Cummins Water Temperature Sensor 3967250 3845N05-010 622-817 VDO | Water Temperature Sensor Plug, Including Water Temperature Alarm Switch, Thread NPT1/2 Diameter 21 mm

This water temperature sensor is a replacement component precisely engineered for Cummins diesel engines. The sensor is responsible for monitoring the temperature of the engine coolant and transmitting this signal to the dashboard temperature gauge or the Engine Control Unit . Accurate temperature readings are critical for ensuring the proper operation of the engine. If the sensor malfunctions, you may observe issues such as inaccurate temperature readings, the temperature gauge consistently displaying a low temperature, a failure of the overheating warning to trigger, or a decline in engine performance. This sensor is available under several part numbers, including 3967250, 3845N05-010, and 622-817. It is manufactured in strict compliance with the brand's technical specifications. It represents a renowned and trusted brand in the field of engine sensors and instrumentation. The quality of this sensor meets or exceeds Original Equipment (OE) standards; it serves as a direct replacement for the original Cummins sensor and requires no modifications during installation. The sensor features a built-in water temperature alarm switch. When the engine coolant temperature exceeds the safe operating limit, this switch immediately activates a warning light or buzzer to alert the operator. This alarm function provides an additional layer of protection for the engine, effectively preventing overheating-related failures. Engine overheating can lead to damage to the head gasket or cylinders, and may even result in the complete destruction of the engine. Equipping your vehicle with a properly functioning water temperature sensor and alarm switch can help you avoid costly repair expenses. The sensor features an NPT 1/2 thread specification—a standard tapered pipe thread. NPT threads are designed to create a self-sealing connection as they are tightened. With a diameter of 21 millimeters, the sensor's dimensions precisely match those of the original Cummins sensor. The sensor body is constructed from durable materials, offering excellent resistance to corrosion and vibration, thereby ensuring stable and reliable operation within the typical temperature range of a diesel engine's cooling system. The installation process is simple and straightforward. First, drain a portion of the coolant from the radiator to ensure the fluid level falls below the sensor's mounting port. Use a wrench to remove the old sensor. Clean the threads within the mounting port. Apply an appropriate amount of thread sealant to the NPT threads of the new sensor. Do not use PTFE tape (plumber's tape) on the threads, as this may interfere with the sensor's ground connection. First, hand-thread the sensor into the mounting hole, then use a wrench to tighten it. Exercise caution to avoid overtightening, which can result from excessive force. If necessary, top up the coolant level. Start the engine and check for any leaks. As the engine temperature gradually rises, verify that the temperature gauge on the dashboard displays a normal reading. This product is compatible with all Cummins diesel engines that utilize sensor models 3967250, 3845N05-010, or 622-817. These sensors are widely used in Cummins engines powering trucks, buses, construction machinery, generator sets, agricultural equipment, and marine vessels. Before placing an order, please be sure to verify the thread size and connector type of your existing sensor. It is highly recommended to keep a spare water temperature sensor stocked in your service vehicle. Engine overheating often occurs without warning; having a replacement sensor on hand allows you to address the issue immediately, without having to wait for parts to be delivered. This not only effectively minimizes downtime but also ensures that your equipment continues to operate efficiently. Order your Cummins water temperature sensor (Model 3967250) today. This product is also available under model numbers 3845N05-010 or VDO 622-817. The unit includes a water temperature alarm switch and features NPT1/2 threads with a diameter of 21 mm. Provide comprehensive protection for your Cummins engine and prevent damage caused by overheating.

• The main body of the product is made of high-quality raw materials, with excellent anti-seismic performance, long service life, simple assembly process, stable quality, wide operating temperature range, etc. It is widely used in the fields of vehicle and ship engineering pipeline water treatment engineering, industrial process inspection and control, etc.
• Protection level: IP66 Working voltage: 12~24V Conductive power: <5W Working temperature: -25~120℃ (120CMAX1H) Measuring range: 40~120℃ or 100~250°F Alarm: 96℃ Output signal: 287.4~22.4Q Thread diameter: NPT1/2
• Wiring: G-signal line WK-alarm device (optional) Casing-negative pole (ground)