What is this??

sclockout · Feb 27, 2015

on a 84 1/2ton 318. what is this? between exhaust manifold and exhaust pipe keeps backfiring out the hole. how do i get it to stop?? the A.I.R. hose is above this..

RonJon '06 · Feb 27, 2015

That looks like the heat riser. Inside there is a butterfly valve attached to a bimetal spring. When the engine is cold the valve is closed and sends hot air up to the intake so the engine can warm up faster. There should be a counter weight on the outside and I would make sure that it moves freely. If its not opening up then maybe that's what is causing your backfiring? Welcome to RF.

crazzywolfie · Feb 27, 2015

i don't know if that is the heat riser or valve. there is an extra piece in there that i have no clue what it is. the valve should be in the manifold

sclockout · Feb 27, 2015

im not sure thats the heat riser wouldn't that be the metal pipe right above that?? the little pin thing in the middle moves around. im lost cant find it on any part lists. it was a tow truck could someone have added something?? cant unbolt it so cutting is the only way to get it out. what if i weld it closed???? :suicide:

crazzywolfie · Feb 27, 2015

that metal pipe above it looks like emissions relate but i have never seen it tied in like that. usually emissions stuff ties into the end of exhaust manifold.

NYCruiser · Feb 27, 2015

Almost looks like someone had connected a turbo to it. Is the hole threaded? Maybe can just cap it.

A quick glance in google images shows me that AMC had manifolds for the 360's they used in that era that had a separate heat exchange valve like that. Could someone have bolted some AMC stuff on that truck?

sclockout · Feb 27, 2015

i cant tell if there are threads its ruff inside could have been threaded
at one time..

sclockout · Feb 28, 2015

NYCruiser said:
Almost looks like someone had connected a turbo to it. Is the hole threaded? Maybe can just cap it.

A quick glance in google images shows me that AMC had manifolds for the 360's they used in that era that had a separate heat exchange valve like that. Could someone have bolted some AMC stuff on that truck?

Coul you link to that?

RonJon '06 · Feb 28, 2015

It might not be original or even Chrysler but it looks like a heat riser valve to me. I think NYCruiser is right, maybe someone put a different exhaust setup on your truck. I worked on a '75 Jeep a few years ago and that is where the heat riser valve is located. Here's a pic of one from a 1984 Ford Bronco.

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The one on the older Jeep looked different, it had a spring and counterweight on the outside and no vacuum fitting. Maybe someone left that piece in order to get everything to fit but removed the outer parts to make sure it stayed open all the time?

[URL=http://s582.photobucket.com/user/amc4evr/media/Matador%20X%20Coupe/1974%20AMC%20Matador%20X%20Coupe/exhaust_thing_zpsc92ae409.jpg.html]

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NYCruiser · Feb 28, 2015

^^That's what I'm thinking too.

sclockout · Feb 28, 2015

Thanks for all the info guys :favorites13:

What is this??

sclockout

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