Re: V8 manifold/exhaust valve seems to stick

Posted by Redhexagon On 2022/12/11 23:42:12

It's a typical manifold heat valve. As said, it's sandwiched between the exhaust manifold and the pipe at the flange on the driver's side.

The weight on the crank arm pulls the valve open by gravity when the valve heats up enough for the bi-metallic spring to loose tension. The spring pulls the valve shut when it's cold. It needs to move freely.

NEVER USE OIL! It will carbonize on the shaft and stick the valve. Use graphite lock lubricant, which is nothing more than powdered graphite suspended in solvent. Spray the shaft and work the valve back and forth. This is normal maintenance every few thousand miles.