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200 TROUBLESHOOTING
HIGH EXHAUST TEMPERATURE
200780a
Possible Cause
Correction
1. Operating chassis in wrong gear ratio for load,
grade and/or altitude.
1. Instruct operator on correct gear selection for load and grade
conditions.
2. Restrictions in the air induction system.
2. Inspect air induction system. Remove restrictions and/or replace
defective parts.
3. Air leaks in the air induction system.
3. Check pressure in the air intake manifold. Look for leaking piping,
and/or loose clamps. Make necessary repairs.
4. Leaks in the exhaust system (before the
turbocharger).
4. Check exhaust system for leaks. Make necessary repairs.
5. Incorrect fuel injection pump-to-engine timing.
5. Check fuel injection pump-to-engine timing. Adjust as required.
6. Restrictions in the exhaust system.
6. Inspect system. Make necessary repairs.
7. Improper valve lash adjustment.
7. Adjust valve lash setting to specified clearance.
8. Defective fuel injection nozzle assembly.
8. Isolate defective nozzle assembly. Remove, repair and/or replace
and reinstall.
9. Incorrect fuel injection pump calibration.
9. Remove injection pump and nozzle assemblies. Send fuel
injection pump to an authorized MACK Fuel Injection System
Repair facility for recalibration. Then reinstall the pump and nozzle
assemblies.
High Pyrometer — Normal Boost
10. Loose ducting.
10. Repair loose connections.
11. Core fin obstructions.
11. Clean core fins.
High Pyrometer — Low Boost
12. Blockage in ducting between the air cleaner
and the turbocharger.
12. Check for blockage and repair.
13. Dirty turbocharger.
13. Remove turbocharger and clean.
14. Leaks in the pressurized side of the air
induction system.
14. Check for leaks. Repair as required.
15. Core leak or inlet manifold leak.
15. Check for damaged core gaskets.
16. Open petcock.
16. Close petcock.
17. Core leakage.
17. Pressure test core. Remove, repair or replace core if test results
are unsatisfactory.
5-101.bk Page 8 Friday, March 17, 2006 11:05 AM
Summary of Contents for E7
Page 1: ...E7 ENGINE OVERHAUL AUGUST 1997 ENGINE 5 101...
Page 2: ...Page 0 front fr5 Page 0 Friday March 17 2006 11 04 AM...
Page 5: ...E7ENGINE OVERHAUL MARCH 2006 2 5M REP AUGUST 1997 10M MACK TRUCKS INC 1997 ENGINE 5 101...
Page 13: ...ABOUT THIS MANUAL Page ix ABOUT THIS MANUAL front fr5 Page ix Friday March 17 2006 11 04 AM...
Page 15: ...TABLE OF CONTENTS Page xi TABLE OF CONTENTS front fr5 Page xi Friday March 17 2006 11 04 AM...
Page 24: ...Page xx NOTES front fr5 Page xx Friday March 17 2006 11 04 AM...
Page 31: ...200 SPECIFICATIONS Page 2 1 SPECIFICATIONS 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 55: ...200 ENGINE REMOVAL Page 3 1 ENGINE REMOVAL 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 58: ...Page 3 4 NOTES 5 101 bk Page 4 Friday March 17 2006 11 05 AM...
Page 90: ...Page 4 32 NOTES 5 101 bk Page 32 Friday March 17 2006 11 05 AM...
Page 91: ...200 BENCH PROCEDURES Page 5 1 BENCH PROCEDURES 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 158: ...Page 5 68 NOTES 5 101 bk Page 68 Friday March 17 2006 11 05 AM...
Page 159: ...200 ENGINE ASSEMBLY Page 6 1 ENGINE ASSEMBLY 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 240: ...Page 6 82 NOTES 5 101 bk Page 82 Friday March 17 2006 11 05 AM...
Page 272: ...Page 8 10 NOTES 5 101 bk Page 10 Friday March 17 2006 11 05 AM...
Page 273: ...200 TROUBLESHOOTING Page 9 1 TROUBLESHOOTING 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 292: ...Page 9 20 NOTES 5 101 bk Page 20 Friday March 17 2006 11 05 AM...
Page 293: ...200 APPENDIX Page 10 1 APPENDIX 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 295: ...200 APPENDIX Page 10 3 E7 LUBRICATION SYSTEM 5 101 bk Page 3 Friday March 17 2006 11 05 AM...
Page 296: ...Page 10 4 200 APPENDIX E7 COOLING SYSTEM 5 101 bk Page 4 Friday March 17 2006 11 05 AM...
Page 297: ...INDEX Page 11 1 INDEX INDEX FR5 Page 1 Friday March 17 2006 11 04 AM...
Page 302: ...Page 11 6 NOTES INDEX FR5 Page 6 Friday March 17 2006 11 04 AM...
Page 303: ...E7 ENGINE OVERHAUL PRINTED IN U S A ENGINE 5 101 MACK TRUCKS INC 1997...