This injector washer seals the interface between the fuel injector and the cylinder head in the host tractor's engine. It compresses under the injector clamp load to prevent combustion gas blow-by and fuel leakage from the injector bore. A worn or missing washer causes compression loss, hard starting, and a visible soot trail around the injector. As an original AGCO component, the washer is formed to the same thickness and concentricity as the production part, so the injector protrusion height and spray pattern remain within specification. Replace the washer every time the injector is removed; do not reuse the old one.