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Overheating 93 Cummins



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Old 08-07-2013, 02:32 PM   #1
Da New Guy
 
Join Date: Jul 2013
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BHA43 just gettin started
Overheating 93 Cummins

New member & part time Texan! I bought this truck in Iowa with 200K on it runs & drives good. I put 2500 miles on it as a test drive (including 2 hr pulling a loaded 24" enclosed trailer on a 90 plus day ) with no problems before I loaded up to haul down to a place I just bought near San Antonio. As far as I can tell it is all stock. I adjusted the bands & changed filter & fluid when I had it down for a shift shaft seal. The trans pan was spotless & it shifts crisp & clean! Back to the load I didn't scale but it was pretty heavy!


It was 85 & humid the morning we left, & the engine temp started building within 20 miles & pegged the stock gauge. I pulled off & allowed it to cool 15 min. Checked the rad. it was down maybe 1 pint & the thermostat was open & circulating! I drove back on 2 lane blacktop @ slower speed to my shop (I own a towing co. & salvage yard) we changed out the fan & rad from one of my old rollbacks that I knew didn't over heat. Also replaced a leaking o ring between the ps pump & timing cover that showed up! Took off again with the same results, pegged the gauge but did not puke any fluid. Limping back to the shop it cooled down again. I thought the gauge may be lying so I intalled a mechanical gauge & took off again. Same results! Limped home again. Off loaded everthing from the Dodge into Nephew's 8.1 auto Yukon & took off again 8 hours late & my pride & diginity in my back pocket. It handled the load just fine with no over heating.
So now I am back in Iowa caught back up & time to solve the problem. First guess, I figure a trans prob. rather than engine? It has stock pan, the fluid goes from the trans to the stock trans heat exchanger then to a small stock cooler in front of the rad. behind the AC cond then back to the trans. (I was not using the AC that day yet) It does not have a lock up converter. I plan to put a similar wieght & areo load on the trailer & monitor the trans with a freshly installed elec. trans gauge in the "out line" and snake a mechanical gauge down the dipstick tube. After verifiing the fins are clear on everything!
I have put 100's of K on this gen Dodge with no problems, all were sticks except for one 2wd D3500 & it had a cooler with electric fans mounted back ahead of the gas tank. I drove it to West Virginia thru the mountains with a UD 1800 with a roll back on a gooseneck trailer. It was spring temps that trip. I no longer have that truck (divorce) so I can't see if it was factory or added on or how it was plumed!
If I can monitor & conclude the tran's is the prob. I plan on adding a deep pan & a elec. fan cooler between the trans & the factory heat exchanger mounted back in front of the fuel tank, then leave the little air cooler in front of the rad. I figure giving the heat exchanger already cooled fluid it may help bring the eng. temp down rather than raise it? If that doesn't cure the prob. then another thought is a tighter T-converter?
This has prob. been covered here plenty but thought I would get some input if you don't mind. thanks BHA43
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Old 08-08-2013, 08:48 PM   #2
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I had a similar problem on my '91 a while back. Turned out to be the fan clutch was bad. You said you replaced the fan, but not sure if that included the clutch or not since it's kind of a pain to hold the pulley while loosening the reverse threaded nut. I checked mine by sticking a rolled up newspaper in it while running. If it stops, you know it's not pulling anything.
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Old 08-08-2013, 10:22 PM   #3
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