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Jubilee overheating

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Beargap

07-06-2006 05:10:16




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My Jubilee has started overheating/boiling over after about an hour or two of heavy work, something new in the last couple of weeks. The just-replaced gauge shows temp staying just below center green until is shoots up quickly. Has been refilled with 50/50 antifreeze until last night when all I had was water. Radiator is fairly new and is free of obstructions. Fan is good (pulls air toward engine), although the shroud is missing. Radiator cap is old and does not build up a lot of pressure, based on squeezing the radiator hose.

So, what are the likely causes? I'll look at replacing the cap and the thermostat, but should I be looking for a shroud as well? As an aside as to things that are different this year, one axle and both hubs as well as the brake shoes were replaced last winter when it was very cold. Now they something seems to be dragging and squeeking on hot days after using the tractor for a while. Would the added load contribute that much to overheating? Thanks.

=Vic=
Bear Gap, PA

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Dave in Ms

07-06-2006 07:30:55




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 Re: Jubilee overheating in reply to Beargap, 07-06-2006 05:10:16  
Vic, I'd look first at your thermostat. Start the engine cold and run it with the radiator cap off until it heats up, then look in the radiator to see if the water is moving. If it's not, replace the thermostat. I live in the South and have run my 640 without a fan shroud for years without overheating. The water pump could be the culprit, but they usually leak before going out. Then again, the impeller could have rusted away to thepoint of not pushing the coolant. You can check the pump flow by running the engine with the thermostat removed from the system, and watching the coolant movement in the radiator. No movement = bad pump. As for your brakes, if they are dragging that's more load on your engine and that makes more heat. Adjust the brakes and see if the problem goes away.

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Beargap

07-06-2006 10:19:09




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 Re: Jubilee overheating in reply to Dave in Ms, 07-06-2006 07:30:55  
Well, just after ordering a thermostat I went to use the tractor for a small job and noticed what I thought was coolant from the radiator overflow line on the left front of the tractor after driving only a couple of hundred yards. Since the temperature was still quite cool, I was surprised, but looking in the radiator I saw the coolant was below the top tank. I unscrewed the grill fasteners and Wow! A stream appeared at the lower left of the radiator core. Seems the grill has cut into the fins there and when pulled back the flow is pretty good. So, I guess I'll have to find someplace out here in the country that can repair the radiator. Not sure what to do about that grill, though...I'll have to study what there is about the fit that is causing the problem.

In the relm of things going bad, today the 3-pt is moving much slower than before, too. Since everything under the lift cover was serviced or replaced last Spring, I guess I will have to look at rebuilding the piston pump, now.

=Vic=
Bear Gap, PA

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