Common trouble and elimination
6-1
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 broken
13
）
Sensor doesn’t work
12
）
replace it
13
）
Check and replace 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...
