Posted by NCWayne on July 23, 2014 at 14:19:46 from (173.188.169.54):
In Reply to: Re: Water pumps posted by Mike M on July 23, 2014 at 10:21:33:
I know I"ve heard a major problem with the small Kubota diesel engines is the owner using too much antifreeze. The way I understand it, antifreeze in it"s pure form isn"t that great of a conductor of heat, instead, it will insulate. Mixed properly, up to 50/50, it does just what it"s designed to do and carries the chemicals to prevent corrosion, keeps the water from freezing, etc. However anything over a 50/50 and it will act as an insulator and prevent the water from carrying away the heat as well as it does at lower percentages. In turn that can cause the engine to run hotter than normal.
In the case of the Kubota"s, one customer was having problems with the head gasket leaking, and eventually a cracked head. What they told him was that running too much antifreeze was causing the engine/head to get too hot, in turn causing it to warp and, in that case, eventually crack due to the thin walled passages inherent in an engine that small.
As far as why too much antifreeze would cause a problem with a seal, it"s beyond me. I"ve worked with numerous types of mechanical face seals over the years, and beyond the things I mentioned above I have never seen an instance when the fluid being pumped would cause a problem. Possibly in this case it was just what I described here, and the coolant couldn"t cool the seal properly due to the higher percentage of antifreeze, thus causing it to fail.
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