identify this on intake manifold 1937 D7 4 Door

[mrtechnologist2u]

There is a spring mounted lever below the carburator on the intake manifold.  What does it do?

When the engine is cold should it be set up so there is tension holding it up or loose letting it fall down

Edited June 7, 2020 by mrtechnologist2u
identified year and model of car (see edit history)

[hwellens]

I assume you are talking about the spring that operates the heat riser in the exhaust manifold. It helps get the engine warmed up faster and then the bi-metal spring heats up and opens the heat riser.  It heat riser is stuck i the closed position, your engine will probably run hot.

[mrtechnologist2u]

(Face smack!)  Of course.  It has been an overwhelming couple of days!  Thank you.

[jpage]

Looks like you may be missing the tension spring that regulates it's operation.

[Brooklyn Beer]

On my 39 Chrysler it was explained to me as it heats up, the little weight on the end of the arm helps to close it. I have no spring and have mine wired closed being it is summer. Yours looks stuck open.

[jpage]

It's actually closed when the weight is up. The heat relieves the tension in the spring allowing the counterweight to fall and open the shutter. This helps to warm the fuel in cold weather for better atomization of the fuel.These things usually corrode tight but can be carefully loosened up.It's usually an easy fix and can really help when starting.