Complete workshop repair service manual with electrical wiring diagrams for Caterpillar 3408C, 3412C, 3412D Engines. It's the same service manual used by dealers that guaranteed to be fully functional and intact without any missing page.

This Caterpillar 3408C, 3412C, 3412D Engines service & repair manual (including maintenance, overhaul, disassembling & assembling, adjustment, tune-up, operation, inspecting, diagnostic & troubleshooting…) is divided into different sections. Each section covers a specific component or system with detailed illustrations. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. The printer-ready PDF documents work like a charm on all kinds of devices.

MANUAL LIST:
RENR1389 - Disassembly & Assembly (3412C Generator Set Engine)
SENR1095 - Disassembly & Assembly (3408C & 3412C Marine Engines)
SENR1147 - Specifications (3408C and 3412C Marine Engines)
SENR5516 - Specifications (3408C, 3412C & 3412D High Performance Marine Engines)
SENR5517 - Systems Operation (3408C, 3412C & 3412D High Performance Marine Engines)
SENR5517 - Testing & Adjusting (3408C, 3412C & 3412D High Performance Marine Engines)
SENR7380 - Specifications (3408B & 3408C Industrial & Marine Engines)
KENR8699 - Schematic (3412C Generator Set with EMCP 3 Electrical System).pdf
SEBU6497 - Maintenance Intervals (3408C, 3412, 3412C & 3412D High Performance Marine Engines).pdf
SEBU6497 - Operation & Maintenance Manual (3408C, 3412, 3412C & 3412D High Performance Marine Engines).pdf
SENR1133 - Disassembly & Assembly (3408C & 3412C Marine Engines).pdf
SENR1148 - Systems Operation (3408C & 3412C Marine Engines).pdf
SENR1148 - Testing & Adjusting (3408C & 3412C Marine Engines).pdf

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KENR8699 - Schematic (3412C Generator Set with EMCP 3 Electrical System)...1
RENR1389 - Disassembly & Assembly (3412C Generator Set Engine)...3
  Air Cleaner...5
  Alternator...7
  Automatic Timing Advance (Used With Twin Turbocharger Arrangement)...9
  Belts...14
  Bridge Dowels...16
  Camshaft Bearings...18
  Camshaft...22
  Connecting Rod Bearings...25
  Control Module...28
  Crankshaft Front Seal & Wear Sleeve...30
  Crankshaft Main Bearings...33
  Crankshaft Rear Seal & Wear Sleeve...37
  Crankshaft...41
  Cylinder Head...51
  Cylinder Liners...57
  Direct Injection Adapters...61
  Engine Front Support...64
  Exhaust Manifold...66
  Fan...69
  Fixed Timing Advance (Used with Series Turbocharger Arrangement)...71
  Flywheel Housing...74
  Flywheel...85
  Fuel Filter Base- Primary...88
  Fuel Filter Base-Secondary...90
  Fuel Injection Lines...93
  Fuel Injection Nozzles & Adapters...95
  Fuel Injection Pump Housing And Governor...98
  Fuel Injection Pump Housing...103
  Fuel Injection Pumps...121
  Fuel Injection Valves...127
  Fuel Shutoff Solenoid...130
  Fuel Transfer Pump 1...131
  Fuel Transfer Pump 2...136
  Governor & Fuel Injection Pump Housing...143
  Governor (Dashpot Governor)...168
  Oil Bypass Valve...173
  Oil Cooler...175
  Oil Filter Base...178
  Oil Pan...179
  Oil Pump...180
  Personality Ratings Module...186
  Piston Cooling Jets...187
  Pistons...189
  Radiator...196
  Rocker Shaft Assembly...198
  Spacer Plates...205
  Timing Gear Cover...207
  Timing Gears...210
  Turbocharger (Engines With One Turbocharger)...214
  Turbocharger (Engines With Two Turbochargers)...219
  Turbocharger (Left Side & Rear) STA...222
  Valve Covers...225
  Valve Guides...227
  Valve Lifters & Push Rods...229
  Valve Seat Inserts...233
  Valves...235
  Vibration Damper & Pulley...238
  Water Pump...241
  Water Temperature Regulator...248
SEBU6497 - Maintenance Intervals (3408C, 3412, 3412C & 3412D High Performance Marine Engines)...251
