The colloquial term "Ferguson 28" is sometimes used in Australia and New Zealand for later models of the TE-20 including the petrol TEA-20 and diesel TEF-20.[citation needed] "Ferguson 28" has never been an official tractor model designation. Initially the TE20 had the 'Continental' Z120 23HP engine, as did the Detroit-built TO20 introduced a year later. The 80 mm bore 'Standard' petrol engine was phased in in mid-1947 as the TEA-20, approximately 3,000 of the 20,500 tractors built to 31 December 1947 being TEA-20s. Subsequent to the introduction of the 85 mm bore TED-20 in April 1949, the petrol engine was also made with an 85 mm bore, which increased its power to just over 28 hp. The term "Fergie 28" refers to the nominal horsepower of the later range of tractors. To benefit from the reputation of the later models in the used tractor market, the 23HP TE-20 is often advertised simply as TE-20; only very rarely is it referred to in Australia as a "Ferguson 23". In North America the 'Standard' petrol-engined TEA-20s with the 85 mm bore were known and advertised as TE-2085s.

The Massey Ferguson TE-20 tractor, a vintage model produced in the 1940s and 1950s, does not typically have a MAP (Manifold Absolute Pressure) sensor, as this technology is more common in modern vehicles with electronic fuel injection systems. Instead, the TE-20 is equipped with a more traditional carbureted engine. However, if you're experiencing issues that you believe might be related to a MAP sensor or similar component on a more modern tractor or a retrofitted system, hereâs a general guide to addressing sensor-related issues. ### General Steps to Diagnose and Replace a MAP Sensor: 1. **Identify the Sensor Location**: - If your TE-20 has been modified with a MAP sensor, locate it on the intake manifold or near the throttle body. It usually has an electrical connector and a vacuum line connected to it. 2. **Inspect the Wiring and Connections**: - Check for any damaged or corroded wires connected to the sensor. - Ensure that the electrical connector is secure and clean. Sometimes, simply cleaning the connector can resolve issues. 3. **Check for Vacuum Leaks**: - If the MAP sensor is connected to a vacuum line, inspect the line for cracks or disconnections. A vacuum leak can cause inaccurate readings. 4. **Testing the MAP Sensor**: - Use a multimeter to test the sensor. You can usually check the voltage output while the engine is running. Refer to the specific voltage specifications for your model. - If the readings are outside the specified range, the sensor may need to be replaced. 5. **Remove the Old Sensor**: - Disconnect the electrical connector and vacuum line from the MAP sensor. - Unbolt or unscrew the sensor from its mounting location. 6. **Install the New Sensor**: - Position the new MAP sensor in place and secure it with bolts or screws. - Reconnect the vacuum line and electrical connector. 7. **Test the System**: - Start the engine and check for any error codes if your system has a diagnostic capability. - Monitor the engine performance to ensure that the replacement has resolved the issue. 8. **Clear Any Diagnostic Codes** (if applicable): - If your tractor is equipped with an electronic control unit (ECU) that logs error codes, use a diagnostic tool to clear codes after replacing the sensor. ### Additional Notes: - If your TE-20 has not been modified and is still running on a carburetor, you might want to check other components that could affect performance, such as the carburetor itself, fuel lines, and filters. - Always refer to a service manual specific to your tractor for detailed specifications and procedures. ### Conclusion: Remember, the Massey Ferguson TE-20 tractor is a classic model, and modifications may vary widely. If youâre not comfortable working on the tractor or if the issue persists after checking the sensor, itâs advisable to consult with a professional mechanic familiar with vintage tractors.