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Tractor Talk Discussion Forum

overheating?

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oj

09-03-2006 09:46:03




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Queastion for you all, How hot is Hot in a diesel motor? My combine"s temp guage say"s i"m running hot, a themometer into the coolant reads 200F (94C)is this hot or not? Rad cap is an 11psi one and the engine develops a little over that when the guage reads RED. Once the load is removed from the engine it cools rapidly. The rad was removed and cleaned last summer and is clean now, i"ve removed and checked the water pump, it seams fine (no play/or signs of malfunction), the thermostats were removed the other day, that makes no differance to the operating temp. The belts look good and aren"t running in the bottom of the pulleys, what next? Any answers greatfully received...

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old art

09-03-2006 19:50:55




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 Re: overheating? in reply to oj, 09-03-2006 09:46:03  
ran into that once the fins were pluged with fine hairs from loading horse manure take a water hose and squirt from the back forward and watch what comes outyou will be suprised.



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oj

09-03-2006 17:01:41




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 Re: overheating? in reply to oj, 09-03-2006 09:46:03  
Thanks for the input guys. Today we put a pressure tester on the rad and ran the combine down the field to see what would happen. Pressure tester showed 12psi and stable. The new rad cap which arrived this morning is a 0.7bar (11psi)and at least now it appears to build preesure. The top rad hose was running at 115C (230F) and the bottom hose at 95C (203F)i think, it was hard to get close to the bottom hose. The combine in question is a Claas 106 (same as a Massey 8460) and runs a Mercedes 401 V6 motor (640 cubic inch). I'm presonally starting to lean towards two theroies, 1 faulty guage/sender, or 2 rad is shot(again).

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buickanddeere

09-03-2006 13:00:16




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 Re: overheating? in reply to oj, 09-03-2006 09:46:03  
200-220F from the engine outlet into the rad is fine. The engine doesn't even clean up and burn fuel proper until on the high side of 195F. Just keep a decent rad cap on it and make certain the corrosion inhibiter is active. Everybody checks for the freezing temp but forget about corrosion until hole sar epitte dthrough the sleeves. Use distilled or demin water to mix and fill the cooling system. Anything out of a well or ditch contains minerals that will plate out onto the heat exchanging surfaces. The only engine that needs to run 160F to 180F is a turbocharged/supercharged gasoline race engine.

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Allan In NE

09-03-2006 10:55:43




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 Re: overheating? in reply to oj, 09-03-2006 09:46:03  
OJ,

Can you see circulation in the radiator? 200 degrees is not hot. 300 is hot.

Don't 'spose we have a bad guage thing going on do ya?

If the machine is an IH, I'd bet the wife's pet pig that it is the gauge. :>)

Allan



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bradk

09-03-2006 10:01:31




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 Re: overheating? in reply to oj, 09-03-2006 09:46:03  
OJ,
I'd get a hand held pyrometer and take a reading at rad inlet vs.outlet temp.You should see AT LEAST a 20 degree (f) difference.Take the reading directly on the hoses as these can't correctly read air temp.



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the tractor vet

09-03-2006 09:57:52




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 Re: overheating? in reply to oj, 09-03-2006 09:46:03  
My advice is to put a new thermostat in a new cap on it and a new gauge for startres make sure that the belts are propperly set and you have good flow of air comming thru the rad . Now you could be starting to get compression into the cooling system because of a head gskt . starting to leak or and injector well being cracked as you did not say what engine or make of combine this is or you could have a pin hole in a sleeve allowen comp. to enter the system . Could be the inpleller is slipen in the shaft on the water pump could be that the injection pump timming is off could be restricked airflow to the engine because of a pluged air filter and causing and over fuel condution , turbo going out . There are alot of could bee's and will take some seirous tracking down to find the problem.

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oj

09-04-2006 18:35:43




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 Re: overheating? fixed i think... in reply to the tractor vet, 09-03-2006 09:57:52  
Thanks all for the usefull coments. I think we"ve solved the problem. I changed the fan belks this morning and it seams to have had the disired effect, the combine ran cool all day today. Thanks again.



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