SEBU6497 - Operation & Maintenance Manual (3408C, 3412, 3412C & 3412D High Performance Marine Engines)...291
SENR1095 - Disassembly & Assembly (3408C & 3412C Marine Engines)...332
  Aftercooler Core ...335
  Air Filter ...338
  Bridge Dowels ...340
  Camshaft Bearings...342
  Camshaft...345
  Connecting Rod Bearings ...348
  Crankcase Breather...351
  Crankshaft ...353
  Crankshaft Front Seal & Wear Sleeve ...358
  Crankshaft Main Bearings...362
  Crankshaft Rear Seal & Wear Sleeve...367
  Crankshaft...369
  Cylinder Head Assemblies ...374
  Cylinder Liners ...381
  Direct Injection Adapters ...390
  Engine Lifting Brackets ...393
  Engine Oil Cooler...395
  Engine Support (Front)...400
  Exhaust Manifold (Water Cooled)...402
  Exhaust Manifold (rear) ...406
  Expansion Tank & Water Lines ...411
  Flywheel Housing ...413
  Flywheel...418
  Front Housing ...420
  Front Housing Cover ...423
  Fuel Filter & Fuel Filter Base ...432
  Fuel Injection Lines ...434
  Fuel Injection Nozzles & Adapters...438
  Fuel Injection Pump Housing & Governor ...441
  Fuel Injection Pumps...447
  Fuel Injection Valves (Direct Injection)...451
  Fuel Injection Valves (Precombustion Chamber)...454
  Fuel Priming Pump ...456
  Fuel Ratio Control...458
  Fuel Transfer Pump ...463
  Glow Plugs (Precombustion Chambers) ...472
  Governor & Fuel Pump Drive ...474
  Governor ...478
  Introduction...523
  Marine Gear Oil Cooler ...524
  Oil Filters & Oil Filter Base...528
  Oil Level Gauge...532
  Oil Pan ...533
  Oil Pump ...536
  Piston Cooling Tubes ...539
  Pistons ...542
  Precombustion Chambers ...551
  Raw Water Pump ...554
  Rocker Shaft Assembly ...561
  Service Meter ...564
  Spacer Plates ...565
  Tachometer ...567
  Tachometer Drive ...568
  Timing Gears...569
  Turbocharger...572
  Valve Covers...576
  Valve Guides ...580
  Valve Lifters & Push Rods ...582
  Valve Seat Inserts ...585
  Valves ...587
  Vibration Damper & Pulley  ...594
  Water Pump ...598
  Water Temperature Regulators ...605
SENR1133 - Disassembly & Assembly (3408C & 3412C Marine Engines) (low scan quality_reference only)...650
SENR1133 - Disassembly & Assembly (3408C & 3412C Marine Engines)...737
  Aftercooler...740
  Air Cleaner Assembly...743
  Air Filter...745
  Bridge Dowels...746
  Camshaft Bearings...748
  Camshaft...751
  Connecting Rod Bearings...755
  Crankcase Breather...758
  Crankshaft Front Seal & Wear Sleeve...759
  Crankshaft Main Bearings...763
  Crankshaft Pulley & Damper...767
  Crankshaft Rear Seal & Wear Sleeve...771
  Crankshaft...775
  Cylinder Head Assemblies...780
  Cylinder Liners...785
  Direct Injection Adapters...789
  Engine Lifting Brackets...792
  Engine Support...794
  Exhaust Manifold (Water Cooled)...796
  Exhaust Manifold (rear)...800
  Expansion Tank & Water Lines...803
  Fan Belts...806
  Fan Drive...808
  Fan Guard...814
  Fan...816
  Flywheel Housing...817
  Flywheel...822
  Front Housing Cover...824
  Front Housing...828
  Fuel Filter...830
  Fuel Injection Lines...832
  Fuel Injection Nozzles & Adapters (Later 7000 Series)...836
  Fuel Injection Nozzles...839
  Fuel Injection Pump Housing & Governor...845
  Fuel Injection Pumps...850
  Fuel Injection Valves (Direct Injection)...854
  Fuel Injection Valves (Precombustion Chamber)...857
  Fuel Priming Pump & Filter Base...860
  Fuel Ratio Control...861
  Fuel Transfer Pump...865
  Generator...874
  Glow Plugs (Precombustion Chambers)...881
  Governor & Fuel Pump Drive...883
  Governor...890
  Oil Bypass Valves...933
  Oil Cooler...935
  Oil Filter Base...937
  Oil Filters...940
  Oil Level Gauge...941
  Oil Pan...942
  Oil Pump...944
  Piston Cooling Tubes...950
  Pistons...952
  Precombustion Chambers...961
  Radiator...964
  Raw Water Pump...967
  Rocker Shaft Assembly...980
