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Heat valve in manifold
#1403903 Tue Mar 30 2021 10:58 PM
Joined: Mar 2021
Posts: 5
Kel1025 Offline OP
1953 gmc pickup 228 engine:
My heat valve seems to be loose on the inside of the manifold (it flutters around easily) and the outside (weight?) barely moves when I tap on it with a hammer. There seems to be lots of advice on how to free up the valve with lube or kerosene, but is there a way to tighten the valve to the rod on the inside so its movement is the same as the valve when it turns instead of the tongue piece fluttering around freely? Thanks!

Re: Heat valve in manifold
Kel1025 #1404439 Fri Apr 02 2021 05:25 PM
Joined: Feb 2004
Posts: 23,008
You would need to remove the manifold and either install machine screws to hold the flap valve to the shaft and peen the ends of the screws to keep them from backing out, or tack-weld the flap to the shaft. Be sure to position the flap properly before securing it to the shaft- - - -it's going to be a one-time opportunity to get it right. I've fabricated flap valves and shafts from stainless steel for a long-term fix.

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Re: Heat valve in manifold
Hotrod Lincoln #1415226 Mon Jun 28 2021 08:19 PM
Joined: Mar 2021
Posts: 5
Kel1025 Offline OP
Thank you, this is helpful!

Re: Heat valve in manifold
Kel1025 #1415230 Mon Jun 28 2021 10:12 PM
Joined: Sep 2010
Posts: 981
If it is like my 235 the weight is threaded on the shaft as well as a pin . There are bushings we’re the shaft goes through the manifold and the flap inside the manifold is welded to the shaft.

kevinski 1954 GMC 9300 Welcome to the virtual Garage []
Re: Heat valve in manifold
Kel1025 #1415250 Tue Jun 29 2021 01:28 AM
Joined: Dec 2013
Posts: 1,013
I rebuilt this one on a 1949 GMC 228. It was stuck and with new bushings and a stainless steel shaft it worked as it should after being re-assembled. The photos will give you a good idea of what's going on inside the exhaust manifold.

Attached Files
Weight, Shaft, Spring and Bushings.jpg (329.45 KB, 96 downloads)
Reassembled - Weight.jpg (220.91 KB, 99 downloads)
Reassembled - Valve.jpg (279.79 KB, 94 downloads)
Reassembled - Spring.jpg (255.03 KB, 93 downloads)


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Hers: 2008 American Saddlebred []

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