QUANCHAI N485D, Maintenance Manual

Page: 130 / 139

ANHUI QUANCHAI ENGINE CO., LTD
18. High engine oil consumption
Check conditions:
1) Engine flameout
Seque
nce
No.
Position
tested
Normal Abnormal
1 Engine oil The grade of the engine oil is CD or above.
The viscosity of engine oil is too
low and too high, which affects
lubrication.
2
Piston and
cylinder liner
The dimensions of the piston and the
cylinder liner are within the allowable
tolerance range. The piston and the cylinder liner
wear severely and leak engine oil,
increasing engine oil consumption.
3 Piston ring
The dimensional tolerance is within the
allowable tolerance range.
The upper and lower parts of the
gas ring are installed reversely,
causing excessive wear and engine
oil leakage.
4 Oil seal The oil seal is not worn or damaged.
The front and rear oil seals of the
crankshaft leak engine oil, causing
extra engine oil loss.
5 Oil pan gasket
The oil pan gasket is in good condition
without leakage.
The junction surface of the oil pan
and other sealing positions leak
fuel, increasing fuel consumption.