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Unread 02-10-2013, 02:28 PM   #1
Little Green
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1991 FSJ Wagoneer 
 
Join Date: Nov 2007
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Help with exhaust y pipe piece

So I am in the process of replacing the y pipe for the exhaust. Of course 3 of the 4 bolts break off but I am trying to figure out what the Attached piece is. It looks like it has a butterfly in it but the spring is shot and it clearly does not work. Any ideas? Is it needed?

image-586627858.jpg


Thanks

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Unread 02-10-2013, 05:30 PM   #2
RockRollin
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I removed the butterfly and welded the holes. Its for warmup, butterfly closed when cold causing back pressure.
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Unread 02-10-2013, 06:48 PM   #3
Little Green
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Welded which holes? Thanks

Caesar
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Unread 02-10-2013, 07:21 PM   #4
RockRollin
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The butterfly shaft holes. You could tap the holes a thread a bolt if no welder available, but welding would be best option.
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"I like fun" Edd
Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 02-10-2013, 09:06 PM   #5
BJ's Off-Road
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It is an exhaust damper. When cold, it is closed and it forces that sides exhaust through the intake manifold and out the other side of the exhaust. A lot of people just weld them open.
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Unread 02-10-2013, 11:19 PM   #6
pleontks
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ties into that little metal tube that goes into the bottom of your air cleaner.

My was cracked in half. I removed it. Not a good idea. I twisted my y-pipe and the whole exhaust. Was a horrible pain to get donut to seal.

Definetly suggest putting it back in. With or without butterfly.
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