Manifold Heat Valve - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Fred n' Ethel · 05-14-2018, 09:41 PM

54' - 235
Was frozen up, free now, spring in good shape.
How it works ? ? ?
When engine is cold, the spring holds the shaft in the CW direction when looking from the front of the engine. The counterweight is on top and a little to the right.
Bring the engine up to temp., and nothing changes.
The spring is preloaded about half a turn.
I understand this is to preheat the intake, then open up (actually close) to divert the exhaust away from the intake when the bi-metal spring gets hot.
Am I on the right track ?
Thanks for any help here.

05-14-2018, 09:41 PM	#1
Fred n' Ethel Registered User Join Date: Feb 2018 Location: Eastern WV Posts: 161	Manifold Heat Valve 54' - 235 Was frozen up, free now, spring in good shape. How it works ? ? ? When engine is cold, the spring holds the shaft in the CW direction when looking from the front of the engine. The counterweight is on top and a little to the right. Bring the engine up to temp., and nothing changes. The spring is preloaded about half a turn. I understand this is to preheat the intake, then open up (actually close) to divert the exhaust away from the intake when the bi-metal spring gets hot. Am I on the right track ? Thanks for any help here. Last edited by Fred n' Ethel; 05-14-2018 at 10:56 PM.



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