NT304C overheating: NorTrac Tractors  -- Chinese Tractors Discussion Forum and Review NT304C overheating: NorTrac Tractors -- Chinese Tractors Discussion Forum

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 03-20-2009, 10:02 Post: 161274
sjrogers1



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 NT304C overheating

We have a NT304C that has been overheating. We replaced the thermostat, temp guage and coolant. The tractor after a period of running starts spitting coolant out of the overflow. The temp guage reads about 170. Any ideas on what to check for the overheating problem? Is it possible to put a catch tank on the overflow? Tractor has about 100 hours.






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 03-20-2009, 10:21 Post: 161275
greg_g



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 NT304C overheating

If that's 170F, your temp gauge is almost certainly off. Even with straight water, the cap shouldn't release till 212F - higher with antifreeze. But since the OE gauges are metric, perhaps you just converted from Centigrade to Fahrenheit incorrectly.

Your replacement thermostat should have been in the 70C to 80C range. If it's the wrong fit, it could simply be blocked shut. Depending upon the metric number stamped into your cap, it should only be replaced with one in the 3psi to 7 psi range. If headbolts aren't retorqued at 50 hours, you could have a head gasket problem. One possible result is to introduce exhaust into the cooling system. That can raise the cooling system pressure high enough to burp the pressure cap. Check for oil in the radiator - or coolant in the oil pan.

Many new owners don't realize how much seeds and chaff get stuck in the radiator fins. The stuff collects in the lower 1/3, often hidden behind the battery. Left go to long, the radiator has to be removed for soaking and cleaning with compressed air. Side note; never use a pressure washer to clean these radiators - it will crush the delicate aluminum fins.

And yes, overflow tanks that are designed to accommodate closed systems work fine. The cheap $10 kits from JC Whitney work just fine on both my Chinese tractors.

//greg//






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 03-20-2009, 12:22 Post: 161281
auerbach



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 NT304C overheating

Ensure all air-cool passages are clear, the fan and belt are OK, and the antifreeze mixture is right.

If the temp gauge is accurate, the problem would seem to be the spitting, not any overheating, and a tank would fix. But if your manual said to torque the headbolts at 50 hours (which may be the case with Chinese diesels) and you didn't, could be a leaking head-gasket.






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 03-20-2009, 18:33 Post: 161287
sjrogers1



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 NT304C overheating

We ordered the new thermostat and guage from Northern Tool. We did not retorque anything at 50 hours. How can we check for a head gasket leak? If the head gasket is leaking what will we need to replace besides the head gasket?






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 03-20-2009, 22:00 Post: 161292
auerbach



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 NT304C overheating

Mainly coolant in the oil and/or oil in the coolant. But a little can be hard to detect so unless it's obvious, look for an engine shop that has a Snap-On sniffer that detects oil in a sample of coolant.

Just the gasket, but you should have a service manual for the torque specs etc.

You could run it for short periods if it's a cooling system problem, but you don't want to run it at all if the gasket's going.






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 04-13-2009, 19:28 Post: 161994
sjrogers1



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 NT304C overheating

It does look like we will need to replace the head gasket. My brother-in-law ran the tractor with the radiator cap removed and saw lots of bubbles in the coolant. Hopefully Northern provides the torque specs and torque sequence in the manual. How many hours should we run it before we retorque?






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 04-13-2009, 23:07 Post: 162001
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 NT304C overheating

Well, you should have retorqued it and adjusted the valve lash at new+50 hours. So it follows, that you should perform the same maintenance at head gasket+50 hours

//greg//






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 04-14-2009, 11:21 Post: 162009
Murf



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 NT304C overheating

Quote:
Originally Posted by greg_g | view 161275
But since the OE gauges are metric, perhaps you just converted from Centigrade to Fahrenheit incorrectly. Your replacement thermostat should have been in the 70C to 80C range.



Greg, are you sure you didn't slip on the conversion yourself?

70 Celsius equals 158 Fahrenheit.

80 Celsius equals 176 Fahrenheit.

That's a big spread in the temperature range, most small diesels I've come across want no less than about a 180 thermostat since they don't make much heat till you work them.


Best of luck.






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 04-14-2009, 14:24 Post: 162017
greg_g



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Originally Posted by Murf | view 162009
Greg, are you sure you didn't slip on the conversion yourself?70 Celsius equals 158 Fahrenheit.80 Celsius equals 176 Fahrenheit.That's a big spread in the temperature range, most small diesels I've come across want no less than about a 180 thermostat since they don't make much heat till you work them.Best of luck.

Guess you haven't run across many Chinese tractors then Murf. First off, they're all metric - to include the temp and pressure gauges (centigrade and pascals). The vast majority run 80C thermostats, the gauges reflect 80C as green - 100C as red. A few come across the Pacific spec'd at 70C. I used both numbers just to get the OP into the right range, because others have screwed up thinking it couldn't hurt to put a Chevy 195F thermostat in them. The cooling systems are simply not engineered for that kind of heat and pressure.

Now that I reflect on it, my Mercedes turbo-diesel also uses an 80C thermostat. There was an 85C option for places that have no winter weather.

//greg//






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 04-14-2009, 16:50 Post: 162022
earthwrks

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 NT304C overheating

Greg: "There was an 85C option for places that have no winter."

Laughing out loud
Maaaan! And to think all these years I've been told every place has a winter. Lied to again!






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