130-6548CN Aftermarket Onan MDKA/MDKB/MDKDR 17.5kW Heat Exchanger | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Generator Heat Exchanger - Replaces Part Number: 130-6548CN

New hard-coated copper-nickel replacement for Onan 130-6548 and related exchanger numbers. The approximately 2.5-inch × 15-inch assembly is used across several MDK generator families, including the 17.5kW MDKDR.

⚙️ Key Features

• Replaces Onan 130-6548 and listed superseded numbers

• Approximately 2.5-inch diameter × 15-inch length

• Copper-nickel tube bundle

• Hard-coated shell with grounding provision

• Includes drain and sacrificial-zinc locations

🧰 Kit / Assembly Contents

• 1 × Complete heat exchanger assembly - P/N 130-6548CN

• 1 × Grounding stud - integrated where specified

• 1 × Sacrificial zinc position - zinc ordered separately unless supplied

• Drain plugs and end-cover seals supplied according to manufacturer package

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 130-6548-02 → Supersedes 130-6548

• 130-7986-02 → Related later service reference to 130-7986

• 130-7490-02CN → Related replacement configuration

• 130-6548 family → Cross-references 130-4433-01 and 130-5006

OEM / Related Numbers:

• 130-4433-01

• 130-5006

• 130-6548

• 130-6548-02

• 130-7986

• 130-7986-02

• 130-7490-02CN

Aftermarket / Verified Equivalents:

• Mr Cool: MRC130-6548CN

• Seakamp: 130-6548CN

• Lenco: LE130-6548

🚤 Compatibility

Commonly used on:

• Onan closed-cooled marine diesel generator sets

Typically suits:

• Engine / Equipment models:

• MDKAD and MDKAE

• MDKBD and MDKBE

• MDKBP and MDKBR specification A-C

• MDKBV and MDKBU

• MDKDR 17.5kW, including MDKDR-8202A

• 27MDKBU-6404B where the listed exchanger family is specified

• Output / Engine Rating: Approximately 17.5kW - 27kW on documented applications

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

• Year Range: Model- and specification-dependent MDK production

• Serial / Model Identification: Confirm generator specification, end-cover arrangement and sensor-port requirement.

🔌 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