Home › Forum › Ask A Member › OMC 9.9 / 15 impeller housing related questions › Re: OMC 9.9 / 15 impeller housing related questions
The larger one. It’s to help guide the water tube in when putting the gearcase back on. You can use the smaller one, but it can be hard to get things lined up. You might want to spray a little WD-40 or PB blaster on the rubber grommet orifice to allow the copper tube to settle in more easily. Sometimes they can pierce the rubber if forced in, or worse yet, fold over and actually block water flow through the motor (that’s if the tube is misaligned and gearcase forced on during reassembly).
There shouldn’t be glue in the SS cup in the impeller housing, at least I’ve never seen it before. You just set it in there and re-assemble. If it’s not staying in there for some reason, you can always use a little petroleum jelly to hold it in place temporarily.