Crankshaft: Testing and Inspection
CRANKSHAFT INSPECTION1. Install the main bearing cap.
2. Measure the crankshaft end play.
^ If it exceeds the specification, replace the thrust bearing or crankshaft so that the specified end play is obtained.
Crankshaft standard end play
0.22-0.45 mm (0.009-0.017 in)
Crankshaft maximum end play
0.55 mm (0.022 in)
3. Remove the main bearing cap.
4. Measure the crankshaft runout.
^ If it exceeds the specification, replace the crankshaft.
Maximum main journal runout
0.05 mm (0.001 in)
5. Measure the journal diameter in X and Y directions at the two points (A and B) as indicated in the figure.
^ If it exceeds the specification, replace the crankshaft or grind the journal and install the undersize bearing.
Main journal diameter
STD: 51.980-52.000 mm (2.0465-2.0472 in)
US 0.25: 51.730-51.750 mm (2.0367-2.0374 in)
Maximum main journal off-round
0.005 mm (0.0001 in)
Crank pin diameter
STD: 51.980-52.000 mm (2.0465-2.0472 in)
US 0.25: 51.730-51.750 mm (2.0367-2.0374 in)
Maximum crank pin off-round
0.005 mm (0.0001 in)
6. Install the main bearing caps and crankshaft.
7. Position a plastigauge atop the journals in the axial direction.
8. Install the main bearing caps and cylinder block.
9. Remove the main bearing caps.
10. Measure the main journal oil clearance.
^ If it exceeds the specification, replace the main bearing using the main bearing selection table or grind the main journal and install the oversize bearings so that the specified oil clearance is obtained.
Main journal standard oil clearance
0.016-0.046 mm (0.0007-0.0018 in)
Main journal maximum oil clearance
0.10 mm (0.0039 in)
Main bearing size
STD: 2.501-2.529 mm (0.09847-0.09956 in)
OS0.25: 2.623-2.630 mm (0.1033-0.1035 in)