Crankshaft Inspection

SA9179NE Dial Indicator

Inspect the crankshaft for runout:

1. Place the crankshaft on V-blocks.
2. Using a SA9179NE or equivalent, measure the circle runout at the center journal.
Maximum circle runout: 0.050 mm (0.002 in) max. If the circle runout is greater than maximum, replace the crankshaft.




Important

0.012 mm (0.0005 in) and 0.025 mm (0.001 in) undersized main and thrust bearings are available to adjust for correct main journal oil clearance.

3. Using a micrometer, measure the diameter of each main journal and crank pin.
Main Journal Diameter
• Standard: 56.993-57.007 mm (2.2438-2.2444 in)
• Service Limit: 56.99 mm (2.2437 in) min.
Rod Journal Diameter
• Standard: 46.99-47.01 mm (1.85-1.8508 in)
• Service Limit: 46.99 mm (1.85 in) min.
Main Journal Oil Clearance
• Standard: 0.006-0.05 mm (0.0002-0.002 in)
• Service Limit: 0.06 mm (0.0024 in) max.
Rod Journal Oil Clearance
• Standard: 0.003-0.053 mm (0.0001-0.0021 in)
• Service Limit: 0.063 mm (0.0025 in) max.





Important

If taper and out-of-round are greater than maximum, grind or replace the crankshaft. Crankshaft journals can be ground to a maximum of 0.25 mm (0.01 in). Journals must be fitted with 0.25 mm (0.01 in) undersized bearings.

4. Check each main journal and crank pin for taper (A-B) and out-of-round (X-Y) as shown.
Taper

Service Limit: 0.01 mm (0.0004 in) max.

Out-of-Round

Service Limit: 0.01 mm (0.0004 in) max.