F 550 2WD Super Duty V8-6.4L DSL Turbo (2008)
Crankshaft Main Bearing: Testing and Inspection
Crankshaft Main Bearing Journal Taper and Out-of-Round
Crankshaft Main Bearing Journal Taper and Out-of-Round
1. CAUTION: To prevent engine damage, the crankshaft must be reground or a new crankshaft installed if journals exceed maximum
out-of-round and/or taper specifications.
Use a 75-100 mm (3-4 inch) micrometer to measure the diameter of each main journal. Measure the journal at 2 points, 90 degrees apart. Measure
and record readings for each of the 4 main journals. The difference between readings will be the main journal out-of-round value.
