Cummins B3.9 & B5.9 Series Troubleshooting and Repair Manual • Bulletin No. 3666087-01, October 1999
Cummins Models Covered & Key Technical Specifications
Models: B3.9, 4B3.9, 4BT3.9, 4BTA3.9, B5.9, 6B5.9, 6BT5.9, 6BTA5.9
Sub-models / Variants: Naturally Aspirated, Turbocharged, Aftercooled, Automotive, Nonautomotive
Model Years: 1999
Technical Data:
- Engine Displacement: 3.9 liters (B3.9 series), 5.9 liters (B5.9 series)
- Compression Ratio: 16.5:1 to 18.5:1 depending on model configuration
- Valve Clearance Intake: 0.25 mm [0.010 in]
- Valve Clearance Exhaust: 0.51 mm [0.020 in]
- Oil Pressure at Idle (min): 69 kPa [10 psi]
- Oil Pressure at Rated (min): 207 kPa [30 psi]
- Cooling System Capacity (B3.9 Automotive): 7 liters [7.4 qt]
- Cooling System Capacity (B5.9 Automotive): 10.5 liters [11.1 qt]
- Lubricating Oil Capacity (B5.9 Standard Pan): 14.2 liters [15 qt]
- Fuel Transfer Pump Minimum Pressure: 175 kPa [25 psi] at rated rpm
Cummins Manual Features & Content Preview
1999 Cummins B3.9 & B5.9 Troubleshooting and Repair Manual: Specs, Diagrams & Tables
Whether you are running diagnostics on a 4BT or tearing down a 6BTA, having the exact factory numbers is non-negotiable. This 928-page OEM reference cuts out the guesswork, delivering the precise troubleshooting logic and technical data needed for early automotive and industrial applications.
- Supported Engines: Covers 4-cylinder and 6-cylinder diesel configurations, including the 4BT, 4BTA, 6BT, and 6BTA.
- Official Data: Cummins publication bulletin No. 3666087-01 (printed October 1999).
- Workshop Ready: Features 12 detailed system diagrams and 27 specific symptom charts for fast, accurate diagnostics.
- Fully Searchable: The indexed PDF format lets you find critical torque and pressure data in seconds.
- Instant Access: Get your instant download directly upon checkout—no waiting for shipping.
Engine System Reference
Stop hunting through forums for unverified specs. This manual lays out the complete architecture for both the B3.9 and B5.9 platforms. You get direct access to comprehensive diagnostic logic trees that help identify root causes for air compressor lag, cooling system faults, and abnormal combustion characteristics.
The reference material maps out the entire assembly. It covers the cylinder block, cylinder head, rocker levers, fuel delivery systems, and turbocharger inspection criteria. It also defines the integration points for intake air management and electrical systems.
Critical Specifications & Capacities
Precision is everything in heavy-duty diesel work. This document provides the exact multi-stage cylinder head bolt torque sequences and clearance charts required for a proper rebuild. It outlines strict parameters for performance analysis, including minimum oil pressure limits (like the 207 kPa rated speed requirement for the B5.9) and fuel system pressure drop constraints for filtering components.
You will also find detailed fluid capacities ranging from 7 liters for the standard B3.9 up to 14.5 liters for the 6BTA5.9, alongside specific tolerances such as the 0.25 mm intake valve clearance.
Working on high-compression diesel systems involves inherent risks. Always ensure your workspace is secure and carefully cross-reference these factory specifications during any diagnostic or tear-down procedure to maintain safe operating standards.
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