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05 Superduty 5R110 fire

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Old 05-23-2017, 01:22 PM
lg3rd
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05 Superduty 5R110 fire

I was towing a 16' Carmate Box trailer (empty), in tow/Haul mode, through the mountains on the PA turnpike. On an uphill section, 70 mph, suddenly blue smoke was pouring out of the back of the truck. I immediately slowed to about 50mph and pulled over at the next opportunity, about a mile. The bottom of the trans pan was coated with fluid, mostly on left side and the exhaust crossover pipe was smoking. Gauges were all normal. Ambient temp was 90F.

I drove another 40 miles, mostly about 60 mph. No problems. When I started climbing in elevation, and hit 70mph again, the smoke started again. I pulled over again and crawled under to fine the crossover pipe in flames. I grabbed a rag and beat out the flames. Fluid was red. Gauges were normal again. Once I disconnected the trailer, I can find no leaks. Snugged pan bolts. I cannot duplicated the problem without the load and speed. Any suggestions?

Background: 2005 Crewcab, 5.4, 5R110 trans, 3.73. 416,000 miles, I have towed about 50K miles of that. Trans always ran great. Never replaced.
 
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Old 05-23-2017, 01:51 PM
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Sounds to me like you're overheating the front seal of the trans. Do you have a cooler on the trans? If so, then it's probably dirty, clogged and not working, I'd drop the fluid and change it for clean new stuff, spray out your cooler if you have one and take it for another spin, then again , you may have overheated that seal to the point it's just going to leak.
 
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Old 05-23-2017, 02:19 PM
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I just checked, The trans cooler is pretty beat up, enough to impede airflow, in the exposed areas. Trans fluid has about 15K miles on it. No loss of fluid on dipstick. Trans fluid is ready to drip from the rear pan bolts and is heavy around the trans cooler line connection.

Could a heat related build up of pressure push fluid past the aged pan gasket, or could there be a crack in the case around the cooler line connection? I will clean it good and look for cracks on the weekend.
 
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Old 05-23-2017, 04:20 PM
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Heat doesn't cause a build up of pressure in the trans. The trans is vented so that it can't build pressure.

Since you have no loss of fluid on the dipstick, and it obviously lost fluid, the trans was overfilled. That will cause it to push fluid out of the vent.
 
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Old 05-23-2017, 04:25 PM
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Hopefully there are more qualified people that can answer, but I'd say yes the fluid probably could get pushed past fitting connectors and possibly even the pan gasket, but i don't know how much pressure it. Would take to do that.
 
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Old 05-23-2017, 07:53 PM
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Originally Posted by Mike1 View Post
Hopefully there are more qualified people that can answer, but I'd say yes the fluid probably could get pushed past fitting connectors and possibly even the pan gasket, but i don't know how much pressure it. Would take to do that.
There ain't nobody more qualified then the guy that posted above you.
 
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Old 05-23-2017, 08:01 PM
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Originally Posted by Mike189677 View Post
There ain't nonbody more qualified then the guy that posted above you.
I'll say!!!!
 
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Old 05-23-2017, 08:43 PM
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Originally Posted by Mike1 View Post
Hopefully there are more qualified people that can answer, but I'd say yes the fluid probably could get pushed past fitting connectors and possibly even the pan gasket, but i don't know how much pressure it. Would take to do that.
Much more pressure than is possible inside the transmission. It won't happen.
 
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Old 05-24-2017, 07:14 AM
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Originally Posted by Mike189677 View Post
There ain't nobody more qualified then the guy that posted above you.
I didn't see his post, I was on my phone replying to lg3rd 2nd question.
But anyway, Mark Kovalsky, you're saying that a trans can't build pressure because of the vent, what happens when (If) the vent becomes clogged or somehow blocked? Will it build pressure then?
 
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Old 05-24-2017, 09:13 AM
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Yes it will.
 
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