Mitsubishi 6M70 Workshop Manual page 102

CRANKSHAFT AND CRANKCASE
11-92
(2) Main bearing oil clearance
• Fit the upper main bearing into the crankcase and the lower
main bearing into the main bearing cap.
• Tighten the bolts to a torque of 100 N·m {10 kgf·m}.
• Measure the inner diameter of the main bearing and the outer di-
ameter of the corresponding crankshaft journal.
• If the difference between the measurements exceeds the speci-
fied limit, machine the crankshaft journal to one of the specified
undersize dimensions.
Inspection: Crankshaft
(1) Bend
• Measure the crankshaft at the center journal for bend while sup-
porting the shaft at the end journals.
• A half of the dial gauge reading obtained as the crankshaft is ro-
tated by a full turn represents the bend of the crankshaft.
• If the measurement exceeds the limit, replace the crankshaft.
(2) Roundness and cylindricity of crankshaft journals and
pins
• If any of the measurements exceeds the limits, grind the crank-
shaft journal(s) and/or pin(s) to undersize(s) or replace the
crankshaft.