Home » 2008 6.6L Duramax » 2008 6.6L Duramax – CRANKSHAFT AND BEARING CLEANING AND INSPECTION

2008 6.6L Duramax – CRANKSHAFT AND BEARING CLEANING AND INSPECTION

1. Clean the crankshaft and bearings.
2. Inspect the crankshaft for the following conditions.
• Excessive wear or damage on the surface of the crankshaft journals.

• Excessive wear or damage to the crankshaft gear.
• Excessive wear or damage on the oil seal fitting surface.
• Inspect the oil ports for obstructions.
• Replace the crankshaft if there is excessive wear or damage to the journals, oil seal fitting surface or to the                     crankshaft gear.

3. Measure the crankshaft run out.
• Mount the crankshaft in wooden V-blocks.
• Set J 7872 on the center o f the crankshaft journal.
• Turn the crankshaft in the normal direction o f rotation.
• Record readings. The production value is 0.05 mm (0.0020 in) and the service limit is 0.44 mm (0.0173 in).

4. Measure the crankshaft journal diameter across four points.
• The crankshaft journal outside diameter is 79.905-79.925 mm (3 .1 4 5 9 -3 .1 4 6 6 in) and the service limit is               79.89 mm (3.1453 in).
• Replace the crankshaft if the measured value is less than the service limit.
5. Measure the crankpin outside diameter across four points.
• The crankpin outside diameter is 6 2 .902-62.922 mm (2.476 5 -2 .4 7 7 2 in) and the service limit is 62.88 mm (2       .4756 in).
• Replace the crankshaft if the measured value is less than the service limit.