This 104-page CAT 3126 disassembly assembly manual (publication RENR1369-15, December 2005) provides complete step-by-step removal, installation, and rebuild procedures for Caterpillar 3126B and 3126E on-highway diesel engines. It covers fuel system components, turbocharger, valvetrain, oil system, cooling system, pistons, crankshaft, and rear power take-off with required tooling tables and torque specifications.
Official CAT 3126 disassembly assembly document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3126B and 3126E On-highway Engines |
| System/Group | Disassembly and Assembly |
| Publication no. | RENR1369-15 |
| Year/Revision | December 2005 |
| Pages | 104 |
| File size | 24.1 MB |
| Format | |
| Language | English |
Document table of contents
- Fuel Filter Base – Remove and Install
- Fuel Transfer Pump – Remove and Install
- Fuel Pressure Regulator – Remove and Install
- Unit Injector – Remove and Install
- Unit Injector Sleeve – Remove and Install
- Injection Actuation Pressure Control Valve – Remove, Disassemble, Assemble, Install
- Unit Injector Hydraulic Pump – Remove and Install
- Turbocharger – Remove and Install
- Exhaust Manifold – Remove and Install
- Exhaust Particulate Filter – Disassemble and Assemble
- Air Inlet Heater Solenoid – Remove and Install
- Air Inlet Cover – Remove and Install
- Inlet and Exhaust Valves – Remove and Install
- Inlet and Exhaust Valve Guides – Remove and Install
- Inlet and Exhaust Valve Seat Inserts – Remove and Install
- Engine Oil Filter Base – Remove, Disassemble, Assemble, Install
- Engine Oil Pump – Remove, Disassemble, Assemble, Install
- Water Pump – Remove, Disassemble, Assemble, Install
- Water Temperature Regulator – Remove and Install
- Engine Oil Pan – Remove and Install
- Piston Cooling Jets – Remove and Install
- Flywheel and Flywheel Housing – Remove and Install
- Rear Power Take-Off (RPTO) – Remove
- Idler Pulley – Remove, Disassemble, Assemble, Install
- Inlet Air Temperature Sensor – Install
Applicable truck models
This manual applies to Caterpillar 3126B and 3126E on-highway engines across multiple serial number prefixes: BKD1-Up, G3E1-Up, DPF1-Up, 1AJ1-Up, 8YL1-Up, CKM1-Up, CRP1-Up, 7AS1-Up, 8SZ1-Up, and 9SZ1-Up. These engines were widely used in medium-duty trucks such as the International 4300, Freightliner FL-Series, and other Class 6–8 vocational and highway vehicles. For OEM parts lookup and additional technical resources, visit Caterpillar’s official website.
Who needs this CAT 3126 disassembly assembly manual
Fleet mechanics, independent diesel technicians, and workshop owners performing in-frame overhauls or component-level repairs on 3126B/3126E engines will find this manual essential. It includes required tooling part numbers, torque values (such as oil pan bolts at 31 ± 3 N·m), cleanliness notices, and safety warnings critical for correct reassembly.
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