Re: Re: Re: Farmall A Questions from a Newbie

Posted by Farmalldan on July 29, 2003 at 10:07:47 from (64.154.26.248):

In Reply to: Re: Re: Farmall A Questions from a Newbie posted by Bob B on July 28, 2003 at 19:34:30:

Bob,
Forgot your question about petcocks. The factory petcock (at least on later tractors) has a diamond shaped head. However, I'm not certain about earlier petcocks. I need to look at a F-12 or F-14 to see what they had. The early A shared may of the standard components with these tractors. The purpose of the petcock was related to using distillate and kerosene fuel. These heavy fuels required quite a bit of heat to vaporize. If the engine wasn't hot enough, vaporization was incomplete and the raw fuel did not burn. Instead, it washed by the rings and into the crankcase, diluting the engine oil. Standard operating procedure for these fuels was to drain one quart from the crankcase at the end of the day and replace it with one quart of motor oil. This was done by opening the lower petcock and allowing the oil to drain down to that point. Then you closed the petcock and added a quart of oil. Add to the mix a suspicion of the accuracy of dipsticks and it makes a little more sense, doesn't it.

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