Premium Heavy Equipment Sensor Solution for E320D S6K Engine Systems
Reliable engine cooling performance starts with accurate data. For heavy equipment operators using 5I-7578 or the 34390-00800 part numbers, ensuring the coolant temperature is correctly reported to the ECM is vital for preventing overheating and engine failure. Our 2979315 (also recognized as 2979315 without symbols) is a precision-engineered aftermarket solution that meets or exceeds OEM standards for Caterpillar excavators.
This Water Temperature Sensor (M20 Thread) is specifically designed for high-vibration environments, providing stable electrical signals even under extreme thermal cycling. Whether you are performing a routine maintenance check or a complete engine overhaul, this sensor ensures your machine stays within optimal operating parameters.
| Model NO. | E312, E320B, E320C, E320D, S4K, S6K Engine |
| Product Name | Water Temperature Sensor (Thread M20) |
| Part Number | 5I-7578 / 5I7578 / 34390-00800 / 3439000800 / 2979315 |
| Condition | Brand New, OEM Standard Replacement |
| MOQ | 1 Piece |
| Payment Terms | T/T, Western Union, MoneyGram |
| Delivery Methods | DHL, Fedex, EMS, UPS, Air/Sea Cargo |
| Application | Engine rebuild, Excavator maintenance, cooling system repair |
| Feature | Standard Sensors | Our 5I-7578 Replacement |
|---|---|---|
| Thread Precision | Loose fitting, prone to leaks | M20 High-precision machining for 100% seal |
| Signal Response | Delayed or intermittent | Real-time thermal response with gold-plated pins |
| Durability | Plastic housing prone to cracking | Hardened brass body for maximum corrosion resistance |
| Fitment | General purpose, requires modification | Drop-in replacement for E320D / S6K Engine |
| Cost Efficiency | High OEM markup | Factory-direct pricing for fleet maintenance |
| Quality Assurance | Variable QC | 100% tested before dispatch |
This is often caused by a faulty 5I-7578 sensor or damaged wiring. A short in the temperature sensor will send a maximum voltage signal to the ECM, triggering a false high-temperature alarm. We recommend checking the resistance of the sensor against the manufacturer's spec table before replacement.
Yes. The ECM uses temperature data to adjust fuel injection timing. If the 34390-00800 sensor is providing inaccurate data, the engine may struggle with fuel ratios, leading to poor idle or stalling. Replacing the sensor is a cost-effective first step in troubleshooting.
OEM-standard tri-metal structure: Our sensors use a specialized alloy blend that ensures thermal conductivity is identical to the original part, preventing "sensor lag."
Trusted by repair shops & equipment fleets: Thousands of units have been deployed in harsh mining and construction sites worldwide, proving their reliability in the field.
Not sure how this issue affects your equipment?
Our team helps operators:
Identify potential risks during maintenance
Recommend suitable replacement parts if needed
Support both inspection advice and parts supply
Expert Tip: Always clean the M20 thread port before installing the 2979315 sensor to ensure a perfect ground connection and leak-free seal.
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