Mercruiser Sterndrive Gear Oil Leaking by Prop

[nola mike]

Yeah, a lot of folks post regarding the o ring on the drive shaft needing abatement.

If mercury has disregarded the o ring I've never heard of such, it's still provided with the oem w/p kit and always gets installed on my bench. Never once had an issue regarding the o ring after hundreds of installs, ymmv

Funny question, does any long time poster on this forum know the reason why mercury uses the o ring?

Well, the newer shafts don't have a groove for the o ring, and I had it get caught in that seal as well before. Guess that the o ring is to help seal that shaft cavity from water since the seal is oriented "wrong"

 

[1985 Century Mustang]

So you can see that damaged o ring on the gear shaft, looks like it got caught in that lower seal (which is why Merc deleted it). That seal keeps water from the upper drive shaft. Good chance that the shaft is rusted/damaged. If so, you'll need to install a speedi sleeve on it if it's grooved. You can drive the upper seal in with a socket if you haven't already ordered the special tool. The shift shaft seal in the lower can be a pain; you can pressure test the lower separately to see if that seal is leaking

I ordered the tool to set the lower oil seal. I don't wanna screw anything up.

 

[1985 Century Mustang]

You wont be able to get a socket on the annode bolt if you use a hex head bolt, hole in outdrive housing is too small . Clean yours up with a wire wheel or die.

if a sockethead cap screw is too pricey boating may not be a good hobby for you

That's what I presumed. For what it's worth, I saw a few anode kits on Amazon with the 3/8 bolt for under $20.

 

[Grub54891]

That's what I presumed. For what it's worth, I saw a few anode kits on Amazon with the 3/8 bolt for under $20.

Yeah there is bolts on some, they make the head smaller to be able to get the socket in. Don’t see it real often but they are out there.

 

[Scott06]

That's what I presumed. For what it's worth, I saw a few anode kits on Amazon with the 3/8 bolt for under $20.

Stay away from the cheap chit on Amazon …

 

[1985 Century Mustang]

Stay away from the cheap chit on Amazon …

Thanks, I just ordered from a company called www.boatzincs.com. $34 with shipping. I got the full kit for my outdrive. Not too shabby. The company is here in the US.

 

[1985 Century Mustang]

Hi, Does anybody know the correct part # for the lower vertical oil seal, this seal is located in the water pocket area, Mercruiser Alpha one Gen One.

FWIW, It's the smaller oil seal.

 

[1985 Century Mustang]

I found it. The lower vertical shaft oil seal.