The McCormick 3687988M1 is a genuine OEM crankshaft rear oil seal, crucial for maintaining engine integrity and preventing oil leaks. This high-quality seal features an inner diameter of 110 mm, an outer diameter of 130 mm, and a width of 12 mm. It is a critical component for various Massey Ferguson tractor models, ensuring reliable performance and extended engine life. This part is also cross-referenced with other OEM part numbers for Landini, Deutz-Fahr, Perkins, Valtra, Fendt, and Claas applications.