Doosan GV158TIC, Operation & Maintenance Manual

Page: 62 / 162

Disassembly and Reassembly of Major Components - 56 -
3.2. Measurement and Inspection of Major Parts
3.2.1. Cleaning and inspection of cylinder block
●
Clean the cylinder block and inspect it for any crack or damaged.
●
Inspect the oil passage and water passage for any clog and erosion.
●
By performing the hydraulic test, inspect for any leaks. With plugging the water and oil passages of
cylinder block, put in the air of 5 kg/cm
2 pressure in the Inlet port of cylinder block and then soak the
cylinder block in the water for about 1 minute to check for any leaks.(water temperature: 70°C)
●
Inspect the cylinder block's camshaft bush to any damage and the alignment of oil supply holes and
if abnormal, replace it.
3.2.2. Cylinder liner measurement
●
Assemble the cylinder liner at the cylinder
block and measure inner diameters at
upper, middle, lower 3 levels by 45° inter-
val and calculate the average values after
eliminating the max. and min. values.
●
If the measured values are very close to
the limit value or beyond, replace it.
3.2.3. Cylinder head
1) Cylinder head disassembly
●
Be careful for the cylinder head gasket
contacting surface of cylinder head
not to be damaged.
●
Remove the cotter pin pressing the
valve spring by means of a special
tool.
●
Take out the valve stem seal.
●
Pull out the intake and exhaust valves.
EA3M2043
20mm
Liner
inner dia.
Standard Limit
ø
127.990 ~
ø
128.010 mm
0.15 mm
Valve spring
compressor
EA0M4007