Still Having exhaust trouble

[danielnorton]

I ordered a new sealing ring #5 from moss

https://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=29307

so I'm still not sure what I'm doing wrong. I put the pipe through the clamp (not sure what else to call it) that connects to the mainfold. sat the sealing ring on the pipe, pushed it up agaist the mainfold and tightend the 3 bolts.
Started the car, the pipe popped out of the mainfold again.

I though maybe I tightend everything too much so I repeated the process, this time going just beyond hand tight (about 2 turns) the car started, ran for a few minutes, no problem. Then I went under to clean up my tools etc, bumped the pipe with may arm and it fell out again.

So I added the front strap to keep it in place, pushed the pipe back up and it has maybe 1/2 inch play, but seems to stay.

I'm heading out to drive around the block, hoping it will stay, but any advice just in case would be great..
How tight should I make the bolts?
should I tighten them once the engine warms up or cold?

thanks

Daniel

 

[ChrisS]

Can you get a pic of what you have? The pipe should be captured by the ring to the right of the #6 in that diagram. The pipe should not drop down unless the three nuts completely fall off.

 

[Bugeye58]

Daniel, the only time that I've seen that happen is if the collar under the sealing ring has rusted or collapsed to make it smaller than the inside diameter of the clamp. That is the ring that the flange presses on to seal the donut against the manifold.
Jeff

 

[danielnorton]

The ring is attached, the pipe falls through it.
Just drove for 10 minutes with no problems. turned off the engine, restarted and it popped off again.

 

[Bugeye58]

Daniel, are you saying that the flange with the three bolt holes in it is on the manifold side of the pipe?? It should slide on the pipe from the rear end, and be captured by the collar on the pipe. Make sure your pipe looks like #10 on the Moss illustration, and not like #9. If it looks like #9, you have the wrong pipe. If it's #10, you'll have to remove the pipe and slide the flange on from the back.
Hope I've made myself clear.
Jeff

 

[danielnorton]

right, the flange is on the mainfold side of the pipe. I was able to push the pipe through from the maifold end (I didn't have to take the pipe off.) and that seemed wierd to me.

hmmm, I'd say it looks more like 9, what's weird is that the PO drove the car for a couple of years and I took it out a couple of times before this and never had a problem.. I wonder what made it stay all that time and then suddenly fall...

So the question would be is it possible to just use #3 to hold it or do I need a new pipe.

 

[danielnorton]

here's a shot of my sister holding the parts in question.. not sure if that helps.

 

[Bugeye58]

Daniel, you have the wrong front pipe. That's the setup for the 1098 and very early 1275 cars that used the split clamp style manifold.
Jeff

 

[jlaird]

/bcforum/images/%%GRAEMLIN_URL%%/iagree.gif A new front pipe is in order, in fact it is considerly larger in diameter. Might want to check that the muffler is correct as well. The pipe you are useing will also restrict the engine breathing, you will find it will run just a bit better as well.

 

[danielnorton]

The pipe and muffler are a bit rustly and I was thinking of changing them eventually, but I guess that just jumped to the top of the list /bcforum/images/%%GRAEMLIN_URL%%/wink.gif

I just can't understand how it worked for so long .. weird..

thanks guys!

 

[bugimike]

Like everyone else said above, if you look at pipe #10 in the diagram above, you will see that the flange end is more complex than the other two set-ups which in effect make the flange (held by the retainer) larger in diameter and provides a "sleeve" for the gasket to slide over. The PO may have hammered out or flared the flange on the wrong pipe "to make it work" but that is really just whistling in the wind as the seal between manifold and pipe is doomed to failure as the gasket will burn up in no time without the "sleeve" it goes over on the newer pipe to "protect" it from direct heat!

 

[ChrisS]

Dan, I've got an exhaust pipe if you need one while you get it going. Let me know the next time you are up working on the car and we can connect.

 

[bugimike]

That pic Chris posted shows the correct pipe. See how it is "fatter" where it goes through the flange? /bcforum/images/%%GRAEMLIN_URL%%/thumbsup.gif
PS the pipes are fairly stout, so even if they look a bit rusty, generally they have plenty of life left in them!

 

[danielnorton]

Chris, PM Sent.