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Update on HOT!! Oliver Hart-Parr 70

Welding man

Welding man

Well-known Member
Location
West Virginia
Ran Compression test- 100 PSI across all 6 cylinders. Filled cooling system with water-put 10 psi air pressure on radiator for a few minutes-cranked her over -no water in cylinders. Put leak down tester with 75 psi air in each cylinder. No air bubbles in radiator. I think it's fair to say it is not the head gasket or cracked head. Sending radiator to shop Monday. Keep you posted.
 
(quoted from post at 21:46:07 08/28/21) Ran Compression test- 100 PSI across all 6 cylinders. Filled cooling system with water-put 10 psi air pressure on radiator for a few minutes-cranked her over -no water in cylinders. Put leak down tester with 75 psi air in each cylinder. No air bubbles in radiator. I think it's fair to say it is not the head gasket or cracked head. Sending radiator to shop Monday. Keep you posted.
Click to expand...

Another check might be to makevsure the fan bldes have not been fitted the wrong way round.
 
If only you had some way of measuring the amount of air going in to the radiator in front vs what's blowing from the fan at the back. I still wonder if the problem is the lack of a shroud, so the fan is sucking air in from the sides instead of through the radiator? In a car without a shroud, you have the speed going down the road pushing air through the rad, but with a tractor, all of the air has to be pulled by the fan.
 
The radiator has an electric fan fastened to the inside of the radiator. I removed the original and installed a 14in. electric fan.It runs the same speed if idling or wide open. It is not an air flow problem either, I am sure. If the radiator doesn't cure it, I'm going to try the orfice plate in the hose and if that doesn't work, I'm tearing it down to a naked block and starting over.
 
Ok, I misread on your other post. I thought you said it had the original fan and no shroud. I've had three tractors have the core tubes get plugged and ran hot. I had them re cored and that fixed it.
 
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