This Cummins ISX CM870 manual is Volume 1 of the Signature, ISX and QSX15 service manual, Bulletin 3666239, covering in-chassis troubleshooting, repair and complete rebuild of the ISX engine with CM870 controls. It includes disassembly, cleaning, inspection and assembly instructions with specifications.
Official document details
| Brand | Cummins |
|---|---|
| Engine family | Signature, ISX, QSX15 (CM870 control) |
| System / Group | Service manual — Volume 1 |
| Bulletin | 3666239 |
| Printed | 02-MAY-2011 |
| Pages | 986 |
| File size | 53.6 MB |
| Format | |
| Language | English |
Cummins ISX CM870 manual table of contents
- Introduction and general safety instructions
- Engine and system identification
- Familiarization
- Troubleshooting symptoms
- Complete engine — Group 00
- Engine disassembly — Group 00
- Engine assembly — Group 00
- Cylinder block — Group 01
- Cylinder head — Group 02
- Rocker levers — Group 03
- Component manufacturers listing
Applicable truck models covered
Volume 1 addresses the Cummins ISX engine with the CM870 electronic control module used from the 2003-2006 era, alongside the Signature and QSX15 platform. Cummins recommends genuine Cummins or ReCon exchange parts and lists 1-800-DIESELS for authorized repair support. See the manufacturer at Cummins Inc..
Who needs the Cummins ISX CM870 manual
Fleet rebuild shops use this ISX CM870 manual because Volume 1 documents the engine identification, troubleshooting symptoms and complete disassembly and assembly specifications required to overhaul the CM870-controlled ISX.
The CM870 control module introduced revised electronics for the mid-2000s ISX, yet the mechanical repair sequence in this volume still follows the familiar component-group layout, from the complete engine through the cylinder block, cylinder head and rocker levers. The manual sets out the general safety instructions, the definition of a clean assembly area and the gasket surface preparation required before parts are refitted. Volume 1 handles engine and system identification, troubleshooting symptoms and the upper engine groups, while the companion Volume 2 continues the rest; Cummins recommends genuine Cummins or ReCon exchange parts throughout and lists the 1-800-DIESELS line for authorized repair locations. The specifications reflect the information in effect at the time of printing.
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