This document is a CAT 3126 engine specifications manual providing factory torque values, dimensional tolerances, and step-by-step assembly procedures for Caterpillar 3126B and 3126E truck engines. Published as RENR1270-14 (March 2006), it spans 76 pages covering every major engine system from fuel injection to the electric starting motor. It is an essential reference for technicians performing overhaul or component replacement work.
Official CAT 3126 engine specifications document details
| Brand | Caterpillar (CAT) |
| Model coverage | 3126B and 3126E Truck Engines |
| System / Group | Engine Specifications — all major systems |
| Publication no. | RENR1270-14 |
| Year / Revision | March 2006 |
| Pages | 76 |
| File size | 0.9 MB |
| Format | |
| Language | English |
Document table of contents
- Engine Design
- Fuel Transfer Pump (Fuel Transfer Pump and High Pressure Oil Pump)
- Fuel Filter Base
- Injection Actuation Pressure Control Valve
- Unit Injector
- Valve Rocker Arms, Lifters, and Bridges
- Valve Mechanism Cover
- Cylinder Head Valves
- Cylinder Head
- Turbocharger
- Air Inlet Elbow
- Exhaust Manifold and Exhaust Elbow
- Camshaft
- Engine Oil Filter Base, Engine Oil Pump, and Engine Oil Pan
- Crankcase Breather
- Water Temperature Regulator
- Water Pump
- Cylinder Block and Cylinder Block Cover Group
- Crankshaft and Crankshaft Seals
- Rear Seal Carrier
- Vibration Damper
- Connecting Rod Bearing Journal and Main Bearing Journal
- Connecting Rod
- Piston and Rings (One-Piece Aluminum and Two-Piece Articulated)
- Flywheel and Ring Gear
- Electric Starting Motor and Solenoid
- Speed/Timing Sensor
Applicable truck models
This manual applies to Caterpillar 3126B and 3126E 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 installed in medium-duty trucks and buses. Key torque data in the document includes flywheel bolts at 120 ± 20 N·m (90 ± 15 lb ft), exhaust manifold bolts at 4 ± 1 N·m (35 ± 9 lb in) initial tightening, and starter solenoid terminal nuts at 8 ± 3 N·m (71 ± 27 lb in). Assembly notes specify sealant usage (2P-2333 High Temperature Sealer, 5P-3931 Anti-Seize Compound) and rear crankshaft seal depth of 16.0 ± 0.5 mm from the rear face of the block. For general product information visit Caterpillar’s official website.
Who needs this CAT 3126 engine specifications manual
Diesel mechanics, fleet maintenance technicians, and workshop owners servicing Caterpillar 3126B or 3126E truck engines need this document. It delivers the exact bolt torques, clearances, and part numbers required for correct reassembly during overhaul or component replacement.
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