Section 03-01A: Engine, 4.9L SFI
1996 F-150, F-250, F-350 (4x2), F-150, F-250 (4x4) Workshop Manual
DESCRIPTION AND OPERATION
Crankshaft
The crankshaft (6303):
Is made from precision cast nodular iron.
Has seven main bearings so each connecting rod is between two main bearings.
Thrust is taken on the fifth main bearing to control end play.
Has a vibration damper consisting of a cast iron inner and outer ring with rubber compressed between them to help control torsional vibration.