Question for a "friend

[larry nelson]

Really, I would never ask a question like this . My "friend" has a 77 E-II (much like mine). He sensed that he had an exhaust leak near the engine
so reached into area where his exhaust pipe is connected to the cast iron manifold and he could feel the leak (the engine was running, so he says). So
I, I mean my friend looked in at the Applied website and found muffler bearings that seemed to be what he might need. Too embarrassed to ask about
"muffler bearings" himself, he asked me to ask about them. They are not priced on the Applied website so my friend is thinking they are just a
continuation of the muffler bearing urban myth scenario. Maybe a bit of whimsy from Jim K or Nick? Anyway, my friend needs to cinch up that joint. He
thanks you for any info you can share. I have to leave now. Snipe hunting season opens today.
--
Larry Nelson Springfield, MO
Ex GMC'er, then GM Busnut
now '77 Eleganza ARS WB0JOT

 

[dave stragand1]

They are also known as an exhaust donut or exhaust flange gasket and yes, they are real.

-Dave
1978 Transmode near Pittsburgh

>
> Really, I would never ask a question like this . My "friend" has a 77 E-II (much like mine). He sensed that he had an exhaust leak near the engine
> so reached into area where his exhaust pipe is connected to the cast iron manifold and he could feel the leak (the engine was running, so he says). So
> I, I mean my friend looked in at the Applied website and found muffler bearings that seemed to be what he might need. Too embarrassed to ask about
> "muffler bearings" himself, he asked me to ask about them. They are not priced on the Applied website so my friend is thinking they are just a
> continuation of the muffler bearing urban myth scenario. Maybe a bit of whimsy from Jim K or Nick? Anyway, my friend needs to cinch up that joint. He
> thanks you for any info you can share. I have to leave now. Snipe hunting season opens today.
> --
> Larry Nelson Springfield, MO
> Ex GMC'er, then GM Busnut
> now '77 Eleganza ARS WB0JOT
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:

 

[Ken H.]

One of these should work -- be sure to measure and order the correct ID:

1976 OLDSMOBILE TORONADO 7.5L 455cid V8 Pipe Flange Gasket / Seal | RockAuto
https://www.rockauto.com/en/catalog/oldsmobile,1976,toronado,7.5l+455cid+v8,1225741,exhaust+&+emission,pipe+flange+gasket+/+seal,5836

Ken H.

On Wed, Mar 17, 2021 at 8:20 AM Dave Stragand
wrote:

> They are also known as an exhaust donut or exhaust flange gasket and yes,
> they are real.
>
> -Dave
> 1978 Transmode near Pittsburgh
>
> > On Mar 17, 2021, at 8:08 AM, Larry Nelson <

> >
> > Really, I would never ask a question like this . My "friend" has a
> 77 E-II (much like mine). He sensed that he had an exhaust leak near the
> engine
> > so reached into area where his exhaust pipe is connected to the cast
> iron manifold and he could feel the leak (the engine was running, so he
> says). So
> > I, I mean my friend looked in at the Applied website and found muffler
> bearings that seemed to be what he might need. Too embarrassed to ask about
> > "muffler bearings" himself, he asked me to ask about them. They are not
> priced on the Applied website so my friend is thinking they are just a
> > continuation of the muffler bearing urban myth scenario. Maybe a bit of
> whimsy from Jim K or Nick? Anyway, my friend needs to cinch up that joint.
> He
> > thanks you for any info you can share. I have to leave now. Snipe
> hunting season opens today.
> > --
> > Larry Nelson Springfield, MO
> > Ex GMC'er, then GM Busnut
> > now '77 Eleganza ARS WB0JOT
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

 

[john r. lebetski]

Muffler bearing is a slang term (usually regarding a shop charging an unsuspecting customer for a mythical part) However on the GMC they have taken
on the meaning of the silicone rubber isolators that the long 2 1/2” pipes pass through to keep them from rubbing the frame. The rubber grommet is
GM 712307 and the bracket is GM 712306. 2 sets are used along the pipe.
The part you need is the SEAL- manifold or GM 387897. These are 2 1/4” and available from Felpro (Federal Mogul) or Nickson exhaust parts. I have
had longer lasting results with the Nickson. The Felpro have a blue coating and the Nickson are a natural graphite finish on the sealing ring.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[john r. lebetski]

Note that when installing the 2 1/4” seals between the manifold and exhaust pipe that this joint flexes under spring tension. You must play with
the pipe to get it parallel to the manifold exit. You may have to rotate it where it enters the muffler inlet. If not parallel, the seals may start to
leak in a short time.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[Matt Colie]

Larry,

Please tell your "friend" that he is very welcome to come here and ask questions or advice even on questions that may seem stupid or even obvious.
The only stupid question is the one that you don't know enough to know you really should ask it.

