Cummins engine parts Thermostat assembly C5337966 in stocked

A core strength of the C5337966 assembly is its accurate temperature regulation, critical for Cummins engine performance. It features a bi-metallic sensing element that begins opening at 82°C (180°F) and fully opens at 95°C (203°F)—the optimal range for Cummins engines to balance fuel efficiency and emissions. The thermostat’s valve opens smoothly with a linear response to temperature changes, preventing sudden coolant flow surges that could cause engine overcooling or overheating. This precision ensures the engine reaches operating temperature 15% faster during cold starts (reducing wear) and maintains stable temperatures under load (e.g., heavy hauling or high-speed operation). For operators, this translates to improved fuel economy (up to 3%) and reduced exhaust emissions, aligning with environmental regulations

Built to withstand Cummins engines’ rigorous operating conditions, the C5337966 assembly uses industrial-grade materials. The thermostat housing is made of die-cast aluminum alloy (ADC12), offering high heat resistance (up to 150°C) and corrosion protection against coolant chemicals. The valve disc is crafted from stainless steel (304 grade), resisting rust and wear even after 100,000+ cycles of opening and closing. The bi-metallic element is encapsulated in a copper sleeve, enhancing thermal conductivity and preventing damage from coolant contaminants. Rigorous durability tests (5,000+ thermal cycles, 1,000-hour pressure testing at 150kPa) confirm the assembly performs reliably for 80,000+ km, reducing maintenance frequency and replacement costs

The C5337966 assembly plays a key role in protecting Cummins engines from damage. By controlling coolant flow, it prevents engine overheating (a leading cause of cylinder head warping or piston seizure) during high-load operation. During cold starts, it restricts coolant flow to the radiator, allowing the engine to warm up quickly—reducing friction between moving parts (e.g., pistons, bearings) and extending their lifespan. The thermostat also includes a pressure relief valve that releases excess coolant pressure (above 180kPa), preventing damage to hoses and the radiator. For fleet operators, this protection minimizes unplanned downtime and costly engine repairs, ensuring reliable performance in demanding applications (e.g., construction, trucking, or power generation)

The C5337966 assembly is designed for hassle-free installation, saving time for technicians. It comes pre-assembled with the thermostat valve, housing, gasket, and mounting hardware (bolts, washers), eliminating the need for separate parts sourcing. The housing’s clear markings indicate inlet/outlet directions, preventing reverse installation. Installation requires only basic tools (socket wrench, torque wrench) and follows Cummins’ standard procedures—taking 45 minutes or less for a skilled technician. A detailed instruction manual (with torque specifications: 25-30 N·m for mounting bolts) is included, guiding proper fitment. This ease of installation reduces engine downtime, critical for operators relying on Cummins-powered equipment for time-sensitive tasks