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CATEGORY LISTINGS > FORD DIESEL > 89 7.3 (aftercmarket turbo) engine over-heating [ REFRESH ]
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89 7.3 (aftercmarket turbo) engine over-heating


Created On Thursday July 03, 2008 15:45 Diesel Talk
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nthe10range
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Joined: Jul 2008

Note Thursday July 03, 2008 15:45 View thread in raw text format
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I have a 1989 7.3 dully with an after market turbo. 7.3 motor has only 100K. About four years ago had Diesel Injection Pump bumped up 10% with the injectors calibrated to the pump. About 3 months later, had complete, complete, complete, cooling system gone through...new. Soon after, temp gauge on dash started acting up. It would go all the way to “H”, but when I would tap on dash panel would go back below “C”. Changed to a new analog (12V) temp gauge, where it reads temperatures between 195 – 210F. However, when I pull my fifth wheel, pulling almost any grade engine temp will rise to 220 – 230 F., and even running down a flat highway (with the 5th wheel) with the air conditioning on, she’ll run back up to 225 – 230+F. If I turn off the air, and run her slow on grades, temp stays around 195 -218F. The replacement radiator, according to my radiator shop, was a high-flow type, typical to that used in large diesel trucks. Clutch fan is new also. My diesel mechanic tells that 230F is too hot for a diesel. It never had any heating, (if 230F is to hot) issues before I had the described work done, even when I pulled the fifth wheel or had the air on. Looking back, perhaps I should have left the injector pump/radiator factory stock, as it sure is perplexing to say the least Any input would be very much appreciated. Thanks.

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nthe10range
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AZDieselman
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Joined: Mar 2007

Note Friday July 04, 2008 06:18 View thread in raw text format
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There are a couple of things that could cause your high temps. The one I see the most is the wrong T-stat. You MUST buy it from Ford or IH. I know the aftermarket stores say theirs will work, they don't! Check this first. Kevin
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nthe10range
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Joined: Jul 2008

Note Friday July 04, 2008 19:05 View thread in raw text format
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I appreciate your input...the T-stat (2nd one) I have in it now is from Ford, a 190F. And, according to Ford, there is no other T-stat lower-tmep than a 190 from Ford that can be purchased.

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nthe10range
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AZDieselman
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Joined: Mar 2007

Note Friday July 04, 2008 22:45 View thread in raw text format
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OK, I see wrong T-stats fairly often. I know you said the clutch fan is new, is it a Ford or an aftermarket clutch? I know the Ford ones are expensive, I have to buy them for my own trucks, but they work much better than the others. What is the condition of the condenser, trans cooler? Are the fins folded over, restricting airflow? Do you have a fan shroud? Do you get alot of exhaust smoke? Mine run clear just about all the time, I have a similar setup, my water will heat up on a long pull if I keep my foot in it. I watch the pyro more than the coolant temp. Kevin
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nthe10range
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Joined: Jul 2008

Note Saturday July 05, 2008 09:29 View thread in raw text format
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I'll need to check to see if the clutch fan was a Ford or Hayden my mechanic installed. Condenser has no fins folded over. Trans cooler new...installed 4 months after original work described. No restrictions. Have stock fan shroud installed. Runs clear most of the time...no excessive black smoke. The thermo for pyro was installed directly to the driver side exhaust manifold. My diesel mechanic said that the pyro should have been installed where turbo dumps into exhaust (passenger side). He just said that the actual turbo temp is most likely about 250-300F less than what I show on my pyro, by it being where the thermocoupler was installed on exhaust manifold. Pyro runs where it should. By the way, if we were not exchanging text, it’s almost as though I am speaking, to my diesel mechanic his name is Kevin. Thanks for all your concern, comments/suggestions.

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nthe10range
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