manifold heat valve

Doug Wi · Aug 11, 2020

Manifold on my 666 is cracked and have to replace it. Just can't seem to wrap my head around how that heat valve works. the old one on the tractor and the new one are hooked up differently. I know that when the valve is open it allows hot exhaust to circulate against the intake to warm the intake while the engine is cold. Is the valve supposed to be spring loaded open and then as is warms the spring closes it and the weight helps it close? The weight on the new manifold wasn't secured to the shaft, so that's part of my confusion. I feel so stupid when something so simple baffles me . Thanks for any help.

Bob M · Aug 12, 2020

I'm not familiar with your particular manifold arrangement. However on the Chrysler engines I owned a cold spring holds the heat flapper closed. The counterweight aids holding the flapper closed.

When hot the spring unwinds and exhaust pressure moves the flapper open and the counterweight vertical so the flapper remains open.

I suspect yours operates similarly.

manifold heat valve

Doug Wi

Member

Bob M

Well-known Member

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