This document is a maintenance manual for the NTC-400 BIG CAM I and BIG CAM III engines. It describes the maintenance methods and precautions for these two engines.
This manual provides detailed maintenance and repair instructions for Cummins NTC-400 diesel engines, specifically the Big Cam I and Big Cam III variants. It includes procedures for engine removal, component inspection, troubleshooting, and reassembly. Safety warnings are emphasized throughout, covering hazards like heavy components, compressed air use, and fuel system operations. The document is structured into four main chapters: general information, troubleshooting, maintenance instructions, and supporting information including parts lists and tools.
The manual is intended for military maintenance personnel servicing trucks M915-M920 and M915A4 equipped with these engines. It includes torque limits, wear limits, and detailed work packages for each maintenance task, with a focus on safety and precision during disassembly and reassembly.
This manual covers the 6 cylinder in-line turbocharged Cummins NTC-400 Big Cam I and Big Cam III diesel engines.
All trucks M915-M920 and M915A4 can be equipped with either Big Cam I or Big Cam III engines.
Compressed air used for cleaning purposes must not exceed 30 psi.