Gear oil leak... again.

Gen2mama

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Aug 28, 2020
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5
I have an Alpha One Gen 2, (1992 Bayliner, Ceira, 5.7L, 25ft) . I brought it to a shop to have the corroded LED drain plug removed from the transom. I feel confident doing motor work but I didnt want to damage the transom. (It was moored all season and corroded horribly).
Well, I get it back and the mechanic told me I have a gear oil leak. This wasnt there before. I know... I had my head UNDER the motor contemplating on whether I could do the drain plug myself.
I do a pressure test. It's leaking at the shift shaft bushing and my speedo line is now broke. I pulled the shift shaft, replaced the bushing, seals and noticed the sleeve had been pulled off the original one. I place the sleeve on and leak there was gone.
I move onto the impeller, I replaced the housing, impeller, the carrier assembly (as I still had a metal one) and sat the seal. The carrier sat itself and you could feel it slide into place with a little pressure and sat flush BUT was raising my water pump housing about a quarter of an inch off the surface. (Thus any force on the housing would stop the impeller from spinning properly) So I used ultra black rtv to seal in the gap between the housing unit and the leg and the gasket and housing. Problem solved. It sat great, the impeller could still move and carrier assembly still sits flush. I double check my quad ring is in place and I put the lower back on the upper. I pressure test. It holds. I fill it back up and it's holding great..... four days later, I have gear oil coming out of my water intake holes. :( now I have the motor elevated just enough where if it were the upper seals, it would run down towards my shift shaft. I put extended bolts in my unit so I can just lower it slightly to get an inside look and the quad seal looks in place still, although there is oil on the top of it, the impeller housing looks like its dry and the front shift shaft is bone dry.
any helpful suggestions would be greatly appreciated!
 

Rick Stephens

Admiral
Joined
Aug 13, 2013
Messages
6,118
You have completely lost me with what you modified and used RTV on. Personally, I can't think of anywhere I would put silicon on a sterndrive. Longer bolts, housing not flush. All that is going right over my head.

All that said though, if you have a leak you gotta drain and pressure test. Everything else is guesswork. A crack, a bad seal, who knows until you pressure test. I had one that was hard enough to find that I dunked the drive in a horse water trough to pressure test and find the leaking air. You'll find it. And it doesn't sound likely that a transom plug job damaged a seal in your drive.
 

Gen2mama

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Aug 28, 2020
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Thanks for the input. I could have left the plug topic out. As it's irrelevant. That that was just to place the timing on the leak and I'm truly hoping the shop hadn't backed it up into something when it was there. I didnt need to use longer bolts and the amount of rtv used was the equivalent to an extra gasket size (or one last bolt turn on the holding screw) nothing major. I had pressure tested it and it held after replacing seals. For a full day. That's what has me stumped. But I'll be doing it again and seeing if I get a different result.
 

Gen2mama

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Aug 28, 2020
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5
Pressure test is showing air bubbles coming from prop shaft. Is this possible to have these two seals leak UPWARD into the water pickups?!?!?!? I always assumed it's a down and out the shaft?
 
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