JD 50 Radiator Overflows

The problem I'm having is the coolant runs out of the overflow on the radiator when the tractor is running. It does not seem to overheat. The temperature gauge reads a steady 140 operating temperature. Any idea what could be going on here. The neighbor guy I bought the tractor off of said he put some stop leak in it to repair a radiator leak. I'm wondering if the stop leak has plugged up the radiator.

This is a really neat old tractor. It had been in the same family since it was new. It's all original except the addition of a 3-point hitch.

I always thought I'd own a Farmall as my first tractor; however, this JD is a real beauty. Thanks for your help.

Kerry

Those radiators have quite a sizable tank area in the top above the core to account for the expansion of the coolant. Could be that it is overfilled, and it 's just burping it out as it warms up. Maybe when it gets to a level that it has enough room to expand without over flowing it will stop.

It could be exhaust gases leaking into the coolant side though a crack or headgasket leak, but if you don't see the coolant dropping or going into the oil, I'd say check how far you are filling it.

Does it gush out ? A head gasket can cause a belch of gas to rise pretty fast and blurp out a lot of coolant.

Let us know what other symptoms there might be.

Frank-in-Tallahassee
70D // 855