King Long XMQ6127J series, Operating Manual

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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.