  Service Meter...985
  Spacer Plates...987
  Timing Gears...989
  Turbocharger...992
  Valve Covers...998
  Valve Lifters & Push Rods...1001
  Valve Seat Inserts...1004
  Valves...1007
  Vibration Damper & Pulley...1010
  Water Pump...1012
  Water Temperature Regulators...1021
SENR1147 - Specifications (3408C and 3412C Marine Engines)...1027
  Aftercooler...1029
  Air Starting Motor...1031
  Alternator and Regulator...1035
  Automatic Timing Advance Unit ...1049
  Auxiliary Drive Pulley...1051
  Auxiliary Water Pump...1057
  Belt Tension Chart...1061
  Camshaft ...1064
  Camshaft Bearings ...1068
  Camshaft...1070
  Connecting Rod and Main Bearing Journals...1072
  Connecting Rod...1074
  Coolant Conditioner Base...1077
  Crankcase Breather...1079
  Crankshaft...1080
  Cylinder Block...1084
  Cylinder Head ...1086
  Cylinder Head Valves ...1098
  Cylinder Liner Projection...1101
  Cylinder Liner...1102
  Electric Starting Motor...1104
  Engine Design...1108
  Engine Oil Filter Base...1114
  Engine Oil Lines ...1117
  Engine Oil Lines...1124
  Engine Oil Pan...1126
  Engine Oil Pump...1127
  Exhaust Manifold - Water Cooled...1130
  Exhaust Manifold ...1132
  Flywheel Housing...1136
  Flywheel...1141
  Fuel Filter (Primary) ...1147
  Fuel Filter Base ...1149
  Fuel Injection Lines ...1153
  Fuel Injection Lines...1159
  Fuel Injection Nozzles and Adapters ...1167
  Fuel Injection Pump ...1171
  Fuel Injection Pump Housing ...1181
  Fuel Ratio Control ...1188
  Fuel Transfer Pump ...1190
  Gear Group (Front)...1194
  Gear Group (Rear)...1198
  Housing (Front)...1199
  Magnetic Pickup...1202
  Piston and Rings ...1204
  Turbocharger ...1207
  Valve Mechanism Cover ...1209
  Valve Mechanism Cover...1212
  Valve Rocker Arms, Lifters, and Bridges ...1216
  Vibration Damper and Pulley...1220
  Water Pump...1222
  Water Temperature Regulator...1224
SENR1148 - Systems Operation (3408C & 3412C Marine Engines)...1226
SENR1148 - Testing & Adjusting (3408C & 3412C Marine Engines)...1264
SENR5516 - Specifications (3408C, 3412C & 3412D High Performance Marine Engines)...1372
  Aftercooler...1374
  Air Starting Motor...1376
  Alternator and Regulator...1378
  Automatic Timing Advance Unit...1386
  Auxiliary Drive Pulley...1391
  Auxiliary Water Pump...1393
  Belt Tension Chart...1396
  Camshaft Bearings...1398
  Camshaft...1401
  Connecting Rod and Main Bearing Journals...1404
  Connecting Rod...1406
  Coolant Conditioner Base...1414
  Crankcase Breather...1416
  Crankshaft...1418
  Cylinder Block...1420
  Cylinder Head Valves...1425
  Cylinder Head...1429
  Cylinder Liner Projection...1437
  Cylinder Liner...1438
  Electric Starting Motor...1440
  Engine Design...1450
  Engine Oil Filter Base...1454
  Engine Oil Lines...1457
  Engine Oil Pan...1459
  Engine Oil Pump...1462
  Exhaust Manifold...1466
  Flywheel Housing...1472
  Flywheel...1476
  Fuel Filter (Primary)...1479
  Fuel Filter Base...1481
  Fuel Injection Lines - Left Side of Engine 1...1483
  Fuel Injection Lines - Left Side of Engine 2...1486
  Fuel Injection Lines - Left Side of Engine...1490
  Fuel Injection Lines - Right Side of Engine 1...1493
  Fuel Injection Lines - Right Side of Engine 2...1497
  Fuel Injection Lines - Right Side of Engine...1500
  Fuel Injection Lines...1504
  Fuel Injection Nozzles and Adapters...1508
  Fuel Injection Pump Housing...1510
  Fuel Injection Pump...1517
  Fuel Ratio Control...1537
  Fuel Transfer Pump...1539
  Gear Group (Front)...1544
  Gear Group (Rear)...1550
  Housing (Front)...1551
  Magnetic Pickup...1554
  Piston and Rings...1556
  Turbocharger...1561
  Valve Mechanism Cover...1564
  Valve Rocker Arms, Lifters, and Bridges...1566
  Vibration Damper and Pulley...1571
  Water Pump...1575
