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. Check the keyway and threads.
4. Measure for an out-of-round condition at the middle of each rod and main journal at two locations in a cross-pattern. 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: Identifying Journal Out-Of-Round

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Measure 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 

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.

   Crankshaft Total Runout 

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

   Service Limit: 0.030 mm (0.0012 in.) 

   Fig 2: Checking Crankshaft Total Runout

   Courtesy of AMERICAN HONDA MOTOR CO., INC.