Doosan DE08TS - Crankshaft

DE08TS Diesel Engines Maintenance
2. Cam
• Cam lobe height
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
a. With an outside micrometer, measure the
camshaft journal diameter.
b. 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.
<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.
Crankshaft
1. Inspection of crankshaft
a. Defect check
• By naked eyes, check for any scratch or damage
on the crankshaft journal and crank pin.
• By means of magnetic particle test and color check,
check the crankshaft for any crack and if found,
replace it.
EA0M4066
EA0M4063
Camshaft bearing
C
A
A
BB
D
III
III
EA0M4062
43
Standard Limit
Cam lobe
Intake 49.15 48.85
height (C)
49.35
Exhaust 49.00
Cam journal
N57.86 ~N57.88 N57.52
diameter (A,B)
unit : mm
Standard Limit
0.12~ 0.17 mm 0.24 mm
Standard Limit
0.05 mm 0.2 mm