Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 191Get this manual
DIRECT FUEL INJECTION
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 head
91-851980-1
aTeflon Sealing RingO-ringTeflon Seal
dSeal Installation Tool (91-851980)O-ringTeflon Ring Sizing Tool (91-851980-1)