Gasket or O-ring ?

[starsnstripers]

1970 165hp 250cid L6 Mercruiser I removed the exhaust tub from the transom plate and my newer book 1975 says it takes an o-ring. There is no O-ring there or any sighn of a gasket/sealer. it looks like a machined surface with just some spots of paint. Does this take a gasket or a sealer? The parts look up on line says O-ring too hmmm?

 

[Haut Medoc]

Re: Gasket or O-ring ?

Yup, an o ring.....​

 

[starsnstripers]

Re: Gasket or O-ring ?

Ther wasn't one there and there's no groove for an o-ring. How would you keep an O-ring lined up there?

 

[ziggy]

Re: Gasket or O-ring ?

i ain't had my exhust tube off. so no expereince. service manual #1 says the same though. under exhaust elbow and shutter replacment, merc. 120-888. item 5. "place 'o' ring in groove of gimbal housing." 6. '' reinstall elbow with screws and lockwashers, torquing them to 20-25 ft. lbs. be certain that 'o' ring rmains seated in groove, properly sealing joint to prevent leakage."

got any pics?

 

[Haut Medoc]

Re: Gasket or O-ring ?

Bellows adhesive.....
It is not a metal to metal joint....​

 

[Haut Medoc]

Re: Gasket or O-ring ?

I wanna say that the older ones do not have that groove to receive the o ring, but you need it.......​

 

[starsnstripers]

Re: Gasket or O-ring ?

I scraped the surface and there is no groove. Also that hole is oval shaped so i dont know how the oring will stay i guess i'll have to adhere it ti the housing first and then install the tube. Could i just use adhesive? Or make a gasket? There was no O-ring when i took it apart?

 

[Fishermark]

Re: Gasket or O-ring ?

Here's a pic of what it is supposed to look like from the manual - is it possible the inside "wall" of the groove is gone due to corrosion?

 

[Fishermark]

Re: Gasket or O-ring ?

I have also heard of people filling the groove in with Marine Tex or other epoxy due to corrosion and pitting, then using a gasket. Perhaps that's what was done to yours?

 

[Haut Medoc]

Re: Gasket or O-ring ?

The o ring is in the gimbal housing, not on the y pipe.....
Look real close, I'll wager the groove is there, just like Mark's pic shows.....​

 

[starsnstripers]

Re: Gasket or O-ring ?

Well, I see the pic it's like my book 1975 my boat is 1970, There is no corrosion, O-ring or groove. I scraped it with the flat of a screwdriver and it is solid alum. Will automtive gasket with sealer work ok?

 

[Haut Medoc]

Re: Gasket or O-ring ?

I'd hate to give you a bum steer....
I'd wait to see what don S suggests......
One thing is certain: If that joint leaks, you will take on water from outside the boat....​

 

[starsnstripers]

Re: Gasket or O-ring ?

NO NO I dont need Don right now he'd chew me out haha! My bad :redface: Sorry, I got a better light and put on my glasses and "Wahlaa" It was there. It was really hard and molded right in there like it was a part of the surface. Was a bear to get out. Thanks Haut/Ziggy good info, thankyou!

 

[Don S]

Re: Gasket or O-ring ?

NO NO I dont need Don right now he'd chew me out haha!

I probably would have, but, you seem to be to blind to read it

 

[starsnstripers]

Re: Gasket or O-ring ?

HA HA ! Don I need one of those rolling eye's like your avitar. You dont miss a trick. Geesh, I thought this thread might sneak by ya!

 

[Don S]

Re: Gasket or O-ring ?

 

[starsnstripers]

Re: Gasket or O-ring ?

Ok Mr. Wizzard I'm gonna let this thread fade into "previous thread" land before the whole boating comunity see's It and My reputation as half a mariner turns into a wanna be mariner. I have been on the water for quite sometime i twisted wrenches for 15yrs heavy equip and large vessels tugs barges a couple small ships and some others eg. "larc"s Do you know what a LARC is Don? So yeah i'm half a mariner i guess just been out of it for a bit.

 

[Haut Medoc]

Re: Gasket or O-ring ?

*bump*.......:d​

 

[Don S]

Re: Gasket or O-ring ?

LARC = Boats with wheels = Lighter Amphibious Resupply Cargo

 

[starsnstripers]

Re: Gasket or O-ring ?

You looked it up!