Crankshaft journal Taper Measurement Procedure

1. Using an outside micrometer, measure the journal at the extreme front (A) and rear (B) of the journal parallel to the crankshaft centerline.
2. Subtract the smallest from the largest measurement. The result will be the journal taper.
3. If the main bearing journal taper exceeds 0.004 mm (0.00016 in.), replace the crankshaft.
4. If the crankpin journal taper exceeds 0.005 mm (0.0002 in.), replace the crankshaft.
5. If the crankshaft journals are damaged or worn beyond dimensions, replace the crankshaft. No machining of the crankshaft journals is allowed.