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Allis Chalmers Discussion Forum
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D-12 Series III running hot

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Vinnie

09-03-2005 05:54:15




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This tractor is used for mowing. Engine has just been overhauled, new sleeves, pistons, bearings, head job, new waterpump and radiator, new 160 thermostat, new temp and oil gauges, same oil pump.
Problem: It seems to run hotter than I would expect, over 200 degrees. I verified the new thermostat opens at 160 by boiling it in a pot with a thermometer on the stove. The thermostat is installed correctly. The old temp gauge only displayed "Normal" so its hard to know exactly how hot it was. On start-up the oil pressure is around 20-30 psi, but as she gets hot, it goes to nearly zero. I haven't run it long enough to see how high it will go, but 210 seems too hot for a 160 thermostat. I probably should have replaced the oil pump. Could it be that it is not lubricating the engine well enough and it is getting too hot due to friction? Any tips or advice is appreciated. Anyone know how hot theirs really runs under load?

-Vinnie

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bw in mo

09-05-2005 17:03:34




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 Re: D-12 Series III running hot in reply to Vinnie, 09-03-2005 05:54:15  
Vinne , check the timeing, if it is slow it will run hot.



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old

09-03-2005 08:30:40




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 Re: D-12 Series III running hot in reply to Vinnie, 09-03-2005 05:54:15  
I'd start by doing a system flush, dosen't cost much to do and may help. Drain the read. system and then fill with vinagar, run it an hour or so. Let cool and drain the vinagar and then flush it out with water. If it has a drain in the block hook the hose to it and take the cap off the rad and let it flow out the cao for and hour or so. Then refill with antifreeze and see how it does. Alos check the hoses and make sure that they are good, one of the maybe closed up and slowing the flow of coolant.

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