Doosan AD158TI, Operation & Maintenance Manual

Page: 81 / 294

Disassembly and assembly of major components - 75 -
6.2. Inspection
6.2.1. Cylinder block
1) Clean the cylinder block thoroughly and check a visual inspection for cracks or damage.
2) Replace if cracked or severely damaged, and correct if slightly damaged.
3) Check the oil and water passing lines for restriction or corrosion.
4) Inspect the cylinder block
′ s camshaft bush to any damage and the alignment of oil supply holes and if
abnormal or severe wears, replace it.
5) Make a hydraulic test to check for any cracks or air leaks.
Hydraulic test :
Stop up each outlet port of water and oil passages in the cylinder block, apply air pressure of about 5 kg/cm 2
against the inlet ports, then immerse the cylinder block in water for about 1 minute to check any leaks. (Water
temperature: 70°C)
6.2.2. Cylinder liner measurement
●
Assemble the cylinder liner at the cylinder
block and measure inner diameter at upper,
middle, lower that is, 3 steps by 45° interval
and calculate the average values after elim-
inating the maximum and minimum values.
●
If the measured values are very close to the
limit value or beyond, replace it.
6.2.3. Cylinder head
●
Carefully remove carbon from the lower face of the cylinder head using nonmetallic material to prevent
scratching of the valve seat faces.
●
Check the entire cylinder head for very fine cracks or damage invisible to ordinary sight using a hydraulic
tester or a magnetic flaw detector.
EFM2032I
Liner
inner dia.
Standard Limit
ø127.990 ~
ø128.010 mm
ø128.16 mm