D6C Overheating

Roger12356 · Jul 10, 2016

I have a 1970 Cat D6C non turbo dozer. Serial 10KXXXX I replaced the belts and the fan is blowing air through the radiator. When I push trees and light duty stuff it is fine. When I start hogging up dirt and really work it, it will warm up to the red. I can stop and idle for 3 minutes and it cools down where I can operate it again, for a while. It is never low on coolant. It does have the engine enclosures on the motor. Does anyone have experience with this problem? Should I remove the engine enclosures? I built a terrace late last fall. It was cool enough I had to wear coveralls and a heavy coat etc. I could work the heck out of it all day and it didn't heat up to the red. It has to be something minor I would think?
Thanks for any help

derwen1959 · Jul 10, 2016

some years ago I cant remember how many but that is not important I had similar problem with our john deere 2040 most of time there was no problem but when it was used heavy in hot weather the temperature would rise .. air was sucked through radiator but there was dust coating on radiator core acting as insulation preventing heat getting out when I hosed the radiator there was big improvement in cooling also the fanblade was dirty and when I cleaned it there was even better cooling
I should point out that the tractor had been neglected by previous owner

Farmall43 · Jul 10, 2016

Re tighten the belts. New belts tend to stretch a bit.

NCWayne · Jul 11, 2016

Another thing to check. Look on top of the radiator, for a round piece with a couple of bolts in it. That is the pressure valve/vent, that does the same thing the radiator cap in a car does. These will often get corroded, the rubber rots, etc, and won't allow the cooling system to build pressure.

This can cause problems. It's not that hard to get the pieces and rebuild it. The main thing is coat everything with penetrating oil before hand, and give the bolts a love tap to 'break them loose', before trying to loosen them.

Hoboy · Jul 15, 2016

two other things it could be. Does it have a reversible fan on it and if it does are all the fan blade turned in the same direction, if one is off or different it will cause it to overheat when you work it. And since you changed the belts I wonder if this did not happen. Or is your torgue convertor water cooled or air cooled for if it is water cooled this too can overheat the engine under a heavy consistent work load. If this is the case you might have to rebuild the torque convertor.

dozerbill66 · Jul 16, 2016

I worked for a Company about 30 years ago and they had a D7F and they did the same as you replaced the belts and still ran hot , come to find out the belt pullys were worn and new belts would still slip . Change the pullys and never over heated again , He did complain about the price of pullys , not cheap from Cat .

D6C Overheating

Roger12356

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derwen1959

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Farmall43

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NCWayne

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Hoboy

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dozerbill66

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