Nothing's more frustrating than an engine that won't warm up properly or runs too cool all day. If you've noticed poor fuel economy, white smoke that hangs around too long, or your tractor just doesn't have the pep it used to, a faulty thermostat might be the culprit. This 78-degree thermostat gets your engine to its proper operating temperature where it burns clean and runs efficiently. What You're Getting Precision temperature control that opens at exactly 77-81 degrees Celsius for optimal engine performance Large 69.85mm diameter design provides excellent coolant flow when fully open Quality wax pellet construction responds accurately to temperature changes cycle after cycle Direct replacement that restores proper warm-up timing and temperature regulation Built to handle the thermal cycling and vibration of agricultural work Built for Real Farm Work This thermostat fits the dependable Perkins 203 engines found in various Massey Ferguson models across their 100, 200, 500, and 700 series. Whether you're running a compact utility tractor for daily chores or putting hours on a larger machine during harvest, maintaining proper operating temperature keeps your engine happy and extends its life. Made to Last The wax pellet technology is proven and reliable - it expands predictably as coolant heats up and opens the valve at precisely the right temperature. This design has been keeping engines cool for decades because it works. The construction handles the constant heating and cooling cycles that come with farm work. Installation Notes Replacement takes about 30 minutes once you drain coolant below the housing level. The spring side faces the engine block, with the sensing element toward the radiator - installing it backward blocks all coolant flow. Test your new thermostat in hot water before installation to verify it opens at the right temperature, and use fresh coolant with a new gasket for the best seal.