Cummins B3.9 & B5.9 Series Troubleshooting and Repair Manual
This manual provides instructions for troubleshooting and repairing the Cummins B3.9 and B5.9 Series Engines, covering engine identification, systems, and procedures. Bulletin No. 3666087-01.
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Models Covered & Key Technical Specifications
Advanced Factory Wiring Manual: Cummins B3.9 & B5.9 Engines Troubleshooting & Repair Manual - Comprehensive Diagnostics and Maintenance Library-Master
Cummins B3.9 & B5.9 Engines (3666087-01) -- 1999
Official Troubleshooting and Repair Manual | Edition.
- Prescribed Operating Temps: 104°C [220°F] Systems defines the operating range for coolant temperature Monitoring.
- Documented Burn-in Temperature: For optimal operation, 50°C [122°F] dictates the maximum acceptable component temperature during initial startup.
- Core Rated Data: 7 liters -- signifies the standard coolant capacity for the B3.9 engine in automotive applications.
- Rated System Volume: The cooling system requires 10.5 liters for the B5.9 automotive application.
- Technical Climate Specs: 35 kPa [5 psi] establishes the maximum allowable pressure drop across the fuel filter.
- Advanced Climate Specs: 69 kPa [10 psi] is the minimum allowable lubricating oil pressure at idle.
Professional Workshop Service Manual & Technical Specifications
Advanced Factory Wiring Manual: Cummins B3.9 & B5.9 Engines Troubleshooting & Repair Manual - Comprehensive Diagnostics and Maintenance Library-Master
System-Coverage: Cummins B3.9 & B5.9 Engines (3666087-01) // Coverage-Scope: Diesel Engine / Engine Logic // System-Coverage: Comprehensive Diagnostics and Maintenance
Specifications
| Specification | Parameters | Validation-Data |
|---|---|---|
| Engine Bore | B3.9: 102 mm [4.02 in], B5.9: 102 mm [4.02 in] | Specifications |
| Engine Stroke | B3.9: 120 mm [4.72 in], B5.9: 120 mm [4.72 in] | Specifications |
| Displacement | B3.9: 3.9 liters [238 in³], B5.9: 5.9 liters [360 in³] | Specifications |
Table of Contents Summary
Service sections detail: Engine Identification, Fuel Systems, Lubricating System, Cooling System, and Troubleshooting Symptoms.
Properly requiring the correct parts and procedures is essential for engine longevity. This manual provides comprehensive system overviews, including diagnostic protocols. Several troubleshooting symptom trees are included to aid in identifying and correcting common engine issues. Refer to Section V for specifications recommended by Cummins Engine Company, Inc.
HVAC system procedures are included for the complete engine system diagnostics.
Torque specifications are documented for critical engine components, such as main bearings and connecting rods, to ensure proper assembly and function.
Parts identification is covered for all major engine sub-assemblies, aiding in accurate part ordering and replacement.
Removal procedures are documented for key components, enabling systematic disassembly for repair or inspection.
Technical specifications are provided for various engine systems, including fuel, lubrication, and cooling, to guide maintenance and repair tasks.
This manual documents torque specifications for main bearings to ensure proper cyclic stress resistance.
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