I have a 1991 3.0l mercruiser with the alpha 1 gen 2 outdrive. I was given bad info, told that there was an impeller in the top cap of the outdrive. When I removed this cap there was nothing under there but bearings and a race in the cap. On the outer end you can see were the water flows from the water pump (which now I know is in the lower unit). Anyway when I replaced the cap it leaked. Read my seloc manual and it states that there is no need for a gasket. I suppose that would off set the bearing and race. So further research I found that there is supposed to be a rubber plug in the hole. Ordered the rubber plug, inserted it, torqued the screws to 20lbs, started the engine and yep the cap still leaks! The O ring around the lower unit oil section was also replaced to make sure water was not getting in the oil. But how do I stop it from leaking? It did not leak before I removed it. Can I use 3m 5200 around the rubber plug I inserted? Is the plug necessary since it wasn't there in the first place?
