🔧 Product Description
Aftermarket Onan MDKD/MDKB Heat Exchanger - Replacement Part Number: MEC 130-7489-02CN
Complete heat exchanger for Cummins Onan MDKD and MDKB marine diesel generator sets.
⚙️ 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:
• 130-7489-02CN → Replaces 130-7489-02 and 130-7489-03
OEM / Related Numbers:
• 130-7489-02CN
• 130-7489-02
• 130-7489-03
• 130-5176 cap kit
Aftermarket / Verified Equivalents:
• Mr Cool: MRC130-7489-02CN
• Seakamp: 130-7489-02CN
• Lenco: LE-130-7489
Included Components:
• Heat exchanger - Part Number: 130-7489-02CN
• End cover - Part Number: 130-5169
• End-cover O-ring - Part Number: 509-0351
• End-cover gasket - Part Number: 130-5170
• End-cover bolt - Part Number: 800-0317
• Sacrificial zinc - Part Number: 130-4434 / 9-125
• Grounding stud - supplied with exchanger
🚤 Compatibility
Commonly used on:
• Marine-grade shell-and-tube heat exchanger systems
Typically suits:
• Engine models:
• Onan MDKDK/MDKDL/MDKDM/MDKDN
• MDKBK/MDKBL/MDKBM/MDKBR/MDKBS/MDKBT/MDKBU Spec D-G
• Bundle Diameter: approximately 2 in
• Bundle Length: approximately 10 in
• Construction: copper-nickel
🔌 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
