Doosan DE08TS - Inspection and Measurement on Major Parts; Cylinder block; Cylinder head

DE08TS Diesel Engines Maintenance
Inspection and Measurement
on Major Parts
Cylinder block
1. Clean the cylinder block thoroughly, and check for
any crack or damage.
2. If there is any crack or severe damage, replace it
and if there is minor one, correct it.
3. Check for any clogging or corrosion in the oil pas-
sage and water passage.
4. Carry out a leakage test for any crack or air leak-
ing. (Hydraulic test)
5. Plug each cylinder block’s water and oil discharge
ports, and apply the air pressure of about 4kg/cm2
to intake port and soak it in water for about 1
minute to check if there is any leakage. (Water
temperature : 70˚C)
Cylinder head
1. Cylinder head assembly & disassembly
a. Disassemble the cylinder assembly, and put it
on the shelf for assembly or clean lathe.
Try not to make any damage on the contact sur-
faces.
b. Disassemble the cotter pin, spring, spring seat
pushing valve spring by a special tool.
c. Pull out the intake and exhaust valves.
d. The disassembled parts are kept laid in turn.
e. Disassemble the valve stem seal.
f. By means of the special tool, punch, pull out a
valve guide.
2. Inspection of cylinder head
a Check for the cylinder head.
• Remove carbon from the cylinder head lower sur-
face, and then should be careful not to scratch the
surface.
• Check any crack or damage that can not found by
naked eyes through the hydraulic or magnetic
particle test.
b. Distortion of lower surface
• As shown in figure, measure the cylinder head’s
distortion at 6 directions with horizontal ruler and
clearance gauge.
• If the measured value is beyond the limit value,
correct it by means of the fine grinding paper or
grinding machine.
• If it is beyond the max. allowable value, replace
the cylinder head
(t)
A
B
C
D
E
EA3M2031
F
Compressor
the spring
EA0M4007
WARNING
37