  Water Temperature Regulator...1577
SENR5517 - Systems Operation (3408C, 3412C & 3412D High Performance Marine Engines)...1579
  Air Inlet and Exhaust System...1580
  Basic Engine...1589
  Cooling System...1592
  Electrical System...1597
  Electronic Control System Components...1609
  Engine Design...1623
  Fuel System...1627
  General Information...1648
  Glossary of Electronic Control Terms...1656
  Lubrication System...1661
SENR5517 - Testing & Adjusting (3408C, 3412C & 3412D High Performance Marine Engines)...1667
  Air Inlet and Exhaust System - Inspect...1669
  Automatic Timing Advance Unit - Test...1674
  Battery - Test...1681
  Belt Tension Chart...1683
  Charging System - Test...1686
  Compression - Test...1690
  Connecting Rod Bearings - Inspect...1691
  Cooling System - Inspect...1692
  Cooling System - Test...1694
  Cylinder Block - Inspect...1703
  Cylinder Head - Inspect...1705
  Cylinder Liner Projection - Inspect...1706
  Electric Starting System - Test...1712
  Engine Crankcase Pressure (Blowby) - Test...1713
  Engine Oil Pressure - Test...1715
  Engine Speed - Check...1723
  Engine Valve Lash - InspectAdjust...1725
  Excessive Bearing Wear - Inspect...1733
  Excessive Engine Oil Consumption - Inspect...1734
  Exhaust Temperature - Test...1736
  Finding Top Center Position for No. 1 Piston...1737
  Flywheel - Inspect...1741
  Flywheel Housing - Inspect...1744
  Fuel Injection Nozzle - Test...1749
  Fuel Ratio Control - Adjust...1750
  Fuel Setting - Adjust...1753
  Fuel System - Inspect...1770
  Fuel System Pressure - Test...1772
  Governor - Adjust...1774
  Increased Engine Oil Temperature - Inspect...1786
  Inlet Manifold Pressure - Test...1787
  Main Bearings - Inspect...1789
  Pinion Clearance - Adjust...1790
  Piston Ring Groove - Inspect...1792
  Troubleshooting...1794
  Turbocharger - Inspect...1816
SENR6475 - Specifications (3408C ENGINE FOR CATERPILLAR BUILT MACHINES)...1818
  Air Cleaner Group...1821
  Air Compressor Drive Group...1825
  Alternator And Regulator...1826
  Alternator Belt Tightener...1838
  Belt Tension Chart...1839
  Belt Tightener...1840
  Camshaft...1842
  Connecting Rod And Main Bearing Journals...1844
  Connecting Rod...1846
  Coolant Conditioner Base...1849
  Coolant Flow Switch...1850
  Crankshaft Rear Gear...1851
  Crankshaft Seals...1853
  Crankshaft...1854
  Cylinder Block...1856
  Cylinder Heads...1860
  Cylinder Liner Projection...1863
  Cylinder Liners...1866
  Dust Ejector Group...1868
  Engine Design...1869
  Engine Support Group...1871
  Ether Starting Aid...1874
  Exhaust Manifolds...1875
  Fan Drive...1877
  Fan Group...1879
  Flywheel Housing...1882
  Flywheel...1891
  Front Timing Gears...1900
  Fuel Injection Lines...1903
  Fuel Injection Nozzle And Adapter...1906
  Fuel Injection Pump Housing...1908
  Fuel Injection...1911
  Fuel Ratio Control...1914
  Fuel System Identification...1916
  Fuel Transfer Pump Drive...1918
  Fuel Transfer Pump...1919
  Governor And Fuel Pump Drive...1923
  Governor Drive And Oil Pump...1927
  Governor...1929
  Inlet Air And Exhaust Lines...1935
  Introduction...1941
  Magnetic Pickup...1942
  Muffler Group...1943
  Oil Breather Cap...1946
  Oil Bypass Valves...1947
  Oil Filters...1949
  Oil Pan...1950
  Oil Pump...1952
  Pistons And Rings...1959
  Primary Fuel Filter And Fuel Filter Base...1961
  Radiator...1964
  Rear Gear Group...1967
  Starting Motor Solenoids...1972
  Starting Motor...1974
  Tachometer Drive...1976
  Timing Gear Housing...1978
  Trunnion Group...1983
  Turbocharger...1985
  Valve Mechanism Covers...1991
  Valve Rocker Arms, Lifters And Bridges...1993
  Valves, Valve Springs And Valve Seat Inserts...1996
  Water Pump...2000
  Water Temperature Regulator...2002
