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TO20

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tom

04-27-2001 19:01:32




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I have a Ferguson TO20 that has been overhauled, just about everything new. The problem I have is that it spits out the coolant. I put a new thermostat (one that is in the top radiator hose), the tractor will run almost hot then the thermostat will open, cools down, heats up again and it acts like the thermostat closes and then opens again. It does this contunuely while the tractor is running. Just before the thermostat opens it spits out some coolant. Was this normal for the TO20's? Can I leave the thermostat out? It is irrerating to see the coolant fun out of the overflow pipe. I put in a new radiator, water pump, oil pump, rings, crank, bearings, valve guides etc... thanks for any input.

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eddie

04-28-2001 15:25:34




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 Re: TO20 in reply to tom, 04-27-2001 19:01:32  
sounds like either a bad thermo or in upside down, a little trick i learned a long time ago is to take a very small drill bit and drill a hole somewhere in the flange of the thermostat that wont interfere with the valve. what this does is, it allows a small amount of coolant to pass thru the thermo allowing for a litle slower warm up but no sudden drop in temps as the thermo opens and closes. this is just my opinion but, i think its easier on the motor to warm a little slower rather than get hot then cool so quickly. it also helps to eliminate air pockets when flush/filling the system.

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tom

04-28-2001 15:31:29




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 Re: Re: TO20 in reply to eddie, 04-28-2001 15:25:34  
thanks for the tip, tom



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B.C.

04-28-2001 09:54:12




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 Re: TO20 in reply to tom, 04-27-2001 19:01:32  
When we first got our MH50 with the Z134 gas engine it always ran cold. Turned out the thermostat was stuck open. Like others said, it ran fine that way. When the thermostat was replaced it pretty much maintained temperature and ran a little better as well. I'd guess either you got a bad one or it's in backward.



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tom

04-28-2001 10:53:45




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 Re: Re: TO20 in reply to B.C., 04-28-2001 09:54:12  
I have been known to do things backward, but I think it was a bad stat. I removed it and cured the problem of spitting out the coolant. It's not a real hard working tractor as it is too pretty to really use. One of those kind that you stick too much money in to use...Ha thanks for your input.



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marlowe

04-27-2001 20:01:50




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 Re: TO20 in reply to tom, 04-27-2001 19:01:32  
try it with the thermostat out will not hurt a thing are you sure it;s the right one and put in right you might have a bad head gasket or a busted head head bolts at right tork?



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tom

04-28-2001 10:50:10




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 Re: Re: TO20 in reply to marlowe, 04-27-2001 20:01:50  
thanks, head was rebuilt and was torked 65 to 70 lbs. Head was cracked but had it repared.I removed the stat and solved the problem of spitting out the coolant. thanks



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Ray,IN

04-27-2001 21:28:24




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 Re: Re: TO20 in reply to marlowe, 04-27-2001 20:01:50  
Not normal at all. Perhaps the thermostat is installed backwards. Direction of flow is into the top of rad. Loosen the cap to the 1/2 notch and warm the engine. Remove the cap and look for bubbles in rad., if present, bubbles can be from leaking head gasket. If no bubbles, can you see the flow of coolant coming into the rad? Remove thermostat and repeat. Still no flow indicates pump problems, or plugged system somewhere. Check the easiest first, the stat is probably the culprit. I have bought new stats that were bad, that's frustrating! Put the stat and a candy thermometer in a pan of water and heat to boiling;watch the thermometer and record the temp that just begins to open the tractor stat. Orginal stats are full open at 180deg. F. Most people don't have any problems with removing the stat, but under heavy load at open throttle, the coolant circulates so fast there is no time to cool it; conversly a cold engine cannot burn fuel efficiently, you burn more fuel and soot up the engine in winter. That's my spin on your problem and on thermostats.

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tom

04-28-2001 10:46:30




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 Re: Re: Re: TO20 in reply to Ray,IN, 04-27-2001 21:28:24  
Thanks, the head seems to be fine, had it plained and new head gasket, new water pump. Saw no bubbles. Last night I took the stat out and tried without it. The tractor did not heat up real hot, but cured the problem of spitting out the coolant. I figure it must be the stat. Will try a new one again. thanks.



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