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200 TROUBLESHOOTING
Page 9-9
LOW ENGINE OIL PRESSURE
200781a
OIL IN THE COOLING SYSTEM
200782a
Possible Cause
Correction
1. Oil level insufficient. Oil leaking from oil line,
gasket, etc.
1. Check engine oil level. Add oil if necessary. Check for oil leaks.
Repair as required.
2. Incorrect oil viscosity.
2. Drain oil, change oil filters, and fill with the proper grade oil
meeting MACK specifications.
3. Defective oil pressure gauge.
3. Check the operation of the oil pressure gauge. If defective, replace.
4. Clogged oil filter(s).
4. Replace oil filters. Clean or replace oil cooler. Drain oil and refill
with oil meeting MACK specifications.
5. Engine oil diluted with diesel fuel.
5. Check fuel system for leaks. Make necessary repairs. Drain diluted
oil, change oil filters, and refill with oil meeting MACK specifications.
6. Defective oil pump relief valve.
6. Remove oil pressure relief valve and check condition of seat.
Check that relief valve spring is not sticking, and check for proper
spring tension. Check cap. Check assembly parts. Using the
incorrect parts will result in incorrect oil pressure. Make any
necessary repairs or install a new relief valve.
7. Oil pump gears not meshing properly.
7. Check mounting arrangement. If the engine has been rebuilt,
check that the gear ratio of the oil pump drive and driven gears are
correct. Incorrect gear combinations will result in immediate gear
failure and possible engine damage. Check for correct oil pad
gasket.
8. Excessive clearance between crankshaft and
bearings.
8. Overhaul the engine. Replace any worn/defective parts.
Possible Cause
Correction
1. Defective oil cooler core.
1. Disassemble and repair or replace oil cooler core.
2. Blown head gasket.
2. Replace head gasket.
COOLANT IN ENGINE OIL
Possible Cause
Correction
Cylinder sleeve seat seal failure.
Repair cylinder sleeve seat seals.
LOW COMPRESSION
Possible Cause
Correction
1. Improper valve lash adjustment.
1. Adjust valve lash to specified clearance.
2. Blown head gasket.
2. Replace head gasket.
3. Broken or weak valve springs.
3. Check and replace defective parts.
4. Burned valves, seats or parts.
4. Remove, recondition, and reinstall heads.
5. Piston rings stuck, worn, broken or improperly seated.
5. Overhaul engine.
6. Camshaft or valve lifters worn.
6. Replace camshaft and/or valve lifters. Overhaul engine if
required.
5-101.bk Page 9 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...