Page 484 - Foton Workshop Manual - Auman EST-M

DI - 430 Diagnosis - Mechanical fault diagnosis

Failure phenomenon Possible reason Failure elimination

Check bulk coolant Replace with undefiled
Bulk coolant is contaminated coolant after discharging coolant completely
Replace the coolant filter

Engine oil cooler failed Check the engine oil cooler
Cylinder head gasket leaking Check the cylinder heand gasket
Coolant mixed with engine
Perform the pressure test for the cylinder head
oil
Cylinder head cracked or with holes and cooling system. Check the internal coolant
leakage

Air compressor cylinder head cracked Check the cylinder heand and gasket of air
or with holes or gasket leaking compressor
Cylinder body cracked or with holes Check the cylinder body

Check if there is leakage in all the pipelines and
Engine oil pipe leaking pipe joint. Tighten the loose pipe joints. If
necessary, replace the leaking engine oil pipeline

Dismount the oil return pipe of turbine booster to
The return oil pipe of turbine booster is
check if it is blocked Clean and replace the
blocked
engine oil return pipe

Ceck and clean the crankshaft box respirator and
Crankshaft box venting system blocked
degassing pipe
Dismount the intake and exhaust pipes and check
Engine oil getting into turbine booster
if there is engine oil or fuel

Turbine booster leaking Intake system resistance exceeding Check the intake system resistance. If necessary,
technical specification clean or replace the air filter and intake pipe

Exhaust system resistance not meeting
Check the resistance of exhaust system
specification

Check the sealing parts of turbine booster
Turbine booster seal leaking
compressor and worm
Check the radial and axial clearances of bearing
The impeller of turbin booster exceeds the
Check the turbine booster. If necessary, repair or
specification
replace the turbine booster

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

DI-430