3934877 Water Inlet Connection for Cummins 1989 2002 6BT5.9 Diesel Engine

Product Overview

This water inlet connection is designed to supply coolant to the cylinder block in Cummins 6BT5.9 diesel engines. It ensures reliable flow between the radiator and engine block, making it an essential component for engine cooling systems. Ideal for repair or replacement on older Cummins 5.9L diesel engines.

Key Features & Performance

• Direct replacement for OEM part numbers 3934877 and 3903102
• Constructed from corrosion-resistant materials for long service life
• Engineered to maintain proper coolant flow and pressure
• Easy bolt‑on installation with no modification required
• Tested to meet or exceed factory specifications

Fitment & Compatibility

• Cummins 6BT5.9 diesel engines (1989-2002 model years)
• Compatible with Dodge Ram trucks, Ford E‑series vans, and other applications using this engine

Common Uses

• Replacement of corroded or leaking water inlet connections on Cummins 5.9L engines
• Engine overhaul and cooling system restoration projects
• Maintenance for Class A motorhomes, box trucks, and marine generator sets

Technical Specifications

• Part Number(s): 3934877, 3903102
• Material: Cast aluminum / steel
• Thread Size: 1-1/2" NPT (inlet)

Frequently Asked Questions

Q: Is this water inlet connection compatible with a 1998 Cummins 6BT5.9? A: Yes, this part fits 6BT5.9 engines from 1989 to 2002, including the 1998 model year.

Q: Does this come with gaskets or mounting hardware? A: This listing is for the water inlet connection only; gaskets and hardware may need to be purchased separately.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.