1997 IH 4700 DT466 Allison AT500 question...

Posted by John_PA on July 06, 2012 at 20:51:08 from (71.182.170.179):

I have a 1997 IH4700 with a DT466 and an Allison AT500 automatic transmission. (wish it were a spicer 7, personally, but I got a good deal on it.)

Here's a refreshing picture of it, on this 100 degree day...



So, taking a 120 bushel load(should be nothing for a dump that can legally carry 13,500 lbs of payload) to the elevator today, it started playing tricks. Now, I know it is hot outside, but, it shouldn't do this. When going uphill on the highway at 55 mph, it started to blow blue smoke pretty heavily out the exhaust pipe. Then, within a few minutes, the tempurature gauge hit 230 and all the warning lights came on for running hot. It is full of coolant. It has 107,000 original miles on it. The one thing it does have is a new muffler that was put on it by a shop in December. I'm wondering if maybe the muffler is restricting teh exhaust flow too much and causing the turbo to get too hot, which is allowing teh seals to leak. Once I go below 55 mph for a distance(say 45 mph) it will quit doing this. I don't have a pyrometer on the exhaust. I'm guessing that it will say I'm running really hot.

Does anyone have any experience with one of these engines in a truck? I fooled with them in tractors, but never in a truck. The transmission really makes that thing rev high almost all the time. running 65 mph it is at 2700 rpm nearly. Coming back, unloaded, it was running cool and no smoke, but I was careful not to go a click above 55 and keep my foot out of the gas tank going up any hills. There is one 7% grade I climb empty that is about 2 miles long. I went up that hill at 40-45 mph empty and it just started to heat up near the top, but, nothing serious.

What would be the first thing to check if I were to start checking things. Any bus mechanics here? I hear the school buses run this combo a lot. I've seen a few single axle fifth wheel trucks for sale with this combo, advertised with a 24 foot grain trailer. After fooling with just 200 bushel at a time, I don't know if I would want to carry 400 bushel with the same drivetrain.

Thanks in advance for any and all suggestions and advice. I really appreciate it.

Replies:

• Re: 1997 IH 4700 DT466 Allison AT500 question... JK-NY 06:57:14 07/08/12 (0)
• Re: 1997 IH 4700 DT466 Allison AT500 question... John_PA 21:19:37 07/07/12 (0)
• Re: 1997 IH 4700 DT466 Allison AT500 question... John_PA 21:00:32 07/07/12 (0)
• Re: 1997 IH 4700 DT466 Allison AT500 question... Phil9N3667 16:01:44 07/07/12 (0)
• Re: 1997 IH 4700 DT466 Allison AT500 question... MSM 06:05:17 07/07/12 (0)

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