Thunderbird V8-4.6L VIN W (1997)
Crankshaft: Service and Repair
Refinishing
CAUTION:
Main And Pin Journal Fillets
Because the crankshaft incorporates deep rolling of the main and pin journal fillets, journal refinishing is limited to 0.25 mm (0.010 inch)
undersize of standard journal dimensions. Further journal refinishing may result in fatigue failure of the crankshaft.
Journal Undercuts
Journal undercuts have been deep fillet rolled, any machining or damage to the undercuts may result in crankshaft failure.
Journal Radius
Always reproduce the same journal shoulder radius which 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 bearing.
1. Dress minor imperfections such as scores, nicks or burrs with an oil stone.
2. If the journals are severely marred or exceed the service limit, refinish to size for the next undersize bearing.
3. If the journals will not clean up to maximum undersize bearing available, replace the crankshaft.
4. After refinishing the journals, chamfer the oil holes.
5. Polish the journal with a No. 500 grit polishing cloth and engine oil (crocus cloth may also be used) to obtain a smooth finish.
6. Remove all grinding dust from oil passages with compressed air.
