Page 92
TROUBLESHOOTING
LOW POWER
Low power complaints may result from many
factors other than an engine problem. Be sure to
check the chassis and trailer for dragging brakes
and assess the drivetrain combination for
driveability and application (engine-rated bhp,
transmission and rear-axle ratios, tire sizes, etc.).
ENGINE WILL NOT ACHIEVE NO-LOAD GOVERNED RPM
Possible Cause
Correction
1. Code(s) present.
1. Correct cause of code(s).
2. EGR valve-to-cooler pipe cracked or bellows
leaking. Causes low boost pressure.
2. Inspect EGR valve-to-cooler pipe and correct or replace leaking
component(s).
3. EGR valve sticking open. Causes low boost
pressure, poor performance.
3. Inspect EGR valve components for carbon fouled, soot buildup or
corrosion. Replace valve to correct.
4. Intercooler cracked or leaking.
4. Inspect intercooler, pressure-test, and repair or replace as
required.
5. Plugged fuel tank vents.
5. Clean the fuel tank vents.
6. Restrictions in the air intake system such as
clogged air filter(s).
6. Check for restrictions in the air intake system. Check the air
pressure in the air intake manifold. Replace the air filter and make
necessary repairs to the air intake system.
7. Poor quality fuel.
7. Drain fuel tank(s), clean system and replace fuel filters. Fill tank
with MACK-specified diesel fuel. Bleed system.
8. Low fuel pressure.
8. Check for sufficient fuel in the fuel tank. Check fuel filters (including
the pre-pump filter screen, if so equipped), replace if necessary.
Check fuel supply lines for restrictions or air in the system. Check
fuel return check valve for free-moving poppet. Check fuel
pressure and repair or replace supply pump as required.
9. Improper valve lash adjustment.
9. Adjust valve lash to specified clearance.
10. Fuel-injection nozzle failure.
10. Repair or replace defective nozzle. Refer to item 8 in ENGINE
MISFIRES — NO CODE(S) chart.
11. Turbocharger dirty or malfunctioning.
11. Inspect turbocharger. Clean, repair or replace as required.
12. Exhaust restriction.
12. Check for restrictions in the exhaust system.
13. Low compression.
13. Check items listed under LOW COMPRESSION.
14. Restrictions in intercooler.
14. Perform restriction pressure test. Clean any restrictions.
15. Restrictions in intercooler inlet/outlet tubes.
15. Disconnect tubing and clean restrictions.
16. Air cleaner-to-hood boot.
16. Check that the boot clamp on the air cleaner housing is tight, and
that the boot is making full contact with the hood and has not
collapsed.
Possible Cause
Correction
1. Code(s) present.
1. Correct cause of code(s).
5-111.bk Page 92 Monday, July 10, 2006 2:26 PM
Содержание ASET AC
Страница 6: ...TABLE OF CONTENTS Page iii TABLE OF CONTENTS 5 111 bk Page iii Monday July 10 2006 2 26 PM...
Страница 14: ...INTRODUCTION Page 1 INTRODUCTION 5 111 bk Page 1 Monday July 10 2006 2 26 PM...
Страница 23: ...Page 10 NOTES 5 111 bk Page 10 Monday July 10 2006 2 26 PM...
Страница 24: ...VISUAL IDENTIFICATION Page 11 VISUAL IDENTIFICATION 5 111 bk Page 11 Monday July 10 2006 2 26 PM...
Страница 28: ...DESCRIPTION AND OPERATION Page 15 DESCRIPTION AND OPERATION 5 111 bk Page 15 Monday July 10 2006 2 26 PM...
Страница 96: ...COMPONENT LOCATOR Page 83 COMPONENT LOCATOR 5 111 bk Page 83 Monday July 10 2006 2 26 PM...
Страница 99: ...Page 86 NOTES 5 111 bk Page 86 Monday July 10 2006 2 26 PM...
Страница 100: ...TROUBLESHOOTING Page 87 TROUBLESHOOTING 5 111 bk Page 87 Monday July 10 2006 2 26 PM...
Страница 140: ...MAINTENANCE Page 127 MAINTENANCE 5 111 bk Page 127 Monday July 10 2006 2 26 PM...
Страница 153: ...Page 140 NOTES 5 111 bk Page 140 Monday July 10 2006 2 26 PM...
Страница 154: ...REPAIR INSTRUCTIONS PART 1 Page 141 REPAIR INSTRUCTIONS PART 1 5 111 bk Page 141 Monday July 10 2006 2 26 PM...
Страница 383: ...Page 370 NOTES 5 111 bk Page 370 Monday July 10 2006 2 26 PM...
Страница 384: ...REPAIR INSTRUCTIONS PART 2 Page 371 REPAIR INSTRUCTIONS PART 2 5 111 bk Page 371 Monday July 10 2006 2 26 PM...
Страница 454: ...REPAIR INSTRUCTIONS PART 3 Page 441 REPAIR INSTRUCTIONS PART 3 5 111 bk Page 441 Monday July 10 2006 2 26 PM...
Страница 479: ...Page 466 NOTES 5 111 bk Page 466 Monday July 10 2006 2 26 PM...
Страница 480: ...SPECIFICATIONS Page 467 SPECIFICATIONS 5 111 bk Page 467 Monday July 10 2006 2 26 PM...
Страница 505: ...Page 492 NOTES 5 111 bk Page 492 Monday July 10 2006 2 26 PM...
Страница 506: ...SCHEMATIC ROUTING DIAGRAMS Page 493 SCHEMATIC ROUTING DIAGRAMS 5 111 bk Page 493 Monday July 10 2006 2 26 PM...
Страница 513: ...Page 500 NOTES 5 111 bk Page 500 Monday July 10 2006 2 26 PM...
Страница 514: ...SPECIAL TOOLS EQUIPMENT Page 501 SPECIAL TOOLS EQUIPMENT 5 111 bk Page 501 Monday July 10 2006 2 26 PM...
Страница 519: ...Page 506 NOTES 5 111 bk Page 506 Monday July 10 2006 2 26 PM...
Страница 520: ...APPENDIX Page 507 APPENDIX 5 111 bk Page 507 Monday July 10 2006 2 26 PM...
Страница 528: ...INDEX Page 515 INDEX Index fm Page 515 Monday July 10 2006 2 48 PM...
Страница 535: ...Page 522 NOTES Index fm Page 522 Monday July 10 2006 2 48 PM...