Crankshaft Inspection

Out-of-Round and Taper 

1. Remove the crankshaft from the engine block (see CRANKSHAFT AND PISTON REMOVAL ).
2. Clean the crankshaft oil passages with pipe cleaners or a suitable brush.
3. Clean the keyway slot and threaded holes for damage.
4. Measure the out-of-round at the middle of each rod and the 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 (0.00020 in) max. 

   Service Limit: 0.010 mm (0.00039 in) 

   Fig 1: Identifying Journal Out-Of-Round

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Measure the taper at the edges of each rod and the main journal. The difference between measurements on each journal must not be more than the service limit.

   Journal Taper 

   Standard (New): 0.005 mm (0.00020 in) max. 

   Service Limit: 0.010 mm (0.00039 in) 

   Straightness 

6. Place the V-blocks on a flat surface.
7. Check the total runout with the crankshaft supported on V-blocks.
8. 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.
   Fig 2: Measuring Crankshaft Total Runout

   Courtesy of AMERICAN HONDA MOTOR CO., INC.

   Crankshaft Total Runout 

   Standard (New): 0.03 mm (0.0012 in) max. 

   Service Limit: 0.04 mm (0.0016 in)