23502664 Aftermarket MTU Detroit Diesel Cooler | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Tandem Fuel and Gear-Oil Cooler - Replaces Part Number: 23502664

New copper-nickel tandem cooler replacing Detroit Diesel 23502664. The approximately 3-inch assembly is used on selected 6-53T marine installations and contains isolated fuel and transmission/gear-oil circuits.

⚙️ Key Features

• Direct replacement for Detroit Diesel 23502664

• Approximately 3-inch tandem-cooler shell

• Separate fuel and gear-oil circuits

• Copper-nickel seawater tube bundle

• Designed for selected 6-53T marine propulsion packages

🧰 Kit / Assembly Contents

• 1 × Complete tandem cooler assembly - P/N 23502664

• 1 × isolated fuel-cooling circuit

• 1 × isolated transmission/gear-oil circuit

• 1 × common raw-water cooling circuit

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 23502664 (Detroit Diesel OEM tandem-cooler reference)

OEM / Related Numbers:

• 23502664CN

Aftermarket / Verified Equivalents:

• Lenco: LE23502664

• Seakamp copper-nickel replacement for OEM 23502664

• Mr Cool: MRC23502664CN

🚤 Compatibility

Commonly used on:

• Detroit Diesel 6-53T marine propulsion engines

Typically suits:

• Engine / Equipment models:

• 6-53T installations whose original tandem cooler is stamped 23502664

• Output / Engine Rating: Engine rating is marine calibration-dependent

• Engine / System Type: Inline six-cylinder two-stroke turbocharged Detroit Diesel marine engine

• Year Range: 6-53T production era

• Serial / Model Identification: Confirm fluid-port threads, water connections and mounting dimensions.

🔌 Function

The tandem cooler contains two isolated fluid circuits within one raw-water-cooled assembly. It controls the temperature of both connected systems while preventing the oils or fuel from mixing.

Common signs of failure:

• High temperature in either connected oil or fuel circuit

• Water contamination in transmission oil, steering fluid or fuel

• Oil or fuel appearing in the raw-water discharge

• Reduced system performance after prolonged operation

• External leakage, corrosion or failed pressure test

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging