Page 481 - Foton Workshop Manual - Auman EST-M

Diagnosis - Mechanical fault diagnosis DI - 427

Failure phenomenon Possible reason Failure elimination IN

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

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

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

Engine oil not meeting the specification
Replace the engine oil or filter AX
of working condition

Verify if the interval for engine oil replacement is
Engine oil replacement interval too long FR
correct

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

Check if there is coolant leakage in the engine oil
Engine oil cooler leaking BR
cooler

Engine oil consumption too Check the engine oil level Verify if the engine oil
BW
much Engine oil level higher than specification scale caliberation and oil sump capacity is correct
Filling engine oil to specified level

Check the sealing parts of turbine booster EL
Turbine booster seal leaking
compressor and worm
Piston ring stuck (after the overhaul of
Check the gas blowby
engine or installing the piston)

Refer to engine oil contamination failure
Engine oil contaminated by coolant or fuel
diagnosis

Valve stem clearance too big or valve stem
Check the valve rod and sealing part
oil seal broken

Cylinder valve guide pipe worn Check if the valve pipe is broken. If necessary,

excessively replace the cylinder head

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

Separate the engine oil and check the filter to
Engine broken internally
determine the possible broken part

Analyze the engine oil to determine the
Verify if the engine oil is contaminated
contamination in the oil
Refer to engine oil mixing with fuel failure
Engine oil contamination Engine oil mixed with fuel
diagnosis
Internal coolant leaking Refer to internal coolant loss failure diagnosis
Engine oil filth too much Replace the engine oil or filter

DI-427