Transom leak ?
 

OK. Another gremlin here. 1994 Bravo I. Leaking when I put it in the water, right around, (not, but near) the driveshaft. Replaced bellows, shift rubber housing, still leaks. Seems to be leaking around or near the "Y" pipe connection to the transom. Original Merc set up. Is there a gasket or some coupling to the transom for the Y pipe? ( I can't get or see there) I don't need the Y pipe. I can just plug the whole thing. ? Thoughts?

Gimbal Leak
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Do you have a y pipe, or block-off plate? The block-offs rot out. The y-pipe can too, but less often. Shift cable boot too. might end up pulling engine and launching boat so you can see what's going on.

Hate to say it but pulling the engine and checking is probably going to be your best bet. If the transom is getting soft I have seen them leak in the area of the Y pipe connection even though it's not. Good luck!

Transom is not soft, shifting boot replaced, and yes I have Y pipe with Corsa captains call. Leaks when I put in water and there is water coming in when I get a hose and a lot of water volume around the transom sprayed around the bellows. Water coming in bellow the driveshaft, so I assume its a y pipe thing.

From what I recall there is an o-ring behind the block off plate/y-pipe.

If your driveshaft bellows was leaking you would have issues with the gimble bearing due to lack of lubrication and rust. The other places are trim hose plate and water outlet on the inside of the transom assembly. I did one last year that had a leak were the outlet is bolted to the transom assembly (rotted from the inside out).

Another way to test is do it backwards. Park it on a boat ramp or some other fairly Steep Hill. Fire up a hose. Start filling the inside of the boat with the drain plug in. Lay down behind the boat and see where the water is coming out. Better with the drive off.

Odds are not very good that you can repair this without removing the engine.

Bellows was not leaking, I thought it was, replaced it and it was fine. Replaced the shift cable boot also, no issues. It's coming in somewhere else.

Sounds very similar to my leak. Won't leak on the hose, only in the water. Definitely leaks more the higher the rpms. Just putting around I barely get a drop.

Just trying to wrap my head around something here. Everyone else's bilge is bone dry other than the OP and member in post # 11?

ck the cooling hose connection on the housing, have seen them corrode, sometimes the housing is beyond repair as well, tuff with engine in, might try one of the remote camera's with flexable head to look where you can't...

Speedo hose?

you know, that's probably the one thing I have not tried to look at. Speedo is in the process of being disconnected anyway in favor of a rather inexpensive Faria GPS unit. Where ever the leak is coming from, it seems to have a little pressure behind (sprays) it because it leaves droplets over a fairly large area.

Steering pin worn out and leaking? Mine was letting in a lot of water until I got it replaced.

Speedo hoses very small and up fairly High where it comes through the transom. Yours sounds like a larger leak down lower. More than likely either the y-pipe itself, or between the transom assembly and the hull.

Outdrive is off. Boot, bone dry inside. Speedo, no leak, steering arm no leak, (leaks before water gets that high), sea water intake hose sound no rots, could be at he 45deg, connection in the transom plate, but I can feel it from inside, seems ok, hose tight. Water drip from hose at high volume in and around the gimble, and shoving the hose up as high as it goes, lot of water, drip inside bilge bellow driveshaft.
I might have to remove the gimble and the boot housing, but not sure how. Will research it a bit.

I had a Alpha that was leaking in the same spot (right under the driveshaft) that turned out to be the trim ram distribution plate seals. The water was coming from the area where the Y pipe went. Very easy fix from the outside.

Now, while the drive is off,, drive to the boat ramp and fire up the hose. Back it down the ramp and start filling the bilge. Wherever the water leaks in, it will run out. Either thru exhaust-engine comes out-or around edge of transom assy-might get lucky sealing it but probly not, or trim hose manifold-buy a gasket...don't fill it to the gimbal bearing or the starter. But it'll probly start running out as soon as you have 3 inches of water against the transom.

The gimbal boot won't cause a leak into the boat. It will run up against the gimbal bearing and wreck it, but would only barely dribble past it into the boat. I would think if it was the steering pin you would be able to see it come in at the steering arm. My fill the bilge idea won't work for that leak so good...

Found the leak. A little corrosion on the top left corner of the outer transom plate. I had to remove the bell housing to see it. Water gets in a small crack, gets behind the transom plate, flows down to the exhaust opening at the inner pate. That's why the leak seemed to be at a low point. Easy to fix, a bltch to get to. I should remove the gimbal ring for ease of access, but I will just deal with the trouble and bruised knuckles. I have a long fiberglass nozzle that mixes fiberglass as it goes through the tube and do a repair pretty easy.
Most repairs are easy, all research and finding the problems are the tough parts. :)

WOW, never would have thought about corrosion causing a crack on such a new boat. I hope it is not a indicator of a bigger problem like a rotten transom flexing that caused the crack in the corrosion area.

The boat is1994, LMAO but I will show a pic of the u joint, it's like new. The corrosion spot is almost like a little crack in the thin area of the outer transom plate. The rest of the plate looks good.

they usually corrode from the water passage out into the housing...the backside may be completly eaten away

Actually both plates looks really good, except the little crack on the outer at a corner.