Crankshaft Inspection

Crankshaft Inspection

Out-of-Round and Taper

1. Remove the crankshaft from the engine block. Crankshaft and Piston Removal

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

3. Clean the keyway and threads, and check for damage.

4. Measure the 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.





5. 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.










Straightness

6. Place the engine block on the surface plate.

7. Clean and install the bearings on the No. 1 and the No. 5 journals of the engine block.

8. Lower the crankshaft into the block.

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