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Electrical components of the excavator – 4LE2 – Coolant temperature sensor 8-97078592-0 – Water temperature sensor component
Isuzu 4LE2 Engine Coolant Temperature Sensor (Part No. 8-97078592-0) is a core sensing component of the excavator electrical system. It monitors engine coolant temperature in real time and transmits signals to the ECU to control fuel injection, fan speed, etc., ensuring the engine operates stably within the optimal temperature range.
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Product Description
- Part Number: 8-97078592-0 (also 8970785920)
- Application: Isuzu 4LE2 engine (widely used in mini excavators such as Kobelco SK55, SK60, Sany SY55, etc.)
- Type: Thermistor-type Coolant Temperature Sensor (Water Temperature Sensor)
- Material: Brass housing + thermistor core, corrosion-resistant and fast heat-conducting
- Temperature Sensing: Converts coolant temperature into electrical signals using the thermistor’s temperature-dependent resistance, and feeds real-time data to the engine ECU.
- Operating Condition Control: The ECU adjusts fuel injection, ignition timing, and cooling fan speed based on the water temperature signal to prevent engine overheating or overcooling.
- Fault Alarm: Triggers the dashboard water temperature warning light when the water temperature exceeds the safe range, alerting the operator to avoid serious failures such as cylinder scoring or bearing seizure.
- Cold Start Assistance: Provides a cold-engine signal to the ECU at low temperatures, enriching the air-fuel mixture to improve cold-start performance.
- Brass Housing: Excellent thermal conductivity and corrosion resistance, adapting to the harsh high-temperature, humid, and oily environment of the engine compartment.
- Threaded Mounting: Standard external thread design, directly screwed into the engine block or thermostat housing, with reliable sealing and easy installation.
- Single-Pin Connector: Tail single-pin interface, precisely matching the original wiring harness, ensuring stable signal transmission and strong anti-interference capability.
- High-Precision Thermistor: Sensitive temperature response and small measurement error, enabling the ECU to accurately control engine operating conditions.
- Used for repair and replacement of the electrical system in mini excavators equipped with Isuzu 4LE2 engines, resolving faults such as malfunctioning water temperature gauge, constant warning light, engine overheating, hard cold starting, and increased fuel consumption.
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