142-5703 Aftermarket Caterpillar Transmission Cooler 3406, C15 | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Transmission Oil Cooler - Replaces Part Number: 142-5703

New copper-nickel transmission-oil cooler replacing Caterpillar 142-5703. It is a direct-fit approximately 4-inch × 12-inch marine cooler for 3406E and C15 installations.

⚙️ Key Features

• Direct replacement for Caterpillar 142-5703

• Approximately 4-inch diameter × 12-inch cooler body

• Copper-nickel marine tube bundle

• Matches original port orientation and mounting geometry

• Designed for Caterpillar 3406E and C15 transmission-oil circuits

🧰 Kit / Assembly Contents

• 1 × Complete transmission-oil cooler assembly - P/N 142-5703

• 1 × Integrated copper-nickel core

• Oil seals, coolant/raw-water hoses and mounting hardware are renewed separately

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 142-5703 (Caterpillar cooler-group reference)

OEM / Related Numbers:

• 1425703

• 142-3949

• 4P-7731 related Caterpillar transmission-cooler core family

Aftermarket / Verified Equivalents:

• Seakamp: 142-5703 copper-nickel cooler

• Lenco: LE142-5703

• Mr Cool: MRC142-5703CN

🚤 Compatibility

Commonly used on:

• Caterpillar marine propulsion packages

Typically suits:

• Engine / Equipment models:

• Caterpillar 3406E

• Caterpillar C15 and C-15

• Selected 3406/C15 marine transmissions whose arrangement specifies cooler group 142-5703

• Output / Engine Rating: Engine rating is arrangement-dependent

• Engine / System Type: Inline six-cylinder turbocharged marine diesel with separate marine transmission

• Year Range: 3406E/C15 production era

• Serial / Model Identification: Confirm engine arrangement number, transmission model and OEM cooler-group number.

🔌 Function

The cooler transfers heat from transmission or reduction-gear oil into the raw-water circuit. Correct oil temperature protects clutches, bearings, seals and hydraulic control components.

Common signs of failure:

• High transmission or reduction-gear oil temperature

• Burnt, darkened or aerated gear oil

• Delayed engagement, slipping or abnormal gear noise when hot

• Water-contaminated or milky transmission oil

• External oil leakage, corrosion or failed pressure test

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging