Crankshaft Bearing Inspection

1. Clean crankshaft and blow out oil passages.





2. Support crankshaft front and rear bearing journals on V-blocks, and using a DTI (Dial Indicator), measure run-out on center main bearing.
Maximum permitted run-out: 0.08 mm.
If run-out exceeds permitted maximum, crankshaft is unsuitable for regrinding and should be replaced.





3. Measure each journal for overall wear and ovality.
Main bearing journal diameter: 63.487 to 63.500 mm
Maximum out of round: 0.040 mm.
Connecting rod bearing journal diameter: 55.500 to 55.513 mm
Maximum out of round: 0.040 mm.
If measurements exceed permitted maximum, regrind or install new crankshaft.

NOTE:
^ Ovality checks should be made at 120° intervals around each journal.
^ Crankshaft main and connecting rod bearings are available in 0.254 mm and 0.508 mm oversizes.





Crankshaft dimensions:
Bearing journal radius-all journals except rear main journal:
A: 1.90 to 2.28 mm.
Rear main bearing journal radius B: 3.04 mm.
Bearing journal diameter C:
Standard: 63.487 to 63.500 mm.
0.254 mm undersize: 63.233 to 63.246 mm.
0.508 mm undersize: 62.979 to 62.992 mm.
Bearing journal width D:
Standard: 26.975 to 27.026 mm.
0.254 mm undersize: 26.975 to 27.026 mm.
0.508 mm undersize: 27.229 to 27.280 mm.
Bearing journal diameter E:
Standard: 55.500 to 55.513 mm.
0.254 mm undersize: 55.246 to 55.259 mm.
0.508 mm undersize: 54.992 to 55.005 mm.
4. Check crankshaft pilot bearing for wear, renew if necessary.
Pilot bearing inside diameter: 19.177 +0.025 -0.000 mm