Page 542 - Foton Workshop Manual - Auman EST-M

EG - 26 Engine section – Engine (Cummins ISF3.8)

Failure phenomenon Possible reason Failure elimination

Verify the engine oil consumption rate Check the ratio between filled engine oil and mileage

Check if there is external leakage in the engine. Use the
Engine oil leaking
leakage test assembly to identify the leaking source

Check and clean the crankshaft box respirator and
Crankshaft box venting system blocked
degassing pipe

Engine oil not meeting the specification
Replace the engine oil or filter
of working condition
Engine oil replacement interval too long Verify if the interval for engine oil replacement is correct

Air compressor pumping engine oil into Check if there is carbon deposit and engine oil in the air
air system pipe

Engine oil cooler leaking Check if there is coolant leakage in the engine oil cooler
Check the engine oil level Verify if the engine oil scale
Engine oil level higher than specification calibration and oil sump capacity is correct Filling engine
Engine oil
oil to specified level
consumption too
much Check the sealing parts of turbine booster compressor and
Turbine booster seal leaking
worm

Piston ring stuck (after the overhaul of
Check the gas blowby
engine or installing the piston)

Engine oil contaminated by coolant or
Refer to engine oil contamination failure diagnosis
fuel
Valve stem clearance too big or valve
Check the valve rod and sealing part
stem oil seal broken

Cylinder valve guide pipe worn Check if the valve pipe is broken. If necessary, replace the
excessively cylinder head

Check if the piston and piston ring is broken. If necessary,
Piston or piston ring worn or broken
replace them

Separate the engine oil and check the filter to determine
Engine broken internally
the possible broken part
Analyze the engine oil to determine the contamination in
Verify if the engine oil is contaminated
the oil
Engine oil
Engine oil mixed with fuel Refer to engine oil mixing with fuel failure diagnosis
contamination
Internal coolant leaking Refer to internal coolant loss failure diagnosis

Engine oil filth too much Replace the engine oil or filter

EG-026