Use a micrometer to measure the cam lobe height and
journal diameter.
If the measured number is less than the specified limit,
the camshaft must replaced.
Cam surface
Inspect the cam face for scratch or damage.
Slight step wear or damage on the cam face may be
corrected with oil stone or oiled grinding paper. But,
replace if severely damaged.
3) Cam shaft
Clearance between camshaft journal and camshaft
bush
With an outside micrometer, measure the camshaft
journal diameter.
Measure the inside diameter of the camshaft bushing
on the cylinder block using a cylinder bore indicator,
and compare the measured value with the camshaft
outside diameter to determine the clearance.
Replace the bushing if the measured value is beyond
the specified limit.
Run-out
Support the camshaft on two V blocks and check for
run-out using a dial indicator. Correct or replace the
cam shaft if the amount of run-out is beyond the value
indicating need for servicing.
SPC000006 5ton Diesel Engine
Page 54
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