exhaust clamps


exhaust clamps

Postby rider3 » Tue Apr 12, 2011 5:34 pm

I'm in the process of getting a 79 cbx barn find running and tried to fit the exhaust pipes today ( they were not on the bike when I got it ). It seems the clamps bottom out on the head before the pipe tightens up on the copper o-ring ( new ones that came with the bike ) leaving about a quarter inch between the end of the pipe flange and the o-ring. The spit rings seat fully in the clamp and the pipe flange seats against the spit rings. Is there a additional part I'm missing or is something mismatched. I tried to attach pics but file was to large.
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Re: exhaust clamps

Postby steve murdoch icoa #5322 » Tue Apr 12, 2011 8:22 pm

Hard to tell from the description but are the split collars in the right direction?
Is it stock pipes you are installing?
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Re: exhaust clamps

Postby daves79x » Tue Apr 12, 2011 9:35 pm

You were exactly right Steve, the split collars were backwards. Tom sent me a picture and that's the problem. All's well now. Thanks

Dave
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Re: exhaust clamps

Postby bigbob81 » Sat Dec 13, 2014 3:08 pm

Hey guys!
Refitting the exhaust on my 81. Anyone of you wizards out there
know the torque for the 10mm flanged nuts on the exhaust flanges?
I have fitted new gaskets from Louis (thanks again!) and am ready to seat
them home. Once torqued properly should they be rechecked after a
trial run/warmup? Thanks in advance for your guidance.
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Re: exhaust clamps

Postby EMS » Sat Dec 13, 2014 3:16 pm

8-12 Nm or 6-9 ft-lb.
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Re: exhaust clamps

Postby bigbob81 » Sat Dec 13, 2014 4:42 pm

Thank you, oh great wizard!!
It's really cool to have this knowledge out there.
I just hope I can share something that may help someone else.
Have a great weekend! I'll go finish up a listen to her purr
after I have thoroughly massaged the finger prints off of
her pipes.
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Re: exhaust clamps

Postby steve murdoch icoa #5322 » Sat Dec 13, 2014 4:49 pm

EMS has been called a lot of things but i am pretty sure "wizard" is a new one. haha.
Bob, i would definitely recheck them after a ride. If they are the copper gaskets the heat will make them more pliable.
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Re: exhaust clamps

Postby daves79x » Sat Dec 13, 2014 6:18 pm

Probably the first guy I've heard of actually torqueing exhaust flanges. Just snug them up, making sure the split collars are seated properly, then check after a ride or two (when cold).

Dave
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Re: exhaust clamps

Postby EMS » Sat Dec 13, 2014 8:27 pm

daves79x wrote:Probably the first guy I've heard of actually torqueing exhaust flanges. Just snug them up, making sure the split collars are seated properly, then check after a ride or two (when cold).

Dave


Not everybody is a gifted, naturally talented mechanic.!
The problem with the exhaust flange nuts is, that you can easily overtorque them. The threads on the studs are usually rusted and full of grime that is not that easy to spot.
You lose all feel for what you are actually doing when the nuts go on hard to begin with.
You will be on the safe side using a torque wrench, preventing pulling the studs out of the head!
I have two heads in my parts pile, with some of the studs are pulled out of the aluminum
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Re: exhaust clamps

Postby daves79x » Sun Dec 14, 2014 1:21 pm

I know, that was a bit harsh. But here's my take on torque values for the exhaust flanges - you are tightening a nut against a flange, which is trying to center and squeeze 2 split collars, which is all trying to compress a fiber or copper gasket, or an already partially compressed one - to a torque value of - what? I just don't think it's very meaningful and one has to, at some point, have a 'feel' for these things.

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