Crankshaft Inspection

Crankshaft Inspection
Out-of-Round and Taper
1. Remove the crankshaft from the engine block.
2. Clean the crankshaft oil passages with pipe cleaners or a suitable brush.
3. Check the keyway and threads.





4. Measure out-of-round at the middle of each rod and main journal in two places. The difference between measurements on each journal must not be more than the service limit.
Journal Out-of-Round
Standard (Now): 0.0040 mm (0.00016 inch) max.
Service Limit: 0.010 mm (0.0004 inch)
5. Measure taper at the edge of each rod and main journal. The difference between measurements on each journal must not be more than the service limit.
Journal Taper
Standard (New): 0.0025 mm (0.000098 inch) max.
Service Limit: 0.006 mm (0.0002 inch)

Straightness
6. Place the engine block on the surface plate.
7. Clean and install the bearings on the No. 1 and No. 4 journal of the engine block.
8. Lower the crankshaft into the engine block.





9. Measure the runout on all of the main journals. Rotate the crankshaft two complete revolutions. The difference between measurements on each journal must not be more than the service limit.