The McCormick 3656891M1 spark plug is an essential OEM component designed for reliable ignition in various agricultural and industrial machines equipped with Perkins engines. This genuine spark plug ensures optimal engine performance and efficiency across a wide range of Massey Ferguson, Landini, McCormick, Valtra, and Fendt tractor models. It features a total length of 80 mm, a thread length of 19 mm, and a thread diameter of 18 mm, requiring a 21 mm wrench for installation. Weighing 0.07 kg, this spark plug is built to meet original equipment specifications for durability and consistent operation.