Re: Manifold Heat Valve

Posted by HH56 On 2023/5/16 23:03:48
37 should be like other years and weight would be down. With engine cold the spring keeps the weight up and valve closed. As the spring warms it reduces tension and gravity pulls the weight down to open the valve.

If spring has been damaged or shortened so you cannot remove the center tang from the valve stem slot and wrap the spring another 1/2 turn and tighten it enough to hold the weight up, believe Max Merritt has new ones.

Here is a bit from a postwar manual which typically covers the adjustment on most of the inline engines. Details on how the spring mounts or direction it winds may vary but the operation and adjustment is about the same for all.

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