Crankshaft, Inspection
The crankshaft is induction hardened
.
Inspect the crankshaft very carefully to avoid unnec-
essary overhaul.
The following applies when the need for overhaul is
checked:
1
Clean the crankshaft carefully.
Measure the bearing journals' out-of-round, wear
and taper. Refer to
Technical Data page 27
for
specifications.
2
Check whether there is any surface damage on
the bearing journals. If there is any damage on
the surface layer, the shaft must be re-ground.
3
Place the shaft pair of V-blocks, under 1st and 7th
main bearing journals. Alternatively, hold the
crankshaft between the two centers.
4
Measure crankshaft axial displacement (throw)
on the 4th main bearing.
For maximum permissible values, refer to
Tech-
nical Data page 27
.
IMPORTANT!
Crankshaft straightening is not permitted.
5
Check for cracks before and after any grinding.
Magnetic powder testing is used for this test, i.e.
fluorescent powder which is viewed under ultra-
violet light.
21-6 Crank Mechanism
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