heat riser
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Junior User
Joined: Sep 2004
Posts: 75
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From: oak harbor wa.
heat riser
i will be redoing my exhaust system. I'm keeping it basically stock but i want to remove the heat riser valve. it is nosy and probably not working correctly anyway. i don't mind a longer warm up time, but is there any reason why i should not do this?
Postmaster
Joined: Apr 2002
Posts: 3,613
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From: Coal country
No, you really do not need it there in Oak Harbor.
However, comma.
The exhaust manifold for the heat riser is machined flat to mate to the flat surface of the valve. But, the bottom of the riser is cast with a concave surface to mate to the doughnut or gasket between the manifold and the exhaust pipe.
If you remove the riser valve, you will need to replace the exhaust manifold with a non-riser type, and you will need to extend the existing exhaust pipe closer to the manifold - about 3 inches.
Unless you are replacing the exhaust system, it may be easier to leave the valve body in place, but weld the butterfly in the open position. That will keep it from rattling.
Hope this helps, and good luck!
However, comma.
The exhaust manifold for the heat riser is machined flat to mate to the flat surface of the valve. But, the bottom of the riser is cast with a concave surface to mate to the doughnut or gasket between the manifold and the exhaust pipe.
If you remove the riser valve, you will need to replace the exhaust manifold with a non-riser type, and you will need to extend the existing exhaust pipe closer to the manifold - about 3 inches.
Unless you are replacing the exhaust system, it may be easier to leave the valve body in place, but weld the butterfly in the open position. That will keep it from rattling.
Hope this helps, and good luck!
tap the shaf holes for pipe plugs.. she done..
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Junior User
Joined: Sep 2004
Posts: 75
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From: oak harbor wa.
thanks for the reply guys. so would i be able to use a drift and punch the shaft out then tap and plug? i would be replacing the pipe.
http://i6.photobucket.com/albums/y25...1/manifold.jpg
http://i6.photobucket.com/albums/y25...1/manifold.jpg
Last edited by jowilker; Dec 13, 2006 at 05:01 AM.
Logistics Pro
Joined: Oct 2005
Posts: 3,785
Likes: 4
From: Mddl A MexCans
Thas is a little different than mine but same thing. Mine is a simple football shaped cylinder no angle to it and it's only about 3" thick. Similar to this
http://www.americanpartsdepot.com/im...10%206712B.JPG
Kinda of hard to say without seeing it on a bench but looks dooable..worst case a long chisel to the butterfly edges of the shaft and then a drift on the left overs I'd say it's a dooable thing..yeah..
You are going to drop it firts right ? No banging on it bolted up like that ?
http://www.americanpartsdepot.com/im...10%206712B.JPG
Kinda of hard to say without seeing it on a bench but looks dooable..worst case a long chisel to the butterfly edges of the shaft and then a drift on the left overs I'd say it's a dooable thing..yeah..
You are going to drop it firts right ? No banging on it bolted up like that ?
Last edited by Redmanbob; Dec 12, 2006 at 09:25 PM.