SENR6476 - Systems Operation (3408C ENGINE FOR CATERPILLAR BUILT MACHINES)...2003
SENR6476 - Testing And Adjusting (3408C ENGINE FOR CATERPILLAR BUILT MACHINES)...2037
SENR7380 - Specifications (3408B & 3408C Industrial & Marine Engines)...2128
  Aftercooler...2130
  Air Starting Motor ...2132
  Alternator and Regulator ...2134
  Alternator and Regulator...2139
  Automatic Timing Advance Unit ...2148
  Automatic Timing Advance Unit...2154
  Auxiliary Drive Pulley ...2156
  Auxiliary Water Pump ...2162
  Belt Tension Chart ...2165
  Camshaft ...2170
  Camshaft Bearings...2173
  Connecting Rod and Main Bearing Journals...2176
  Connecting Rod...2178
  Coolant Conditioner Base ...2181
  Crankcase Breather...2183
  Crankshaft ...2185
  Cylinder Block...2187
  Cylinder Head ...2190
  Cylinder Head Valves ...2194
  Cylinder Liner Projection...2198
  Cylinder Liner...2200
  Electric Starting Motor ...2202
  Engine Design ...2208
  Engine Oil Filter Base ...2210
  Engine Oil Lines...2213
  Engine Oil Pan...2216
  Engine Oil Pump ...2219
  Engine Oil Pump...2222
  Exhaust Manifold - Water Cooled...2225
  Flywheel ...2228
  Flywheel Housing ...2231
  Flywheel Housing...2236
  Flywheel...2239
  Fuel Filter (Primary) ...2240
  Fuel Filter Base ...2242
  Fuel Injection Lines...2244
  Fuel Injection Nozzles and Adapters...2248
  Fuel Injection Pump ...2251
  Fuel Injection Pump Housing...2253
  Fuel Ratio Control ...2256
  Fuel Transfer Pump...2258
  Gear Group (Front)...2260
  Gear Group (Rear) ...2263
  Housing (Front)...2264
  Magnetic Pickup...2267
  Piston and Rings  ...2271
  Turbocharger...2274
  Valve Mechanism Cover ...2276
  Valve Rocker Arms, Lifters, and Bridges  ...2281
  Vibration Damper and Pulley ...2286
  Water Pump ...2294
  Water Temperature Regulator ...2296

EXCERPT:
Individual fuel injection lines carry fuel from the fuel injection pumps to each cylinder. One section of line connects between the fuel injection pump and an adapter on the valve cover base. Another section of line on the inside of the valve cover base connects between the adapter and the fuel injection nozzle (3).
The fuel filters and priming pump are located in a compartment at the front of the fuel tank. The fuel transfer pump is mounted on a drive adapter on the fuel injection pump housing, and is driven by a shaft connected to the fuel injection pump camshaft. Fuel transfer pump relief valve (14) is located in the cover of the pump.
Fuel priming pump (13) is used before the engine is started to put pressure in the fuel system and to vent air from the system. A check valve (9) located in the fuel transfer pump adapter housing will let fuel go around the fuel transfer pump when the priming pump is in use.
There is no bleed orifice or valve installed on the fuel injection pump housing to vent air from this part of the fuel system. Air trapped in the fuel injection lines can be vented by loosening all of the fuel injection line nuts where they connect to the adapters in the valve cover base. Move the governor lever to the low idle position. Crank the engine with the starting motor until fuel without air comes from the fuel line connections. Tighten the fuel line nuts. This procedure is necessary because the fuel priming pump will not give enough pressure to push fuel through the reverse flow check valves in the fuel injection pumps of a direct injection system.
An automatic timing advance unit is mounted on the front of the fuel injection pump camshaft. It is driven by the engine camshaft gear inside the front timing gear housing. The automatic timing advance unit gives easier starting and smooth low speed operation. It will also advance timing as engine speed increases to give correct engine operation efficiency.