Re: Re: farmall c overheating part 2

Posted by ScottyNY on February 20, 2002 at 12:33:02 from (128.59.123.240):

In Reply to: Re: farmall c overheating part 2 posted by John in Maryland on February 20, 2002 at 10:42:34:

We're over-engineering a little here. A thermosiphon is as simple as it gets. Hot water will rise above cooler water. cool water will settle out below hot water. If you can get this to happen in a loop , you will get a flow. Water heats up as it takes heat from around the sleeves, and rises into the head. It picks up more heat from the head, rising further, out the top hose into the top of the radiator. With the water in the radiator cooling, and new hot water coming in the top, the natural flow in the radiator is downward and into the hose that carries it back to the hot side where it will rise. Get a vertical loop, put all of the heat generating stuff on one side, the heat dissipating stuff on the other, make sure that the water at the top is deep/sufficient enough to carry the flow, and it will flow. Et voila! a thermosiphon! A vacuum at the top would only serve to lower the boiling point of the fluid--counterproductive. Pressure-retaining cap at the top would , and frequently does, raise the boiling point- some utility to be had there but not always necessary. Potential problems will result from things such as insufficient flow which might be traced to things like a restriction on either the warm or cool side or, again, an insufficient amount of water in the overall system which restricts the flow at the top. From of what I've been following on this particular case, It's sounding like a restriction and, with the hot side having been flushed well, it's looking more and more like the radiator. Just for testing, fill the system slightly fuller than you would want it to be normally, up into the neck of the radiator a little. Start cold and carefully note the water lever in the radiator. It stays cold but heats up suddenly. Did the level rise? Water/antifreeze solutions expand as they heat up but not that radically. If you notice the level rising and/or falling, It's a good chance something is boiling somehere there, expanding rapidly into bubbles and the bubble is forcing the hot stuff through suddenly. A thorough flushing or mechanical cleaning then of the radiator would be indicated. But don't rule out teh possibility of a (retro) rocket scientist having retro-fitted some manner of thermostat that could be in there blocking things.

Follow Ups:

• Re: Re: Re: farmall c overheating part 2 One other thought 12:48:58 02/20/02 (1)
  • Re: Re: Re: Re: farmall c overheating part 2 jason r 13:14:11 02/20/02 (0)

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