Page 467 - Foton Workshop Manual - Auman EST-M
P. 467
Diagnosis - Mechanical fault diagnosis DI - 413
Failure phenomenon Possible reason Failure elimination IN
Check the intake pipe If the air
Resistance between the intake system compressor inlet is connected to the DI
and air compressor too big intake system of vehicle or equipment,
check the intake resistance of engine
Air system leaking Check if the air system leaks EG
Air compressor pressure going up
Air pressure regulator failed or setup not Check if the air regulator is working
slowly
correct normally
TR
Check if there is carbon deposit If
Carbon deposit too much in the exit
necessary, replace the air outlet pipe of
pipe, downstream air valve or
air compressor and cylinder head AX
compressor cylinder head
assembly
Check the check valve, air dryer and
Air system parts failed
other parts FR
Air compressor pressure going up Check the sealing parts of unloading
Unloading valve failed
slowly valve and valve body
ST
Air compressor intake or exhaust system Check the assembly of air compressor
leaking cylinder head. If necessary, replace it
Verify if the interval for engine oil BR
Engine oil replacement interval too long
replacement is correct
Refer to engine oil contamination failure
Engine oil contaminated by coolant BW
diagnosis
Resistance between the intake system Replace the air compressor and check
and air compressor too big the intake pipe EL
Scale deposit in the system gas reservoir
Exhaust the air reservoir tank everyday
tank
Carbon deposit too much in the exit Check if there is carbon deposit If
pipe, check valve or compressor necessary, replace the air outlet pipe of
cylinder head air compressor
The curvature of characteristic
curve when the engine is running Refer to engine specification list
Air compressor pumping excessive exceeds the specification
engine oil into air system Crankshaft box pressure too high Check if the gas blowby is too much
Engine oil pressure exceeding
Check the engine oil pressure
specification
Check if the coolant temperature is too
Air compressor running overheated
high
Check the air compressor and the oil
Engine oil return pipe blocked return hole of engine oil in the driving
accessorary
Air compressor drive gear or engine Check the drive gear and gear system.
gear system worn or broken Repair them if necessary
Check if the air compressor works
Air compressor pump pressure too high
properly
Air compressor worn excessively or
Replace or reinstall the air compressor
broken inside
DI-413
