Dongfeng LoongGine Engine parts Thermostat assembly 1306BF11-010

Engineered for accurate thermal regulation, this thermostat assembly features a bi-metallic or wax-element actuator (depending on engine model) calibrated to open at a precise temperature range of 82°C-88°C—Dongfeng LoongGine’s recommended optimal operating temperature for heavy-duty engines. The actuator’s response time is ≤3 seconds when exposed to temperature changes, ensuring rapid adjustment of coolant flow to maintain engine temperature within the ideal range. Rigorous testing shows the thermostat maintains a temperature deviation of ≤±2°C, preventing engine overheating (which causes piston ring wear) or underheating (which reduces fuel efficiency by 5-8%). By controlling coolant circulation between the engine and radiator, it also accelerates engine warm-up during cold starts—reducing friction-related wear in the first 5-10 minutes of operation and extending engine service life

The 1306BF11-010 thermostat assembly is built to withstand the high pressure and thermal stress of heavy-duty engine cooling systems. The main housing and valve plate are crafted from high-grade brass (H62) or stainless steel (304), selected for their excellent corrosion resistance to ethylene glycol-based coolants and anti-rust additives. The brass housing undergoes a nickel-plated finish to further enhance wear resistance and prevent scaling from mineral deposits in coolant. The wax-element actuator (if applicable) uses a high-temperature-resistant paraffin wax blend that remains stable at temperatures up to 130°C, avoiding leakage or performance degradation. The assembly’s internal spring is made of heat-treated stainless steel (17-7PH), ensuring consistent valve closing force even after 10,000+ cycles of opening and closing

To prevent coolant leakage—a critical issue for engine cooling systems—this thermostat assembly integrates a dual-seal system: a primary rubber O-ring and a secondary fiber gasket. The O-ring, made of nitrile rubber (NBR) or fluoroelastomer (FKM), is molded to the thermostat’s flange and creates a tight seal against the engine block’s coolant outlet. NBR O-rings excel in standard coolant environments (temperature range -40°C to 120°C), while FKM variants (for high-temperature engines) withstand up to 200°C. The secondary fiber gasket (reinforced with metal) is coated with a heat-activated adhesive, ensuring a permanent seal when compressed during installation. Both seals are designed to resist swelling or hardening from long-term exposure to coolant, maintaining leak-proof performance throughout the assembly’s service life (typically 60,000-80,000 kilometers under normal use)

Designed for user convenience, the 1306BF11-010 thermostat assembly supports straightforward installation that aligns with Dongfeng LoongGine’s original engine layout. It comes pre-assembled with all critical components (valve, actuator, spring, seals), eliminating the need for tedious individual part assembly. The assembly’s flange features clear alignment marks, ensuring quick positioning on the engine block—reducing installation time by 30% compared to generic thermostats. For maintenance, the assembly requires no periodic adjustment; its durable construction and corrosion-resistant materials minimize the need for premature replacement. The part is laser-marked with the part number, opening temperature, and material grade for easy identification and traceability. Additionally, it is compatible with all standard Dongfeng LoongGine coolant types (including organic acid technology/OAT coolants), eliminating the need for coolant system flushing during replacement