200 TROUBLESHOOTING
Page 9-5
ENGINE WILL NOT ACHIEVE NO-LOAD GOVERNED RPM
200773a
EXCESSIVE ENGINE VIBRATION
200774a
EXCESSIVE BLACK OR GRAY SMOKE
200775a
Possible Cause
Correction
1. Air in fuel system.
1. Check system for air leaks and correct as required. Air will
generally enter the fuel system on the suction side of the fuel
transfer pump.
2. Accelerator linkage loose or out of adjustment.
2. Check linkage. Make necessary adjustments.
3. Restricted fuel lines or stuck overflow valve.
3. Check flow in fuel lines. Check overflow valve for defects, improper
setting, sticking, or defective spring.
4. High idle adjustment set too high.
4. Check high idle adjustments. Adjust as required.
5. Chassis equipped with MACK Maxi-Miser: Air
leaks in the air supply line or defective control
valve.
5. Leaks in the air supply line to the transmission, or from the
transmission to the fuel injection pump governor, will restrict
maximum engine rpm in all gears. Check all lines and connections
for leaks and repair as required. Replace control valve if
necessary.
6. Fuel injection pump calibration incorrect.
6. Remove injection pump and nozzle assemblies from the engine.
Send the pump to an authorized MACK Fuel Injection System
Repair facility for repair and recalibration. Then reinstall the pump.
7. Internal fuel pump governor wear.
7. Remove the injection pump. Send the pump to an authorized MACK
Fuel Injection System Repair facility for repair and recalibration.
Then reinstall the pump.
Possible Cause
Correction
1. Loose vibration damper hub nut bolt.
1. Check condition of mounting. Make necessary repairs and
retorque.
2. Defective or damaged vibration damper.
2. Replace damper if it is verified as damaged or defective.
3. Fan blade not balanced.
3. Loosen or remove fan belts. Run the engine for a short period of
time at the rpm where the vibration was most noticeable. If the
vibration disappears, replace the fan assembly.
4. Engine supports loose, worn or defective.
4. Tighten all mounting bolts, or replace components as required.
5. Engine misfiring or running rough.
5. Check items listed in ENGINE MISFIRES in this section.
Possible Cause
Correction
1. Insufficient air for combustion.
1. Check air cleaner for restrictions. Check inlet manifold pressure,
and inspect the turbocharger for proper operation. Repair
or replace as required.
2. Excessive exhaust back pressure.
2. Check for faulty exhaust piping or restrictions in the muffler. Repair
or replace as required.
3. Improper grade of fuel.
3. Drain fuel from tank(s). Replace fuel filters and fill tank(s) with
MACK-specified diesel fuel.
4. Faulty fuel injection nozzle.
4. Isolate faulty nozzle and replace. Refer to item 7 in ENGINE
MISFIRES in this section.
5. Improper injection pump-to-engine timing.
5. Check timing and adjust as required.
5-101.bk Page 5 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...