Crankshaft Inspection

Out-of-Round and Taper 

1. Remove the crankshaft from the engine block (see CRANKSHAFT AND PISTON REMOVAL ).
2. Remove the CKP pulse plate from the crankshaft (see CKP PULSE PLATE REPLACEMENT ).
3. Clean the crankshaft oil passages with pipe cleaners or a suitable brush.
4. Check the keyway slot and the threaded holes for damage.
5. 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 (0.0002 in.) max. 

   Service Limit: 0.010 mm (0.0004 in.) 

   Fig 1: Measuring Out-Of-Round At Middle Of Each Rod And Main Journal

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Measure the taper at the edges 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): 0.005 mm (0.0002 in.) max. 

   Service Limit: 0.010 mm (0.0004 in.) 

   Straightness 

7. Place the V-block on a flat surface.
8. Check the total runout with the crankshaft supported on V-blocks.
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.

   Crankshaft Total Runout 

   Standard (New): 0.025 mm (0.0010 in.) max. 

   Service Limit: 0.030 mm (0.0012 in.) 

   Fig 2: Measuring Crankshaft Total Runout

   Courtesy of AMERICAN HONDA MOTOR CO., INC.