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Discussion Starter #1
Hi guys, I have a question, in the workshop manual it shows that the rear silencer is assembled with a gasket, however, in the alfa-service they show a sealing ring (looks like a better option?). which one do you recommend, the triangular gasket or the metallic sealing ring (13)?

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My vote is the sealing ring, don’t recall ever seeing the metal gasket. The ring allows you to tweak the rear section for a better fit. Just my 2cents.
 

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Agree with previous posters: all the exhaust systems I've installed used the sealing ring, which allows you to adjust the angle between those two parts (they're not made with 100% precision).

But the diagram on the right of post #1 has me puzzled - did any Alfas come from the factory, or were any aftermarket exhaust systems made to take just a flat gasket? If you had pipes with just flat flanges, instead of a recess to accept the sealing ring, then you'd pretty much have to use a gasket.

So Villalgi: what do the ends of your pipes look like?
 
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Discussion Starter #6
Agree with previous posters: all the exhaust systems I've installed used the sealing ring, which allows you to adjust the angle between those two parts (they're not made with 100% precision).

But the diagram on the right of post #1 has me puzzled - did any Alfas come from the factory, or were any aftermarket exhaust systems made to take just a flat gasket? If you had pipes with just flat flanges, instead of a recess to accept the sealing ring, then you'd pretty much have to use a gasket.

So Villalgi: what do the ends of your pipes look like?
Hi Jay, I took out the end exhaust, and I believe it’s the original (date 1988 in the silencer), and it had a broken triangular flat gasket. I am going to assemble it back with the sealing ring I got from the alfa parts store, with some anti-seize paste around. I assume that the original design came with the flat triangular gasket, but over time it was replaced with the sealing ring to allow better fit of the two parts.
 

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Hi Jay, I took out the end exhaust, and I believe it’s the original (date 1988 in the silencer), and it had a broken triangular flat gasket. I am going to assemble it back with the sealing ring I got from the alfa parts store, with some anti-seize paste around. I assume that the original design came with the flat triangular gasket, but over time it was replaced with the sealing ring to allow better fit of the two parts.
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it had a broken triangular flat gasket. ...... I assume that the original design came with the flat triangular gasket, but over time it was replaced with the sealing ring to allow better fit of the two parts.
No, I don't think that's correct. My '66 Sprint GT uses a sealing ring. Perhaps the early cars used the ring, as mufflers were more hand-made in the 60's. But by the 80's/90's the quality of flange alignment was greater, allowing cheaper flat gaskets to be used. Honestly, I'm just guessing here.

I see that the new pipe/muffler you have has a flat flange. What does the mating part look like? Does it have a recess for the sealing ring to nest into? I'm not sure how well the sealing ring will work if both flanges are flat.
 

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definitely that fat donut ring is best!

when you put the rear exhaust back, just leave those 3 bolts quite loose, then align the rear tail piece so that it exits the opening in the rear body nice and centred, then slowly tighten those 3 bolts bit by bit...you will end up with a very nice centred tailpipe:)

(last time I did this, I was on my back on the garage floor and held the tailpipe with one foot whilst tightening the 3 bolts!.....better would be a little helper!)
 

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Discussion Starter #10
definitely that fat donut ring is best!

when you put the rear exhaust back, just leave those 3 bolts quite loose, then align the rear tail piece so that it exits the opening in the rear body nice and centred, then slowly tighten those 3 bolts bit by bit...you will end up with a very nice centred tailpipe:)

(last time I did this, I was on my back on the garage floor and held the tailpipe with one foot whilst tightening the 3 bolts!.....better would be a little helper!)
Thanks For the advice! I will follow your instructions, and I will get my 17yr old son to come help me... if he wants to drive the spider to pick up a girl someday! 😉
 

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No, I don't think that's correct. My '66 Sprint GT uses a sealing ring. Perhaps the early cars used the ring, as mufflers were more hand-made in the 60's. But by the 80's/90's the quality of flange alignment was greater, allowing cheaper flat gaskets to be used. Honestly, I'm just guessing here.

I see that the new pipe/muffler you have has a flat flange. What does the mating part look like? Does it have a recess for the sealing ring to nest into? I'm not sure how well the sealing ring will work if both flanges are flat.
Well, the new one looks almost exactly like the old one, so not completely flat, the ring fits really nice in there in both parts, so it looks like the best solution as others said. I will try to put it together with a bit of help tomorrow, and see if all fits fine. Otherwise, I will get a flat gasket.
 
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