[AT] vapor locking

[charlie hill]

John, on my cars and trucks prior to these new computer operated engines and 
on my tractors I sometimes drill a little by-pass hole in the thermostat so 
that it always circulates a little bit of coolant even when the t-stat is 
closed.  I don't think that would help your vapor lock problem but it might 
address the convection/thermosyphon issue when you shut the engine down. 
Just drill a very small hole 1/16" or so somewhere in the metal that 
surrounds the operative part of the t-stat.

Charlie
----- Original Message ----- 
From: "John Hall" <jthall at worldnet.att.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Thursday, June 19, 2008 10:01 PM
Subject: Re: [AT] vapor locking


>I am kind of thinking along the lines of the thermostat or water pump
> myself. We talked about flushing the system as well. All the "external"
> things such as clean radiator, engine, and belts are pretty much a daily
> maintenace thing so they are not the issue. Since it never vapor locked
> while running I would assume maybe the thermostat is not letting the water
> cycle when the engine is off (convection/thermosyphon). The heating and 
> the
> vapor locking will both have to be adressed this summer.
>
> John
> ----- Original Message ----- 
> From: "Thomas Mehrkam" <tmehrkam at sbcglobal.net>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Thursday, June 19, 2008 11:08 AM
> Subject: Re: [AT] vapor locking
>
>
> If the engine is running hot. That will cause vapor lock.
>
> It sounds like you have a running hot problem not a vapor lock problem.
>
> The usual suspects are.
>
> 1. Thermostat
> 2. Water pump. "Impeller bad?"
> 3. Radiator clogged.
>
>
> I assume it has water.
> It is not 100%antifreeze. "Will over heat"
> The radiator is not clogged internally.
> The radiator is not clogged externally.
> The fan belt is tight.
>
> etc.
>
>
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