130-6733CN Aftermarket Onan 27 MDKBT/MDKBU Heat Exchanger 130-6733-02 | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Generator Heat Exchanger - Replaces Part Number: 130-6733CN

New copper-nickel replacement heat exchanger for higher-output Onan MDKBT, MDKBU, MDKDS, MDKDT and MDKDU marine generator sets. It replaces the 130-6733 service family and measures approximately 3 inches × 14 inches.

⚙️ Key Features

• Replaces Onan 130-6733, 130-6733-01 and 130-6733-02

• Approximately 3-inch diameter × 14-inch length

• Copper-nickel seawater bundle

• Supports water-pressure sensor installation at the one-inch outlet where required

• Designed for 22.5kW and 27kW MDK generator families

🧰 Kit / Assembly Contents

• 1 × Complete heat exchanger - P/N 130-6733CN

• 1 × Water-pressure sensor port at the specified outlet

• End-cover seals, zincs, plugs and mounting hardware supplied or ordered according to installation

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 130-6733-02 → Supersedes 130-6733-01

• 130-6733-01 → Supersedes 130-6733

OEM / Related Numbers:

• 130-6733

• 130-6733-01

• 130-6733-02

Aftermarket / Verified Equivalents:

• Mr Cool: MRC130-6733CN

• Seakamp: 130-6733CN

• Lenco: LE130-6733

🚤 Compatibility

Commonly used on:

• Onan high-output closed-cooled marine generator sets

Typically suits:

• Engine / Equipment models:

• MDKBT

• MDKBU

• MDKDS

• MDKDT

• MDKDU

• Output / Engine Rating: Approximately 22.5kW - 27kW generator output

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

• Year Range: Model/specification-dependent MDK production

• Serial / Model Identification: Confirm generator model, specification letter and water-pressure sensor arrangement.

🔌 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