119773-55750 Aftermarket Yanmar 4LHA/6LP(A) Fuel Cooler 55800 | Sawley's Select Marine Parts

🔧 Product Description

Aftermarket replacement Fuel Cooler - Replaces Part Number: 119773-55750

New copper-nickel fuel cooler replacing Yanmar 119773-55750 and 119773-55800. It is used on selected 4LHA and 6LP/6LPA engines to reduce fuel-return temperature using the raw-water circuit.

⚙️ Key Features

• Direct replacement for Yanmar 119773-55750

• Cross-references Yanmar 119773-55800

• Copper-nickel seawater core

• Used on selected 4LHA and 6LP/6LPA installations

• Replaceable sacrificial-zinc protection where fitted

🧰 Kit / Assembly Contents

• 1 × Complete fuel-cooler assembly - P/N 119773-55750

• 1 × Sacrificial anode - Yanmar P/N 119574-44150 where specified

• Fuel-line seals, seawater hoses and mounting hardware are renewed separately

🔄 Supersession & Cross Reference

OEM Supersession Chain:

• 119773-55750 ↔ Cross-references 119773-55800

OEM / Related Numbers:

• 11977355800

• 11977355750

• 119574-44150

Aftermarket / Verified Equivalents:

• Mr Cool: MRC119773-55750CN

• Lenco: LE119773-55750

• Seakamp copper-nickel replacement for OEM 119773-55750/55800

🚤 Compatibility

Commonly used on:

• Yanmar fuel-return cooling systems

Typically suits:

• Engine / Equipment models:

• 4LHA-DTZE(P), 4LHA-HTZE(P) and 4LHA-STZE(P)

• 6LP-DTE/DTZE, 6LP-STE/STZE and related 6LP variants

• 6LPA-DTP/DTZP, 6LPA-STP/STZP and STP2/STZP2 applications specifying the listed cooler

• Output / Engine Rating: Approximately 160HP - 315HP

• Engine / System Type: Four- or six-cylinder turbocharged marine diesel engine

• Year Range: 4LHA and 6LP/6LPA production era

• Serial / Model Identification: Confirm cooler ports and the exact OEM number because some installations use the component as a combined fuel/power-steering cooler.

🔌 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