Crankshaft: Service and Repair
CRANKSHAFT AND CRANKSHAFT BEARINGCrankshaft and Piston:
1. Clean the crankshaft completely, and check it for cracks using liquid penetrant tester. Replace if faulty.
2. Measure the bend of crankshaft. If it exceeds the limit, repair or replace it.
NOTE: If a suitable V-block is not available, install #1 and #5 crankshaft bearing on cylinder block, position the crankshaft on these bearings, and then measure the crankshaft bend using a dial gauge.
3. Inspect the crank journal and crank pin for wear. If they are not within the specification, replace the bearing with a suitable (undersize) one, and replace or readjust crankshaft as necessary. When grinding the crank journal or crank pin, finish them to the specified dimensions according to the undersize bearing to be used.
4. Measure the thrust clearance of crankshaft at center bearing. If clearance exceeds the standard, replace the bearing.
5. Inspect individual crankshaft bearings for signs of flaking, seizure, melting and wear.
6. Measure the oil clearance on each crankshaft bearing using plastigauge. If the measured value is out of standard, replace the defective bearing with an undersize one, and replace or recondition the crankshaft as necessary.
Crankshaft oil clearance:
Standard: 0.010 - 0.030 mm (0.0004 - 0.0012 inch)