Page 483 - Foton Workshop Manual - Auman EST-M

Diagnosis - Mechanical fault diagnosis DI - 429

Failure phenomenon Possible reason Failure elimination IN

Piston cooling nuzzle broken or installed Check if the piston cooling nuzzle is broken and
DI
incorrectly if it is correctly installed

Separate the engine oil Check the engine oil filter
EG
Engine broken internally or internal oil The possibly broken parts include internal core

leaking hole plug, main bearing, connecting bearing, cam
bushing and rocker arm TR

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

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

Engine oil pressure low Fuel grade not meeting the application or
Use high quality fuel to run the engine
fuel quality too bad ST

Coolant temperature lower than Refer to coolant temperature lower than normal
BR
specification value failure diagnosis

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

Engine oil temperature exceeding Check the engine oil cooler and replace it if
EL
specification necessary

Crankshaft box pressure too high Check if the gas blowby is too much

Exhaust system resistance higher or lower
Check if the exhaust system is blocked
than specification

Coolant temperature higher than Refer to coolant temperature higher than normal
specification value—graually too hot failure diagnosis

Engine oil level higher or lower than Check the engine oil level. If necessary, fill in or
specification discharge the engine oil

Engine oil temperature switch, Check if the engine oil temperature switch,
thermometer or sensor failed or in wrong engine oil thermometer or engine oil temperature
Engine oil temperature
higher than specification position sensor work well and the positions are correct
Engine oil cooler blocked Check the engine oil cooler

Check if the installed engine oil cooer part
The installed oil cooler is not correct
number is correct

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

DI-429