King Long XMQ6900 Series, Operating Manual

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Common trouble and elimination
6-1
Exhaust with black smoke
Possible causes Remedies
1) Intake clogged 1) heck and clean the air cleaner and intake passage.
2) Poor fuel quality 2) Use prescribed fuel.
3) Incorrect distribution timing 3) Adjust the distribution timing according to the instruction.
4) Bad atomization of injector 4) Check and repair or replace
5) The injector spray too much fuel 5) Check and adjust it accordion to the instruction.
6) Check and repair or replace 6) Check and repair leak in the pipe line and joints.
7) Faulty turbocharger 7) Check and replace the assembly.
8) middle cooler damaged and leaked 8) Repair or replace it
Exhaust with white and blue smoke
Possible causes Remedies
1) Poor quality fuel and too much water
in fuel
1) Replace the fuel.
2) Too low coolant temperature 2) Check the working temperature of the thermostat,
replace it if necessary.
3) Incorrect distribution 3) Check and adjust it.
4) Too low Pressure
4) Check the working temperature of the thermostat,
replace it if necessary.
5) Incorrect installing orientation of piston
rings 5) Check and reinstall correctly.
6) Running at low load for long time 6) Operate at proper speed and load
7) Seal ring of turbocharger worn-out 7) Check and replace it.
8) thrust bearing of turbocharger worn-out 8) Check and replace it.
9) Oil return pipe of turbocharger 9) Clean or repair it.