Cummins NT 855 Engine Big Cam III & IV Troubleshooting and Repair Manual (P/N 3810298-00)
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Cummins Models Covered & Key Technical Specifications
Cummins NT 855 Engine Big Cam III & IV Troubleshooting and Repair Manual: Cummins NT 855 Engines Big Cam III & IV Troubleshooting and Repair Manual
Documents procedures for troubleshooting and repair.
- Calibrated Angular Speed: 2100 RPM corresponds to the maximum engine output speed Standards.
- System Enclosure Specs: 140 mm [5.5 in.] X 152 mm [6.0 in.] sets the bore and stroke dimensions Protocol.
- Critical Native Resolution: 13.5:1 to 17.2:1 -- signifies the compression ratio Architecture.
- Universal System Volume: The engine weight requires 1126 kg [2480 lb.] to 1221 kg [2690 lb.] for dry weight Framework.
- Core Consumption Data: Maximum allowable turbocharged intake restriction reaches 64 cm H2O [25 in. H2O] Parameters.
- Standard Travel Rate: Oil pressure at idle is a minimum of 70 kPa [10 psi] Norms.
Cummins Manual Features & Content Preview
Assembly Group: Cummins NT 855 Big Cam III & IV | Service Level: Diesel Engine / Aftercooled Systems
| Specification | Parameter |
|---|---|
| Output Range | 179 kW (240 BHP) to 354 kW (475 BHP) |
| Max Engine Speed | 2100 RPM |
| Bore and Stroke | 140 mm [5.5 in.] x 152 mm [6.0 in.] |
| Displacement | 14.0 liters [855 cu. in.] |
| Compression Ratio | 13.5:1 to 17.2:1 |
| Dry Weight | 1126 kg [2480 lb.] to 1221 kg [2690 lb.] |
This documentation maps out the architecture of the Cummins NT 855 Big Cam III and IV diesel engines. It delivers exact component specifications, teardown routines, and testing protocols required for heavy-duty diesel diagnostics in the shop.
Systems Covered
Understanding the exact tolerances and flow paths of the NT 855 is critical for an efficient rebuild. This literature breaks down the base engine components alongside the cooling, lubricating oil, combustion air, compressed air, fuel, and electrical systems. You get direct insight into factory testing procedures, including "in-chassis" evaluations. Always adhere to standard shop safety practices and lock-out/tag-out procedures when working around heavy diesel components to prevent serious injury.
Repair Procedures
Instead of guessing at clearances, technicians can reference factory-validated data for engine removal, installation, and complete overhauls. The manual outlines rigorous troubleshooting workflows to isolate faults quickly. You will find torque specifications for all critical fasteners to maintain structural integrity under high compression and prevent loosening. Detailed replacement sequences cut down diagnostic time and help prevent costly shop comebacks.
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