Crankshaft Inspection

Crankshaft Inspection

Crankshaft Runout
Using a dial gauge, measure runout at center journal. Rotate crankshaft slowly. If runout exceeds its limit, replace crankshaft.
Crankshaft runout
Limit: 0.06 mm (0.0023 in.)





Crankshaft Thrust Play
Measure this play with crankshaft set in cylinder block in the normal manner, that is, with thrust bearing, lower crankcase, main bearings and main bearing caps installed.

Use a dial gauge to read displacement in axial (thrust) direction of crankshaft.

If its limit is exceeded, replace thrust bearing with new standard one or oversize one to obtain standard thrust play.

Crankshaft thrust play
Standard: 0.10 - 0.35 mm (0.0040 - 0.0137 in.)
Limit: 0.38 mm (0.0150 in.)





Thickness of crankshaft thrust bearing
Standard: 2.425 - 2.475 mm (0.0955 - 0.0974 in.)
Oversize (0.125 mm): 2.488 - 2.538 mm (0.0980 - 0.0999 in.)








Out-of-Round and Taper (Uneven Wear) of Journals
An unevenly worn crankshaft journal shows up as a difference in diameter at a cross section or along its length (or both). This difference, if any, is determined by taking micrometer readings. If any one of journals is badly damaged or if amount of uneven wear in the sense explained above exceeds its limit, regrind or replace crankshaft.

Crank journal out-of-round (a - b) and taper (c - d)
Limit: 0.01 mm (0.0004 in.)