Common trouble and elimination
6-1
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 XMQ6900 Series
Page 19: ...Operation Instruction 3 1 Figure 17 Set MotPPR Figure 18 Clear Trip A Figure 19 Clear Trip B...
Page 31: ...Operation Instruction 3 3 CC350 355 series A C Operation...
Page 32: ...Operation Instruction 3 3...
Page 33: ...Operation Instruction 3 3...
Page 34: ...Operation Instruction 3 3...
Page 35: ...Operation Instruction 3 3...
Page 44: ...Operation Instruction 3 4 1 9 Retarder operation...
Page 45: ...Operation Instruction 3 4 Section 1 1 2 1 10 Stopping parking...
Page 49: ...Operation Instruction 3 4 1 14 1 Emergency operation...
Page 50: ...Operation Instruction 3 5 WABCO ABS BASIC INTRODUCTION...
Page 51: ...Operation Instruction 3 5...
Page 52: ...Operation Instruction 3 5...
Page 53: ...Operation Instruction 3 5...
Page 54: ...Operation Instruction 3 5...
Page 55: ...Operation Instruction 3 6 ECAS System Introduction for tourist bus use 1 System introduction...
Page 56: ...Operation Instruction 3 6 3 System function...
Page 57: ...Operation Instruction 3 6...
Page 169: ...Appendix 7 6 Air braking schematic diagram...
Page 170: ...Appendix 7 7 Electric schematic diagram of the complete car 1...
Page 171: ...Appendix 7 7 Electric schematic diagram of the complete car 2...
Page 172: ...Appendix 7 7 Electric schematic diagram of the complete car 3...
Page 173: ...Appendix 7 7 Electric schematic diagram of the complete car 4...
