246491 Aftermarket Kohler Heat Exchanger 4EFZ, 4ESZ, 5EFZ, 6.5ESZ | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Generator Heat Exchanger - Replaces Part Number: 246491

New copper-nickel replacement heat exchanger for Kohler 246491. It is used on compact 4EFZ, 4ESZ, 5EFZ and 6.5ESZ marine generator sets.

⚙️ Key Features

• Direct replacement for Kohler 246491

• Copper-nickel seawater bundle

• Compact Kohler generator-set configuration

• Original-style hose and mounting layout

• Serviceable end-cap and zinc protection

🧰 Kit / Assembly Contents

• 1 × Complete heat exchanger assembly - P/N 246491

• 1 × Integrated copper-nickel tube bundle

• End-cap seals, zinc and mounting hardware are renewed separately unless included

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 246491 (Kohler OEM heat-exchanger reference)

OEM / Related Numbers:

• 246491-S

• 246491CN

Aftermarket / Verified Equivalents:

• Seakamp: 246491CN

• Mr Cool: MRC246491CN

• Lenco: LE246491

🚤 Compatibility

Commonly used on:

• Kohler compact closed-cooled marine generator sets

Typically suits:

• Engine / Equipment models:

• 4EFZ

• 4ESZ

• 5EFZ

• 6.5ESZ

• Output / Engine Rating: Approximately 4kW - 6.5kW generator output

• Engine / System Type: Closed-cooled marine diesel generator engine

• Year Range: Model/specification-dependent

• Serial / Model Identification: Confirm generator model and specification number.

🔌 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