B2300 Regular Cab 2WD L4-2.3L VIN A (1997)
Crankshaft Main Bearing: Testing and Inspection
Oil Clearance
1. Remove any foreign material and oil from the journals and bearings.
2. Install the upper main bearings and thrust bearing
3. Install the lower main bearings into the main bearing caps.
4. Install the crankshaft into the cylinder block.
5. Position Plastigage atop the journals in the axial direction.
6. Apply clean engine oil to the threads and seat faces of the main bearing cap bolts.
7. Install the main bearing cap.
8. Lightly oil main bearing bolt or stud. Alternately tighten to 68-81 Nm (50-60 ft. lbs.). Retighten to 102-115 Nm (75-85 ft. lbs.). Remove the main
bearing cap.
10. Measure the Plastigage at each journal at the widest point for the smallest clearance, and the narrowest point for the largest clearance.
Oil Clearance
Number One Main Bearing:
Standard: 0.010-0.054 mm (0.0004-0.0021 in)
Maximum: 0.054 mm (0.0021 in)
Number Two to Five Main Bearings:
Standard: 0.020-0.064 mm (0.0008-0.0025 in)
Maximum: 0.064 mm (0.0025 in)
11. If the oil clearance exceeds the maximum, grind the crankshaft and install undersize bearings.
