The injectors are retained to the rail as an assembly before installation to the cylinder head. Each injector in turn must be held in position on the rail, and the injector retaining clip must be installed or removed by hand. GM-50791-100 installs onto the forcing screw of the GM-50791 installer to fit the injectors in the 2.0L-T LSY engine.
GM-50791 holds the injector in position, allowing the retaining clip to be removed or installed. GM-50791 and GM-50791-100 are tightened over the injector body as an assembly, without contacting the tip, and can be adjusted to all