Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 180Get this manual
5If teflon seal requires replacement, use teflon ring installation tool 91-851980 to slide new seal onto injectorFollowing installation of teflon ring, the teflon ring sizing tool (91-851980-1) can be used to compress the teflon seal to aid in the installation of the injector into the cylinder head1997 Model
6An ohm test of the direct injector may be made by connecting test leads to injector terminalsOhm reading should be 1.3 0.3 ohm