Weird Hingy-thingy after left exhaust manifold - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OSM 70 C20 · 09-30-2012, 01:32 PM

Took my front clip off this weekend to replace radiator core support bushings and while tinkering & cleaning I saw this thing. It seems like it is weighted and I can hear movement inside....
Name: exhaustgate.jpg
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Name: exhaustgate.jpg
Views: 204
Size: 30.0 KB

**FirstOwner69** · 09-30-2012, 01:50 PM

It's a heat riser that is closed when the engine is cold to route some exhaust through the intake under the carb to reduce the chance of carburetor icing in cold temps. It opens (or should) as the engine warms.

OSM 70 C20 · 09-30-2012, 01:57 PM

Ok, it seems a little loose or not any sort of tension on it. Hey thanks for the quick answer!

ETsC10 · 09-30-2012, 01:59 PM

Yup. Important in colder regions.
There should be a spring that looks kind of like a choke spring
that tensions the thing (right behind the counterweight).
New ones run about $50 and up I think.

They can rattle like the dickens too!

AirSpeed · 09-30-2012, 03:48 PM

I just put a new exhaust on mine and found the PO had cut the valve out of it, it gets well below freezing where I live and I've never had any problems with it not working. The one in my 69 was stuck closed, for how long I don't know but once I propped it open my truck sure ran better!
Posted via Mobile Device

09-30-2012, 01:32 PM	#1
OSM 70 C20 Registered User Join Date: Jun 2012 Location: Fargo, North Dakota Posts: 140	Weird Hingy-thingy after left exhaust manifold Took my front clip off this weekend to replace radiator core support bushings and while tinkering & cleaning I saw this thing. It seems like it is weighted and I can hear movement inside.... __________________ "I taste Rust" I wish I had the money my truck thinks I do I taste "Patina"

09-30-2012, 01:50 PM	#2
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,846	Re: Weird Hingy-thingy after left exhaust manifold It's a heat riser that is closed when the engine is cold to route some exhaust through the intake under the carb to reduce the chance of carburetor icing in cold temps. It opens (or should) as the engine warms.

09-30-2012, 01:57 PM	#3
OSM 70 C20 Registered User Join Date: Jun 2012 Location: Fargo, North Dakota Posts: 140	Re: Weird Hingy-thingy after left exhaust manifold Ok, it seems a little loose or not any sort of tension on it. Hey thanks for the quick answer! __________________ "I taste Rust" I wish I had the money my truck thinks I do I taste "Patina"

09-30-2012, 01:59 PM	#4
ETsC10 Hand Crafted C-10 Join Date: Aug 2006 Location: Burien, WA Posts: 5,180	Re: Weird Hingy-thingy after left exhaust manifold Yup. Important in colder regions. There should be a spring that looks kind of like a choke spring that tensions the thing (right behind the counterweight). New ones run about $50 and up I think. They can rattle like the dickens too!

09-30-2012, 03:48 PM	#5
AirSpeed Registered User Join Date: Jul 2007 Location: Fall River California Posts: 2,026	Re: Weird Hingy-thingy after left exhaust manifold I just put a new exhaust on mine and found the PO had cut the valve out of it, it gets well below freezing where I live and I've never had any problems with it not working. The one in my 69 was stuck closed, for how long I don't know but once I propped it open my truck sure ran better! Posted via Mobile Device __________________ http://smg.photobucket.com/albums/v655/aaronhero/



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