3349370 / 4989987 Aftermarket Cummins QSM11 Fuel Cooler 4 x 8.25 in | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement High-Pressure Fuel Cooler - Replaces Part Number: 3349370

New copper-nickel high-pressure fuel cooler replacing Cummins 3349370 and 4989987. The approximately 4-inch shell with an 8.25-inch bundle is designed for QSM11 fuel cooling and uses internal baffling suited to the high-pressure circuit.

⚙️ Key Features

• Replaces Cummins 3349370 and 4989987

• Approximately 4-inch shell with 8.25-inch bundle

• Approximately 14.5-inch overall length

• Approximately 1/2-inch NPT fuel ports and 2.5-inch water connections

• High-pressure baffled copper-nickel construction

🧰 Kit / Assembly Contents

• 1 × Complete fuel-cooler assembly - P/N 3349370 / 4989987

• 1 × high-pressure internal fuel circuit

• 1 × copper-nickel seawater tube bundle

• Pipe fittings, seals, zincs and mounting hardware are renewed separately

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 4989987 → Later service reference associated with 3349370

• 3349370 ↔ Cross-references Sendure 13208-1-7

OEM / Related Numbers:

• 4989987

• 13208-1-7

Aftermarket / Verified Equivalents:

• Sendure: 13208-1-7

• Mr Cool: MRC3349370CN

• Lenco: LE3349370

🚤 Compatibility

Commonly used on:

• Cummins QSM11 marine diesel engines

Typically suits:

• Engine / Equipment models:

• QSM11 CM570

• QSM11 CM876

• QSM11 installations whose fuel-cooling arrangement specifies 3349370 or 4989987

• Output / Engine Rating: Approximately 610HP - 715HP on common marine calibrations

• Engine / System Type: Inline six-cylinder turbocharged common-rail marine diesel engine

• Year Range: QSM11 production; calibration- and serial-dependent

• Serial / Model Identification: Confirm engine serial, fuel-port thread and cooler pressure rating.

🔌 Function

The cooler removes heat from the fuel return or supply circuit before the fuel returns to the tank or injection system. Cooler fuel improves density, reduces vapour formation and supports consistent power under sustained load.

Common signs of failure:

• Power loss or unstable running after prolonged operation

• Hot-start difficulty or fuel-vapour symptoms

• Fuel leakage into the raw-water circuit

• Saltwater entering the fuel system

• Corrosion, restricted water flow or failed pressure test

📦 Condition

• New aftermarket replacement part

• Brand new

• Supplied in original or equivalent packaging