Exhaust Rattle

Chewbacca

Chewbacca

Junior Member
Now that I finally have my 1930 CC Pickup running well, I am cleaning up a few cosmetic issues and chasing down rattles. One of my major noise generators is my exhaust pipe. Although the engine is on new motor mounts and runs smoothly, the pipe rattles just behind the passenger seat. There is lots of slack - I can slide a pencil between the pipe and the clamp. The clamp, which seems original, complete with cotter pin and castle nut, is snugged up at tight as it will go. My question is: Can I put on a smaller, tighter clamp or put a homemade sleeve between the pipe and existing clamp to act as a spacer and allow snugging it up? Does the expansion / contraction require the sliding of the pipe back and forth in this clamp? Thanks.
 
The clamp was not meant to be tight on the pipe. It's a slip fit on the tail pipe to allow expansion. You might try the suggestion as posted above or see if you can use one of the exhaust pipe hangers with the rubber section.
 
I know some of the repro mufflers have pipes smaller than original. My Aries muffler and original clamp fit well together.
 
I have the same problem with the origional clamp on my nice driver. Is my next step to adapt a modern type hanger?
Specific suggestions welcomed.
 
Why not just take the old hanger and crimp it with apair of channel locks til it fits a little tighter?
 
I have crimped some. Perhaps should be more aggressive. Was concerned about eliminating all movement in order to absorb engine vibration and movement but maybe the distance from the engine midigates this issue.
 
I had the same rattle problem on my 30 CCPU. Tried the insulated clamp without success. Finally decided to try and make an insulated rubber hanger for the clamp. I got one of those universal hangers and just used the hook and rubber insulator bolted to my hanger. It uses the same mounting hole as the original clamp and holds the tailpipe at the correct height. NO MORE RATTLES!! Here are a couple of pictures:
 

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As stated, that bracket should be a bit loose.. So I just use a piece from a welding glove and barely snug the hanger.. Its been at least 20 years..
 
Wait, it is supposed to move? but... but.. i welded mine to the frame (don't ask why) Should i change it? Mine also rattles like crazy but i figured it was because i did something wrong.
 
AL in NY said:
I had the same rattle problem on my 30 CCPU. Tried the insulated clamp without success. Finally decided to try and make an insulated rubber hanger for the clamp. I got one of those universal hangers and just used the hook and rubber insulator bolted to my hanger. It uses the same mounting hole as the original clamp and holds the tailpipe at the correct height. NO MORE RATTLES!! Here are a couple of pictures:
Click to expand...

This looks like it's worth trying!
 
I solved the same rattle on one of my cars by wrapping the pipe with masking tape (only one layer), then filling the gap with silicone. When the pipe got hot, the masking tape let go but the silicone withstood the heat. The result was a nice silent support that the pipe could slide through as it heated and cooled. Plastic food wrap instead of the masking tape would also do the trick.
 
I did do this, generic exhaust pipe hanger from O'Reilly's. Bent it up and over just like the picture, Some of the best Model A money I've spent! $3.50 works great.
 
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