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Overheating

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Gary

07-02-2003 08:04:13




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Is there any way externally if a radiator needs rodded out. Truck is a tandem bobtail w/6-71 Detroit. I've mounted a push type fan in front of the radiator, but on these 105 degree days it want to run around 200 degrees. Any suggestions?




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Jerry L /az

07-03-2003 08:26:47




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 Re: Overheating in reply to Gary, 07-02-2003 08:04:13  
I agree with the other posts, worked on a lot of the 6/71's, found that the radiator pressure cap also can cause a heating problem. if you have a tester, test the cap sould hold 14-17 psi, I think, my tester is not here right now so I can't check for sure. just another thought..... .Jer



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george md

07-02-2003 14:13:01




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 Re: Overheating in reply to Gary, 07-02-2003 08:04:13  
Gary , detroit should run 170 to 180 , most times when temperature passes 200 deg you will buy a head .they are commonly known as the engine with the glass head . Check rad for bubbles , could be the seal in the pump sucking air and not leaking water out.

If the bottom tank is bolted to the core , remove the tank and blow thru each tube with pressure washer and clean the out side .

george

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G-MAN

07-02-2003 13:40:11




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 Re: Overheating in reply to Gary, 07-02-2003 08:04:13  
I agree with TO-35Man. 200 degrees at 105 degrees ambient temp isn't something I'd worry too much about, especially on a Detroit. Before you go doing a bunch of work, consider installing a known good gauge to double-check your current gauge. If it also reads 200, I would call it good. Even with a perfect radiator, you're probably only going to drop the temp another 10 degrees or so, especially at 105.

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TO-35Man

07-02-2003 11:05:21




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 Re: Overheating in reply to Gary, 07-02-2003 08:04:13  
Heres a few checks...remove cap and look inside with flashlight...if you see crud usually whiteish caked around the flu's it needs roding.
Most roding jobs if not done by experianced raditor shop will result in core replacement.Check to see if fins are not mashed down...rule of thumb is if 20% is flattened add 10 degrees to temp. Doesnt' take much to add up to a big over heating problem. Napa sells a good fin rake or you can pull up a stool and take a small screw driver and gentley straighten them. Is your raiditor stopped up with grass ,grease or dirt? If so wash and or gently blow out with compressed air,you would not believe how many trucks and cop cars have this problem mostly from idling or driving thru fields or meadians on roads.Check you exhaust system for flow sometimes a flattened pipe or closed pipe tip will run your temp up a little.And lastly if all these seem ok you might need a new thermostat.Then again a Detriot running 200 at 105 degrees is not that bad....remeber boiling point is 210 with no antifreeze.
hope this helps...

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Allen

07-02-2003 14:24:51




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 Re: Re: Overheating in reply to TO-35Man, 07-02-2003 11:05:21  
If you can, feel the radiator with your hand, if it feels hot at places and cool at others it is plugged there



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