Cummins QSB 6.7 Engine 2007–2012 Service Repair Manual

🛠️ Cummins QSB 6.7 Engine 2007–2012 Service Repair Manual – PDF Download

🧰 This factory Cummins manual provides complete service and overhaul procedures for the QSB 6.7 diesel engine, including all Tier 3 / Stage IIIA compliant variants. Covering full teardown, ECM diagnostics, high-pressure fuel system repair, and wiring schematics, it's essential for technicians working on off-highway, agricultural, and industrial equipment.
📲 Instant PDF Download – Fully searchable and printable
🔧 Trusted by professionals worldwide for accuracy and detail

🔍 Model Background

The Cummins QSB 6.7 (2007–2012) is a Tier 3 / Stage IIIA compliant industrial diesel engine developed as a successor to the proven QSB 5.9. Designed to deliver higher performance, cleaner emissions, and greater electronic control, the QSB 6.7 became a top choice for heavy-duty applications including construction equipment, agricultural machinery, generators, and marine propulsion.

At the heart of the QSB 6.7 is a 6.7-liter inline 6-cylinder turbocharged engine equipped with a high-pressure common rail fuel system and Cummins’ advanced CM2150 electronic control module. Power ratings typically ranged from 155 to over 275 HP, with strong torque delivery and excellent fuel efficiency.

This engine was built to meet stringent emissions regulations without sacrificing reliability. It featured full-authority electronics, turbocharging with wastegate control, and integrated sensors for temperature, pressure, and fuel feedback. These features allowed precise engine management and diagnostics in real time.

Widely regarded for its durability, flexibility, and service-friendly design, the QSB 6.7 became a cornerstone in OEM equipment from brands like Case, Komatsu, John Deere, and more. Its legacy lives on in newer Tier 4 and Stage V variants still based on this proven architecture.

📘 Engine Model Covered:

• Cummins QSB 6.7 (6-cylinder, 6.7L turbo diesel)

📘 Manual Details:

• Engine Type: Inline 6-cylinder, 4-stroke, turbocharged diesel
• Displacement: 6.7 Liters
• Fuel System: High Pressure Common Rail (HPCR)
• Electronic Controls: ECM-managed with full diagnostics
• Cooling System: Water-cooled with thermostat regulation
• Applications: Industrial, off-highway, agricultural, marine
• Language: English
• Pages: 662

📚 Manual Sections Include:

• General Information
• Engine ID, safety precautions, torque specs
• Disassembly & Assembly
• Crankshaft, pistons, liners, camshaft, valve mechanism
• Fuel System
• HPCR components, injector setup, fuel pump service
• Lubrication System
• Oil pump, filters, diagnostics, pressure checks
• Cooling System
• Thermostat, water pump, cooling flow, radiator service
• Air & Exhaust
• Turbocharger inspection, air intake system, EGR if equipped
• Electronic Controls
• ECM fault codes, sensors, wiring checks, test procedures
• Troubleshooting
• Engine symptoms, performance issues, fault code charts
• Wiring Diagrams
• Complete electrical schematics for all sensors and ECM circuits

💾 Format & Compatibility:

• File Type: PDF (Digital Download)
• Searchable & Bookmarked: ✅ Yes
• Printable: ✅ Yes – Print individual sections or the entire manual
• Compatible With: Windows, Mac, iOS, Android, Linux

🔍 Keywords:

Cummins QSB 6.7 service manual PDF, QSB6.7 ECM diagnostics, HPCR fuel system repair, turbocharger service, engine rebuild instructions, wiring diagram, fault code troubleshooting

❓ Mini FAQ:

Q: Does this manual cover Tier 3 / Stage IIIA variants of the QSB 6.7?
A: Yes – it includes all Tier 3 compliant models across industrial and off-road equipment.

Q: Can I use this manual for diagnostics and wiring repairs?
A: Absolutely – the manual includes full ECM troubleshooting steps and complete schematics.

Q: Is this a full factory service manual?
A: Yes – this is the official Cummins repair manual used by certified diesel technicians.