Page 529 - Foton Workshop Manual - Auman EST-M

Engine section – Engine (Cummins ISF3.8) EG - 13

IN

Failure phenomenon Possible reason Failure elimination
DI
Air system parts failed Check the check valve, air dryer and other parts

Check the sealing parts of unloading valve and valve
Air compressor pressure Unloading valve failed EG
body
going up slowly

Air compressor intake or exhaust system Check the assembly of air compressor cylinder head.
leaking If necessary, replace it TR

Verify if the interval for engine oil replacement is
Engine oil replacement interval too long
correct AX
Engine oil contaminated by coolant Refer to engine oil contamination failure diagnosis
Resistance between the intake system and Replace the air compressor and check the intake FR
air compressor too big pipe

Scale deposit in the system gas reservoir ST
Exhaust the air reservoir tank everyday
tank
Carbon deposit too much in the exit pipe, Check if there is carbon deposit If necessary, replace BR
check valve or compressor cylinder head the air outlet pipe of air compressor

The curvature of characteristic curve when BW
Air compressor pumping
the engine is running exceeds the Refer to engine specification list
excessive engine oil into
specification
air system EL
Crankshaft box pressure too high Check if the gas blowby is too much

Engine oil pressure exceeding specification Check the engine oil pressure

Air compressor running overheated Check if the coolant temperature is too high

Check the air compressor and the oil return hole of
Engine oil return pipe blocked
engine oil in the driving accessories

Air compressor drive gear or engine gear Check the drive gear and gear system. Repair them

system worn or broken if necessary

Air compressor pump pressure too high Check if the air compressor works properly

Air compressor worn excessively or broken
Replace or reinstall the air compressor
inside

Carbon deposit too much in the exit pipe, Check if there is carbon deposit If necessary, replace
downstream air valve or compressor the air outlet pipe of air compressor and cylinder
cylinder head head assembly

Air compressor installation mechanism
Check the installation mechanism of air compressor
loose, worn or broken
Air compressor too noisy Spline drive coupling or gear worn
Check if the coupling is worn
excessively

Air compressor drive gear or engine gear Check the drive gear and gear system. Repair them

system worn or broken if necessary

Air compressor worn excessively or broken
Replace or reinstall the air compressor
inside

EG-013