Description:
PP-119773-55800 Yanmar Fuel Cooler Assembly
The PP-119773-55800 Yanmar Fuel Cooler Assembly is a dedicated marine fuel heat exchanger designed to regulate diesel fuel temperature on Yanmar 6LP and 6LPA series marine diesel engines.
Installed in the fuel return circuit, this cooler reduces fuel temperature before it is routed back to the fuel system, helping to prevent vapour formation, maintain consistent fuel density, and stabilise injection performance—particularly under high load and elevated engine room temperatures.
Manufactured as a shell and tube style cooler, fuel passes through an internal core while raw water circulates around the exterior, efficiently dissipating excess heat into the cooling system. This process supports reliable combustion, improved throttle response, and protection of high pressure injector components.
Built to OEM dimensional and flow specifications, the 119773 55800 is a direct fit replacement requiring no modification to existing brackets, hose routing, or plumbing. It is commonly replaced during major servicing or when internal corrosion, blockage, or zinc neglect reduces cooling efficiency.
Widely used across both mechanical and electronically controlled 6LP / 6LPA engines, this fuel cooler is a proven and dependable solution
Suits Yanmar:
• 6LP STP
• 6LP STE
• 6LPA STP
• 6LPA STE
• 6LP Series marine diesel engines
• 6LPA Series (mechanical and electronic variants fitted with external fuel cooler)
Replaces / Supersedes:
• Yanmar: 119773-55750
• Yanmar: 119773-55800