Doosan GL08K, Operation & Maintenance Manual

Page: 67 / 206

Maintenance - 61 -
3.2. Inspection and Measurement on Major Parts
3.2.1. Cylinder block

Clean the cylinder block thoroughly, and check for any crack or damage.

If there is any crack or severe damage, replace it and if there is minor one, correct it.

Check for any clogging or corrosion in the oil passage and water passage.

Carry out a leakage test for any crack or air leaking. (Hydraulic test)

Plug each cylinder block’s water and oil discharge ports, and apply the air pressure of about 4 kg/cm
2
to intake port and soak it in water for about 1 minute to check if there is any leakage. (Water
temperature : 70 °C)
3.2.2. Cylinder head
1) Cylinder head assembly & disassembly
a) Disassemble the cylinder assembly, and put it on the shelf for assembly or clean lathe.
CAUTION :
Prevent any damage to gasket's contact surface of the cylinder head.
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.
Compress
the spring
EA0M4007
EA5M3018