failure of the crankshaft. Too large a
radius will result in bearing failure due to radius ride of the crankshaft bearing.
After refinishing the journals, chamfer the oil holes. Polish the journals with a No.500 grit polishing cloth and engine oil (crocus cloth may also be used
as a polishing agent) to obtain a smooth finish.
