General Information

CHECKING CRANKSHAFT TOLERANCES
Clean the crankshaft and measure the crankpins and journals using a micrometer. Measurements should be made at several points around the circumference. Journal and crankpin out-of-round (ovality) should not exceed 0.05 mm (0.0020 inch). If the measured values are close to or exceed this limit, the crankshaft must be ground down to the specified undersize. Journals and crankpins can be ground down to the first undersize without rehardening. Beyond that the shaft will need to be hardened by means of Tenifer treatment.

Check whether the shaft is distorted as follows. Mount the crankshaft in two V-blocks, position the indicator plunger against the journal for the middle (No. 3) main bearing and rotate the shaft. Maximum permissible deflection is 0.10 mm (0.0040 inch).