National Aeronca Association Bulletin Board

I ordered some exhaust gaskets from AS&S and I got these thin sheetmetal one with a groove . They were called SOLID FLANGE 632837 . The ones I removed were thick beefy ones . I like the looks of the thick ones better. I am putting new exhaust on and need to get some good gaskets. What do you prefer to use on the 65 motors? Thanks Mike

The thin ones were supplied by Gibson when they recently overhauled my A65 cylinders. We used them. Only 13 hrs but ok so far. I assume Gibson knows their stuff. But we'll see.

I guess I can use them, but they look so rinky dink. I guess they may be better than they look.

I found that exh gasket descriptions in my catalogs are very confusing, especially in WagAero.

I call these you have "crush gaskets" and are by far the best ones I've used.

I tried all the others which are far more expensive and none of them work unless the two surfaces are absolutely perfect.

These SS crush gaskets conform to all the imperfections and really did the job for me on three different brand engines where others eventually failed. I think the fact that they are SS has a lot to do with it.

Be sure to note that there is a specific direction for the gaskets to be installed (I forget which now) and that they are to be installed in pairs. In other words, two gaskets for each exhaust outlet.

Also, if you remove any be sure to reinstall them in as you removed them. They may hold when reused and may not but they are so cheap relatively that I usually just use new ones.

Well I need to order four more if I am reading correctly,two gaskets on each cylinder. Is that correct?

Correct, use 2 per stack and join them like this....



nkh

Ok now that is cleared up what are the torque specs on the intake and exhaust bolts. I looked at the continental site and couldnt find it. Mike

Nathan,

That isn't the way I use them, my understanding is that they are to be "spooned" together and the way I have used them for years. As I remember I checked with the mfg on a website before using them. It was a long time ago so I'm not sure.

It would be funny if I have used them the wrong way all these years and never had a leak!!

100 in/lbs on intake and 80in/lbs on the exhaust. Or about wrist tight (as far as you can tighten by turning the wrist only.) Be sure to re-tourqe the exhaust after about 10 hours, they a will all loosen after a couple heat/cool cycles.

Gus, that's the way I was shown and how we do it in the shop with no problems. Anybody else got an answer?

nkh

Well I'm with Gus on this one. I believe spooned together is the way to go. Although Nate's idea seems more logical, I remember being told one inside the other. I have the installation instructions out in the shop, I will go check it out and get back to you all.

I went to the Rapco site and it states in the installation tips-
Install solid gaskets with raised bead facing the the exhaust flange- These may be used in pairs with raised beads interlocked if desired.

Hi, I don't mean to make this anymore complicated, but I pulled a couple of cylinders. What do you mean by the exhaust flange? Does the raised side of the gasket go towards the cylinder head or the exhaust pipe? I couldn't follow directions in school either...haha

Big Chief.....I'm assuming (since they say flange) that the raised part goes toward the pipe 'flange'. Having said that, I doubt if it makes much difference as along as it seals. I have three on each exhaust outlet if I remember correctly as some 'dope' ran it with a leaking gasket and burned the cylinder head exhaust outlet. My IA said to install as many as you need to do the job as they will conform and fill in the space if even on a temporary basis. I think mine have been on for at least three years and seem to be holding. I watch them pretty close though.

Mike B.

BC,

I agree with Mike, there is no flange on the cyl head but there is certainly one on the exh pipe.

Using three on poor surfaces is something I had never thought of. Since they are so cheap there is nothing to lose by trying it.

Check out this link for torque specs for Cont engines:

http://www.tcmlink.com/pdf2/SB96-7C.pdf