Temperature Sensor 120130-91370

Function and technical context

This temperature sensor is part of the engine monitoring system, responsible for measuring and transmitting the temperature of the cooling water or block to the boat's control panel. It works within the electrical circuit of the marine engine, specifically in the wiring harness and sensors (section 39 of the parts list, position 18), sending a continuous signal that allows the operator to detect thermal variations in real time. If the sensor fails or presents erroneous readings, the warning system stops working properly, which can prevent early detection of overheating and lead to serious engine damage, such as melted gaskets or block seizure.

When to replace this part?

The most common symptoms of a faulty temperature sensor include erratic or fixed readings on the panel temperature gauge, unjustified activation of overtemperature alarms or, conversely, a complete absence of signal on the dial. It is recommended to check the condition of the sensor during each seasonal maintenance, especially if corrosion is detected on the terminals or mounting threads, since exposure to salt water accelerates deterioration. Replacing it preventively in the event of any symptom avoids being left without thermal monitoring during navigation, with the risk that this entails for the engine.