Common trouble and elimination
C-1
Engine common trouble and its elimination (suitable for diesel engine)
Diesel engine can not start
Possible causes
Remedies
1
）
Too low starting speed
1) Check the starting system and assure the starting speed is not
lower than 110rpm.
2) Air exists in the injection system
2) Check the looseness of the joints of the feed line. Unscrew
the de-aeration bolt on the fuel cleaner and oil water separator
assembly, then press fuel with hand priming pump until the fuel
overflows without air bubbles.
3) Fuel pipe clogged
3) Determine the location of the clog and clear it.
4) Fuel filter choked
4) Replace the screw-on filter element of the fuel filter/oil-water
separator assembly.
5) Fuel supply pump does not apply
fuel or applies fuel irregularly
5) Check for leakage in the fuel inlet pipe
Clogging of the fuel supply pump filters and fix or replace.
6) Insufficient fuel injection, without
fuel injection or low injection pressure
6) Check the injector atomization situations and replace a new
one if it doesn’t work.
7) Starting system problems:
7) Check the connection to be correct and reliable.
Incorrect terminals connection or bad
contact;
Insufficient battery charge;
Charge the battery.
Bad contact between the brush and
communicator of the starter
Repair or replace the brush and clean the surface of the
communicator with soft sand paper and blow off.
8) Insufficient compression pressure;
8) Replace the piston ring and press in the cylinder sleeve if
necessary.
Piston ring worn-out
9) The fuel cut off solenoid valve joint
is loose, dirty or corroded smudginess
canker
10) Mounting timing incorrect
9) Check the valve clearance, valve spring, valve stem, and
valve seat. Grind the valve seat if necessary.
Tighten and wash or replace.
10) Check and adjust 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...