Oh, if I started a thread here like "Stupid GMC Tricks", I bet it would go on for pages and days with only half the forum members responding. That
only would be that short because the half that didn't respond were too embarrased to admit what he had done and how long it took him to figure out
what mistake he had made....

Matt - who could start this thread now
--
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

 

[larry nelson]

Thanks to all. So the muffler bearing that Jim K has on his site is NOT what I am looking for? It looks similar to various exploded views of the
Toronodo exhaust system. He also has those spring bolts. I am away from my coach until Sunday so I thought I would get things lined out.
--
Larry Nelson Springfield, MO
Ex GMC'er, then GM Busnut
now '77 Eleganza ARS WB0JOT

 

[Randy Van Winkle]

> Really, I would never ask a question like this . My "friend" has a 77 E-II (much like mine). He sensed that he had an exhaust leak near the
> engine so reached into area where his exhaust pipe is connected to the cast iron manifold and he could feel the leak (the engine was running, so he
> says). So I, I mean my friend looked in at the Applied website and found muffler bearings that seemed to be what he might need. Too embarrassed to
> ask about "muffler bearings" himself, he asked me to ask about them. They are not priced on the Applied website so my friend is thinking they are
> just a continuation of the muffler bearing urban myth scenario. Maybe a bit of whimsy from Jim K or Nick? Anyway, my friend needs to cinch up that
> joint. He thanks you for any info you can share. I have to leave now. Snipe hunting season opens today.

Larry,

Yeah, the muffler bearing goes in right next to the doohickey. Seriously, there is such a thing as a muffler bearing. Probably a little miss named as
exhaust bearing might be a bit more descriptive. In the GMC, we generally have a couple of types. One, which is the one you are having an issue with
is where the exhaust pipe connects to the manifold (sometimes called a donut). These are readily available at auto parts stores. Just take the old
one to make sure you match the size and configuration. On the tailpipe where it runs down the passenger side, there are muffler bearings that hold
the tailpipe where it passes through the cross members.

We are getting ready to leave for a week or two trip somewhere south but you would be welcome to bring your (or your friend's coach) over and put it
up on my lift - makes a job like this much easier.

--
Randy & Margie
'77 Eleganza II '403'
Battlefield, MO

 

[Matt Colie]

> Thanks to all. So the muffler bearing that Jim K has on his site is NOT what I am looking for? It looks similar to various exploded views of the
> Toronodo exhaust system. He also has those spring bolts. I am away from my coach until Sunday so I thought I would get things lined out.

Larry,

If you have the parts manual, there is a bad picture on page 12-8 in figure 12.030. There it is called a Seal, manifold, everybody else will call it
an exhaust donut. If you are not sure your bolts and springs are good, get them too.

If you dig far enough, it comes up as a Felpro 60241. I'm sure it will change if you have headers.

Matt
--
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

 

[larry nelson]

> > Really, I would never ask a question like this . My "friend" has a 77 E-II (much like mine). He sensed that he had an exhaust leak near
> > the engine so reached into area where his exhaust pipe is connected to the cast iron manifold and he could feel the leak (the engine was running,
> > so he says). So I, I mean my friend looked in at the Applied website and found muffler bearings that seemed to be what he might need. Too
> > embarrassed to ask about "muffler bearings" himself, he asked me to ask about them. They are not priced on the Applied website so my friend is
> > thinking they are just a continuation of the muffler bearing urban myth scenario. Maybe a bit of whimsy from Jim K or Nick? Anyway, my friend
> > needs to cinch up that joint. He thanks you for any info you can share. I have to leave now. Snipe hunting season opens today.
>
> Larry,
>
> Yeah, the muffler bearing goes in right next to the doohickey. Seriously, there is such a thing as a muffler bearing. Probably a little miss named
> as exhaust bearing might be a bit more descriptive. In the GMC, we generally have a couple of types. One, which is the one you are having an issue
> with is where the exhaust pipe connects to the manifold (sometimes called a donut). These are readily available at auto parts stores. Just take the
> old one to make sure you match the size and configuration. On the tailpipe where it runs down the passenger side, there are muffler bearings that
> hold the tailpipe where it passes through the cross members.
>
> We are getting ready to leave for a week or two trip somewhere south but you would be welcome to bring your (or your friend's coach) over and put
> it up on my lift - makes a job like this much easier

Randy thanks for the offer. Dellene and I are already “south” thanks to American Airlines. I am sitting at my daughters pool in West Palm Beach.
Heading for Springfield Sunday. Sunday afternoon I will be soaking my spring bolts with Kroil and I don’t think it should be too difficult to
replace those donuts. That means, of course, that it will be harder than I think. I am not checked out on your lift so maybe next time. I am anxious
to see it. I will at least see you at the Flatlanders Clinton Lake get together.

--
Larry Nelson Springfield, MO
Ex GMC'er, then GM Busnut
now '77 Eleganza ARS WB0JOT