Crankshaft Inspection

Out-of-Round and Taper


1.Remove the crankshaft from the cylinder block.

2.Clean the crankshaft oil passages with pipe cleaners or suitable brush.

3.Clean 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 (New): 0.005 mm (0.0002 in.) max. 
Service Limit: 0.010 mm (0.0004 in.) 

 

5.Measure taper at the edges of each rod and main journal. The difference between measurement on each journal must not be more than the service limit.

Journal Taper:
Standard (New): 0.005 mm (0.0002 in.) max. 
Service Limit: 0.010 mm (0.0004 in.) 

Straightness


6.Place the cylinder block on the surface plate.

7.Clean and install the bearings on the No. 1 and No. 5 journal of the cylinder block.

8.Lower the crankshaft into the block.

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

Crankshaft Total Runout:
Standard (New): 0.03 mm (0.0012 in.) max. 
Service Limit: 0.04 mm (0.0016 in.)