Re: water leak, frost plug (follow up from yesterd

Posted by Andy Martin on January 04, 2005 at 07:41:49 from (64.219.39.195):

In Reply to: Re: water leak, frost plug (follow up from yesterd posted by cheinzle on January 04, 2005 at 07:08:05:

Excellent calculation. Except that the rain cap gap around the shifter reduces the diameter to 3/4", or 3/8" radius, so I get 295 years.

Assuming the cavity is 30 gallons, and you exchange 5 gallons of air per day through thermal cycling, and you condense half the days of the year, you are getting the moisture out of 900 gallons of air. Assuming further that only half the moisture runs down the case and gets trapped under the oil, you have 450 gallons of air. Of course the moisture condensed out of the air depends on the relative humidity of the air entering the cavity and the temperature drop overnight and in the morning before the air is expelled upon reheating the next day. Any calculations indicate it would be possible to accumulate one gallon of water in just a few years. Operating and heating the oil will not cause much water to evaporate since it is trapped under the oil and the saturation point of water in oil is quite low.

When the water builds up to where the gears stir it into the oil, you start to get real contamination and possible problems.

Most all old tractors will drain a little clear water out of the drain plug first.

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