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Common trouble and elimination
C-2
Diesel engine power deficient
Possible causes
Remedies
1
)
Intake blocked
1
)
Check the air cleaner, intake pipe, and clean or replace the air
cleaner filter elements.
2
)
high exhaust back pressure
2
)
Check the valve timing, adjust it if necessary; Clean the
exhaust pipe.
3
)
Insufficient boost pressure of
turbocharged system
3
)
Check and eliminate the leakage in the pipe and joints.
4) Turbocharger is out of order;
Compressor and turbine passages are
polluted, clogged or damaged;
4) Dean or replace the compressor casing and turbine housing.
Bearing failure;
Replace it.
Carbon deposit and sludge in the
back of turbine and compressor
impellers.
Clean it.
5
)
middle cooler mangle ,leave out
5
)
Check and replace it.
6
)
Fuel line blocked or leaky
6
)
Check the seal of fuel line and fuel filter choking, or replace
screw-on filter element.
7
)
Poor atomization of injector
7
)
Check the inject pressure, remove carbon, adjust and repair
8
)
Incorrect distribution phase
8
)
Check and adjust the distribution timing and valve lash
9
)
Cylinder gasket leakage
9
)
Tighten the cylinder head bolts according to the stated torque
and order, or replace the cylinder gasket.
10
)
Bad valve sealing
10
)
Grind or replace it.
11
)
Overheat engine or too high
coolant temperature
11
)
Check and repair the radiator, thermostat, and adjust fan belt
tension.
12
)
Piston ring worn-out or broken
13
)
Sensor doesn’t work
12
)
replace it
13
)
Check and replace it.
Summary of Contents for XMQ6900J series
Page 116: ...Common trouble and elimination C 16 Fault symptom Possible cause Eliminating method speed...
Page 128: ...Appendix A 4 Air braking schematic diagram...
Page 129: ...Appendix A 4 Electric schematic diagram of the complete vehicle 1...
Page 130: ...Appendix A 4 Electric schematic diagram of the complete vehicle 2...
Page 131: ...Appendix A 4 Electric schematic diagram of the complete vehicle 3...
Page 132: ...Appendix A 4 Electric schematic diagram of the complete vehicle 4...