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OK, let's start at the beginning. Was the tractor doing this before the work you did, or is it something new? Are you sure your thermostat is in the right way round? Getting it backwards can cause this. Is the radiator overfilled - so is it just getting rid of what it doesn't want? Ask yourself what the cause of the radiator leak was - was it old age, or high pressure? If you think it may have been high pressure, suspect the head gasket - not a big job to do and worth doing sooner rather than later. If you do do the head gasket, use the opportunity to vacuum out all the old rust and muck from the water jacket in the block - esp. towards the driver end of the block where the flow is slower. To check your head gasket, buy another rad cap, or use your old one, and insert a tyre valve into it (without the valve insert). Put this cap on the rad. and then attach a tyre pressure gauge (round gauge type, not the old fashioned bar type)to it. If your head gasket is gone, you will see large pressure fluctuations above your 4lb cap limit. You can also use this setup attached to a foot pump (with the valve insert IN) to do a pressure test for leaks. Is your water pump working properly, and pumping water? I have seen pumps that don't leak, but don't work either because the impeller is loose on the shaft - so no water circulates. This can cause large 'bubbles' of water vapour to form in the block (like water boiling in a kettle) and when these expand violently they can cause the effect you have seen. Hope this helps.
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