4019958CN Aftermarket Cummins 6BT/6BTA Heat Exchanger 4 x 25 in 3914642 | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket Cummins 6BT/6BTA Heat Exchanger 4 x 25 in 3914642 - Replacement Part Number: 4019958CN

Copper-nickel heat exchanger for later Cummins 6BT and 6BTA marine engines.

⚙️ Key Features

• Marine-grade shell-and-tube heat exchanger

• Designed as a direct replacement for the listed reference numbers

• Helps maintain stable operating temperature under sustained marine load

• Marine connection sizes and mounting points must match the original assembly

• Suitable for professional marine cooling-system service and replacement

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 4019958 → Supersedes 3866719 and 3914642

OEM / Related Numbers:

• 4019958

• 3866719

• 3914642

• 4019958CN

Aftermarket / Verified Equivalents:

• Mr Cool: MRC4019958CN

• Seakamp: 4019958 copper-nickel replacement

🚤 Compatibility

Commonly used on:

• Marine-grade shell-and-tube heat exchanger systems

Typically suits:

• Engine models:

• Cummins 6BT later 250HP applications

• Cummins 6BTA 300HP applications

• Engine Displacement: 5.9L

• Body Diameter: 4 in

• Overall Length: approximately 25-3/4 in

• Sacrificial Anode: CDZ9-036

• End-Cover Kit: MRC4884-1A

🔌 Function

The heat exchanger keeps closed-loop coolant separate from seawater while transferring heat through the tube stack.

Common signs of failure:

• Engine or generator temperature rises above normal under load

• Coolant loss or seawater leakage around the exchanger

• Restricted seawater flow from scale, debris or damaged tubes

• Coolant contamination caused by an internal tube failure

• Corroded end covers, tube stack or sacrificial anode

📦 Condition

• Brand new aftermarket replacement part

• New and unused

• Supplied in manufacturer or equivalent protective packaging