Re: 54 Clipper heat riser

Posted by Owen_Dyneto On 2012/7/25 10:20:02

The coiled bimetallic spiral spring works against the counterweight such that as the spring relaxes from heat, the counterweight overcomes the spring force and drops down and opens the valve. As the engine cools, the spiral spring will gradually overcome the force of the counterweight and close the valve.

So, unless someone has monkeyed with it, the valve is open when the counterweight is in the down position. A functioning valve is nice for a few minutes after a cold start-up if you experience colder weather, but many folks have just left the valve permanently open (weight down).