3910583 Aftermarket Cummins QSB 5.9L Heat Exchanger | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Engine Heat Exchanger - Replaces Part Number: 3910583

New copper-nickel heat exchanger replacing Cummins 3910583 for early 5.9L six-cylinder marine diesels. The approximately 4-inch × 25.7-inch assembly corresponds with the Sendure 9446-1-7 configuration.

⚙️ Key Features

• Direct replacement for Cummins 3910583

• Approximately 4-inch diameter × 25.7-inch shell

• Approximately 1.25-inch raw-water connection on the early configuration

• Copper-nickel tube bundle

• Designed for early 6BT/6BTA 5.9L marine engines

🧰 Kit / Assembly Contents

• 1 × Complete heat exchanger assembly - P/N 3910583

• 1 × integrated copper-nickel tube bundle

• End-cover seals, anode and mounting hardware are renewed separately unless included

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 3910583 ↔ Cross-references Sendure 9446-1-7

OEM / Related Numbers:

• 9446-1-7

• 3910583CN

Aftermarket / Verified Equivalents:

• Sendure: 9446-1-7

• Mr Cool: MRC3910583CN

• Lenco: LE3910583

🚤 Compatibility

Commonly used on:

• Cummins early 5.9L B-series marine diesel engines

Typically suits:

• Engine / Equipment models:

• 6BT 5.9 210HP applications

• 6BTA 5.9 250HP applications

• Early 6BT/6BTA CPLs whose parts catalogue specifies 3910583

• Output / Engine Rating: Approximately 210HP - 250HP on principal applications

• Engine / System Type: Inline six-cylinder turbocharged/aftercooled marine diesel engine

• Year Range: Early 6BT/6BTA 5.9 marine production

• Serial / Model Identification: Confirm engine CPL/serial because later 5.9L engines use 4020101.

🔌 Function

The heat exchanger transfers engine or generator coolant heat into the raw-water circuit while keeping the two fluids separated. This maintains the correct closed-circuit operating temperature and protects the engine from direct seawater circulation.

Common signs of failure:

• Engine or generator overheating under sustained load

• Coolant loss without an obvious external hose leak

• Saltwater and coolant cross-contamination

• Restricted raw-water discharge or uneven end-cap temperature

• Corrosion, green staining, cracked solder joints or pressure-test failure

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging