1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your NORXI Cylinder Head Temperature Sensor. This sensor is designed to accurately measure engine temperature, ensuring optimal performance and preventing overheating in a wide range of applications.
The NORXI Cylinder Head Temperature Sensor is suitable for various engines, including those found in motorcycles, cars, boats, lawn mowers, tractors, chainsaws, generators, off-road motorcycles, ATVs, scooters, and outboards.
2. Product Overview
The NORXI Cylinder Head Temperature Sensor is a robust and reliable device designed for precise temperature monitoring. It features a durable construction suitable for demanding engine environments.

Image 2.1: Two NORXI Cylinder Head Temperature Sensors. Each sensor consists of a red ring terminal probe, a white braided wire, and a black electrical connector.
2.1 Components
- Temperature Probe: Available in 10mm and 14mm ring terminal sizes to accommodate different bolt diameters.
- Sensor Wire: Connects the probe to the electrical system.
- Connector: Ensures a secure electrical connection.

Image 2.2: Sensor Size Diagram. This image illustrates the two available ring terminal sizes (14mm and 10mm) and the overall length of the sensor assembly, which is 146mm.

Image 2.3: Sensor Thread Specifications. This diagram details the thread dimensions of the sensor probe, showing a 5mm thread diameter and a 0.8mm thread pitch. It also indicates the sensor's design for high temperatures, up to 200°C.
3. Specifications
| Feature | Specification |
|---|---|
| Model Number | CHT |
| Measuring Temperature Range | 0-150°C (32-248°F) |
| Material | Polyphenylene Sulfide (PPS) and Stainless Steel |
| Product Dimensions (L x W x H) | 7.09 x 0.79 x 0.98 inches |
| Item Weight | 0.03 Kilograms (1.06 ounces) |
| Thread Diameter | 5mm |
| Thread Pitch | 0.8mm |
4. Setup and Installation
Proper installation is crucial for accurate temperature readings and the longevity of the sensor. Always ensure the engine is cool before beginning installation.
4.1 Installation Steps
- Identify Installation Point: The sensor is typically installed under a spark plug or another suitable engine bolt that allows direct contact with the cylinder head for accurate temperature measurement.
- Prepare the Area: Carefully remove the spark plug or bolt where the sensor will be installed. Ensure the area is clean and free of debris.
- Position the Sensor: Place the ring terminal of the sensor over the spark plug or bolt. Ensure the sensor sits flush against the cylinder head surface.
- Reinstall Spark Plug/Bolt: Reinstall the spark plug or bolt, tightening it to the manufacturer's specifications. Ensure the sensor wire is not pinched or damaged during this process.
- Connect Wiring: Route the sensor wire away from hot or moving engine parts. Connect the sensor's electrical connector to your compatible temperature gauge or monitoring system.

Image 4.1: Installation Example. This diagram shows how the sensor's ring terminal (labeled 'Adapter') is placed under a spark plug, allowing the 'Sensor Wire' to connect to a temperature display unit.
5. Operating Instructions
Once installed and connected to a compatible temperature gauge, the NORXI Cylinder Head Temperature Sensor will continuously monitor and transmit the engine's temperature.
- Temperature Display: The temperature reading will be displayed on your connected gauge or monitoring device.
- Monitoring Range: The sensor is designed to measure temperatures within the range of 0-150°C (32-248°F).
- Normal Operation: Consult your engine's service manual for its normal operating temperature range. Deviations from this range may indicate an issue.
6. Maintenance
The NORXI Cylinder Head Temperature Sensor requires minimal maintenance. Regular checks can help ensure its continued accuracy and performance.
- Visual Inspection: Periodically inspect the sensor and its wiring for any signs of physical damage, corrosion, or loose connections.
- Cleanliness: Keep the sensor probe and connections clean from dirt, oil, and other contaminants that could affect readings or connection integrity.
- Connection Check: Ensure the electrical connector remains securely attached to your temperature gauge or monitoring system.
7. Troubleshooting
If you experience issues with your NORXI Cylinder Head Temperature Sensor, consider the following troubleshooting steps:
- No Reading or Incorrect Reading:
- Check all electrical connections to ensure they are secure and free of corrosion.
- Verify that the sensor wire is not damaged (cut, pinched, or frayed).
- Ensure the sensor probe is making good contact with the cylinder head.
- Confirm compatibility between the sensor and your temperature gauge/monitoring system.
- Intermittent Readings:
- Inspect wiring for loose connections or partial breaks.
- Check for electromagnetic interference from other engine components.
- Physical Damage: If the sensor or wiring is physically damaged, it may need to be replaced.
If troubleshooting steps do not resolve the issue, contact NORXI customer support or your retailer for further assistance.
8. Warranty and Support
For information regarding the product warranty, please refer to the warranty documentation provided at the time of purchase or visit the official NORXI website. Support inquiries can be directed to your retailer or the NORXI customer service department.
For additional product information or to explore other NORXI products, please visit the NORXI Store on Amazon.