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overheating 9n

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Rick

06-18-2004 13:11:00




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Replaced the head and still gets hot after 5 minutes. Is there a thermostat and where is it?
I am stumped. Could I have a cracked block that is heating the water to boil?
-Rick




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gahorn

06-18-2004 15:32:16




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 Re: overheating 9n in reply to Rick, 06-18-2004 13:11:00  
Rick, You DO have an operating governor on that thing don't you? If one tries to run a N without a governor it'll over-rev and seriously overheat...even tho' it don't sound like it's overrevving. Putting a governor back on it solves the problem. (Not that I've ever witnessed such a thing, but that's what I was told by my brother-in-law's cousin's next-door neighbor's boyfriend.) ;Þ



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Rick

06-18-2004 17:29:21




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 Re: Re: overheating 9n in reply to gahorn, 06-18-2004 15:32:16  
Yes the gov. works.



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Dell (WA)

06-18-2004 14:20:03




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 Re: overheating 9n in reply to Rick, 06-18-2004 13:11:00  
Rick..... ..with a cold engine, remove yer radiator cap. Starter up, innna'bout 1 minute your finger can feel warm water circulating in the top of the radiator, innna'bout 5 minutes will be normal operating temperature. (burnie-burnie)

IFF-NOTT, ya gotts yer upper radiator hose mounted thermostat installed BASSACKWARDS. (don't ask) Turn engine off and wait for it to SPEW!!! (it will) Then reverse the hose mounted thermostat. Keep it close to cylinder head water outlet with an extra hose clamp.

You did remember to "re-torque" your recently replaced cylinderhead gasket after running for about 30 minutes, didn't you? Doo-itt!!!

As a general rule, N's Cooling systems are considered to be "OVER-COOLED". But OLD radiators gitt clogged tubes and rusted-off fins and loose their cooling capacity. Good radiator shops can "rodd" the tubes and test for flow or re-core the radiator; but the honest truth is, its usually cheaper to buy a new radiator..... .....Dell

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Rick

06-18-2004 17:31:38




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 Re: Re: overheating 9n in reply to Dell (WA), 06-18-2004 14:20:03  
It has no T-stat in the hose.



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so? . . . Dell (WA)

06-18-2004 19:52:25




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 Re: Re: Re: overheating 9n in reply to Rick, 06-18-2004 17:31:38  
Rick..... ...didja perform the finger test? Finger test works wheather you have a thermostat or not. Didja retorque the cylinderhead bolts??? Didja consider you may have a clogged cooling system? Can you PROVE you don't have a clogged radiator?..... ....respectfully, Dell



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craig

06-18-2004 13:46:38




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 Re: overheating 9n in reply to Rick, 06-18-2004 13:11:00  
If there is a thermostat, I would remove it for a while just to see if that is the problem. If it is I would replace it with new. My 8n didn't have one for the 1st year I had it. After putting one in, I found that the tractor ran alllllot better.

Good luck Craig.



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Rob

06-18-2004 13:23:55




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 Re: overheating 9n in reply to Rick, 06-18-2004 13:11:00  
If a radiator is over-filled it will blow off steam and boiling water after maybe 30-minutes run-time depending on ambient.
Radiator should be filled to just cover the core and not one drop more. Even one inch over-fill turns into a lot of steam, spitting, and holy smoke. **The latter from the operator.



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Rick

06-18-2004 13:34:46




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 Re: Re: overheating 9n in reply to Rob, 06-18-2004 13:23:55  
Rob, The engine is overheating. Its not just purging extra coolant. Motor runs good while cool and then boils. I did have it full to the rim though. Could not find t-stat in hose either. It doesnt seem to have one?
-Rick



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Rob

06-18-2004 15:24:42




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 Re: Re: Re: overheating 9n in reply to Rick, 06-18-2004 13:34:46  
If you had it full to the rim it was boiling off overfill, and lots of it. It will really steam and blow.
Tstat will bring the temp up. Don't know how it would cool an engine. Need a tstat though. Stat will do a lot to keep moisture out of the engine oil. A good breather cap helps too.



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Jeb2N

06-18-2004 15:55:29




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 Re: Re: Re: Re: overheating 9n in reply to Rob, 06-18-2004 15:24:42  
I was thinking that if the T-stat was stuck closed, it would cause it to overheat.

Also, running a lean mixture will make it run hot.



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Rob

06-18-2004 16:26:57




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 Re: Re: Re: Re: Re: overheating 9n in reply to Jeb2N, 06-18-2004 15:55:29  
I bet a stuck stat would cause it to overheat!
Probably blow a hose wouldn't it? I don't know what would happen if the stat was stuck and water couldn't get to the radiator. The pressure in the block must get pretty high.



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Rob

06-18-2004 16:21:56




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 Re: Re: Re: Re: Re: overheating 9n in reply to Jeb2N, 06-18-2004 15:55:29  
I bet a stuck stat would cause it to overheat!
Probably blow a hose wouldn't it? I don't know what would happen if the stat was stuck and water couldn't get to the radiator. The pressure in the block must get pretty high.



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Jeb2N

06-18-2004 16:51:03




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 Re: Re: Re: Re: Re: Re: overheating 9n in reply to Rob, 06-18-2004 16:21:56  
No, I don't think a stuck thermostat would blow out a hose unless the hose was very soft and old anyways. What does the water pump do when the thermostat is closed and the engine is warming up? The pump is a vane type and as such, water doesn't have to be pumped. The vanes can just "slip" basically and not move any water, but the water provides resistance to the pump. No, you wouldn't blow out a hose, but the temperature would get on up there.

Jeb

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Rob

06-18-2004 17:09:57




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 Re: Re: Re: Re: Re: Re: Re: overheating 9n in reply to Jeb2N, 06-18-2004 16:51:03  
Well if the water in the block is boiling and the pump is pumping and the stat is stuck where does the pressure go? Maybe it goes back-wards like the pump isn't there. The water pump is a centrifugal pump. Not the same as a vane pump.
A centrifugal pump will cavitate. The water pump might do that. That can get noisy. Not sure it would cavitate but it would not like real hot water running back-ward through it. There would be pressure, a lot if there was cavitation.

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Jeb2N

06-18-2004 13:16:16




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 Re: overheating 9n in reply to Rick, 06-18-2004 13:11:00  
Yes, there is a thermostat (usually). There are a lot of N's out there without them but just as many with. The N thermostat kinda floats inside the upper radiator hose. Grab the upper hose and try to squeeze it. If you feel something hard in there, that's your T-stat. You can pick 'em up at TSC for next to nothing and it's a 10 minute job to replace. Just drain the radiator water down to a reasonable level and remove the upper hose. Push the old one out and the new one in. Re-install hose and add water and you're off. Simple as diagnosing electrical problems!

Jeb

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