Page 544 - Foton Workshop Manual - Auman EST-M

EG - 28 Engine section – Engine (Cummins ISF3.8)

Failure phenomenon Possible reason Failure elimination

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

Separate the engine oil Check the engine oil filter The
Engine broken internally or internal oil
possibly broken parts include internal core hole plug, main
leaking
bearing, connecting bearing, cam bushing and rocker arm

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

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

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

Engine oil contaminated by coolant or
Refer to engine oil contamination failure diagnosis
fuel
Engine oil temperature exceeding
Check the engine oil cooler and replace it if necessary
specification

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

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

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

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

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

Engine oil cooler blocked Check the engine oil cooler

The installed oil cooler is not correct Check if the installed engine oil cooer part number is correct
Separate the engine oil and check the filter to determine the
Engine broken internally
possible broken part

EG-028