Check that there are no deposits or blockages in the crankshaft
lubrication ducts.
Check that the diameter of the main journals corresponds to the
recommended gures.
Main journal diameter
Category A 59.994 ÷ 60.000 mm
Category B 59.988 ÷ 59.994 mm
Category C 59.982 ÷ 59.988 mm
If the diameter of the main journals is not correct, they should be
reground to the recommended undersize.
Main journal diameter undersize
0.127 mm
Crankpin undersizes higher than the value mentioned will ad-
versely aect the structural resistance of the crankshaft (fol-
lowing contact between the tool and rolled connectors). As
far as the above is concerned, if the regrinding requires under
sizes greater than 0.127 mm, then the crankshaft must be re-
placed and a new one ordered from the parts dept.
Check that the diameter of the crank pins corresponds to the rec-
ommended gures.
Crankpin diameter
Category A 50.779 ÷ 50.805 mm
Category B 50.793 ÷ 50.799 mm
Category C 50.787 ÷ 50.793 mm
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