Reply To: Lower Seal 305098 Quad Ring issue Evinrude 18HP

Home › Forum › Ask A Member › Lower Seal 305098 Quad Ring issue Evinrude 18HP › Reply To: Lower Seal 305098 Quad Ring issue Evinrude 18HP

September 22, 2022 at 11:19 am #266463
frankr
Participant

    Lots of experience.  I prefer the Quad Ring.  The crankshaft moves up and down a bit within the allowable end play.  As it does, the carbon seal needs to remain in contact with the lower bearing ie, it needs to slide on the shaft.  The quad ring is better suited to that sliding action than an o-ring, which tends to roll.  At least that’s what I’ve been taught.  OMC did go to quad rings on their larger engines, I don’t know why they didn’t include the 18-20 which uses the same seal assy.