130-6547-03CN Aftermarket Onan MDKAL/MDKAV/MDKAW/MDKAZ Heat Exchanger 130-4702, 130-4985, 130-6547-02, 130-6547-03 | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Generator Heat Exchanger - Replaces Part Number: 130-6547-03CN

New hard-coated copper-nickel replacement heat exchanger for the Onan MDKAA/AB and MDKAL-through-MDKBN generator family. It consolidates several earlier single-pass and later-service Onan numbers.

⚙️ Key Features

• Replaces multiple Onan 130-series exchanger numbers

• Copper-nickel seawater bundle

• Hard-coated OEM-style shell

• Two-inch end-cover service family

• Designed for the listed MDK generator models

🧰 Kit / Assembly Contents

• 1 × Complete heat exchanger assembly - P/N 130-6547-03CN

• 2 × End-cover/gasket positions - two-inch service family

• 1 × Sacrificial zinc - replacement family 9-125 where fitted

• Sensor-port plugs and installation hardware supplied according to manufacturer package

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 130-6547-03 → Supersedes 130-6547-02

• 130-6547-02 → Supersedes/cross-references 130-4985-01 and 130-4985-03

• 130-4985 series → Replaces earlier 130-4702 single-pass exchanger

OEM / Related Numbers:

• 130-4702

• 130-4985

• 130-4985-01

• 130-4985-03

• 130-6547-02

• 130-6547-03

• 9-125

Aftermarket / Verified Equivalents:

• Mr Cool: MRC130-6547-03CN

• Seakamp: 130-6547-03CN

• Lenco: LE130-6547-03

🚤 Compatibility

Commonly used on:

• Onan closed-cooled marine diesel generator sets

Typically suits:

• Engine / Equipment models:

• MDKAA and MDKAB

• MDKAL, MDKAV, MDKAW and MDKAZ

• MDKBL, MDKBM and MDKBN

• Output / Engine Rating: Generator rating is model/specification-dependent

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

• Year Range: MDKAA through MDKBN production; specification-dependent

• Serial / Model Identification: Confirm the water-pressure/sensor port configuration and the superseded OEM number.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