Diesel Pusher exhaust overheating toad tire

[Folio]

Hi everyone,
This is my first post, though I've lurked around for a bit the last several months. We are in our first season RVing, driving a 2012 River Forest Berkshire (diesel pusher--DP?) pulling a 2005 Honda Accord with four wheels down. Have a TPMS system for tire monitoring. Typically the right front tire pressure of the toad runs 5-7lbs highter and at least 10 degrees hotter than the other tires, even though all four tires are set at 32lbs when cold. The only reason I can think of this happening is that the right front tire of the toad is directly behind the diesel exhaust.

Today in eastern Montana on I-94 in 100+ degree heat, the TPSM alarm sounded when the right front tire hit 40lbs and the tire temp was pushing 140 degrees. Exited fast and let things cool down.

If my theory is correct that the tire is being affected by the exhaust of the MH, what solutions do you veterans suggest? The tires on the toad are new and I hate the thought of the torture that right front one is taking.

Thanks in advance for any help/suggestions/ideas.

Ray

[pasdad1]

Maybe direct the exhaust in a different direction ?

[AFChap]

I have noticed the right front tire on my 05 Honda Odyssey ...directly behind the diesel exhaust ...tends to run 20-30 degrees hotter than the left front, and a little higher psi. But I have never had the TPMS alarm for high temp or psi.

[Anthem15]

I've been in the engineering business for many years and just find it difficult to imagine the tire is being overheated that much by exhaust from the rig. Exhaust is immediately mixed with ambient air and should equalize within a very short time. Possible, I suppose. I would first make sure that the pressure/temp sensor ion the overheating tire s working correctly. If it is, you may be onto something. However, not sure how you'd solve it. :S Not much help. Let us know what you find out.

[mwallin]

Originally Posted by Anthem15

I've been in the engineering business for many years and just find it difficult to imagine the tire is being overheated that much by exhaust from the rig. Exhaust is immediately mixed with ambient air and should equalize within a very short time. Possible, I suppose. I would first make sure that the pressure/temp sensor ion the overheating tire s working correctly. If it is, you may be onto something. However, not sure how you'd solve it. :S Not much help. Let us know what you find out.

Agree sounds more like a dragging brake.

[2 Stroker]

Get a heat gun and see if you have a brake problem, a bearing problem or no problem.
https://www.amazon.com/dp/B072BN7995...7ZNGP7Y0&psc=1
I have one with me all the time.
2 stroker

[Mr_D]

feon WA State!

My exhaust is at 90° to the rig and I haven't seen any problems.

[G Schulz]

Try swapping the two front sensors with each other and see what your readings are. If it follows the sensor then it is most likely a sensor issue. I personally don't think the exhaust could be heating up your tire from that distance.

[montyhp]

I've been through this. Exhaust is heating up your front tire. I have driven my dp towing my silverado like that for 20000 miles. Hubs are not hot. I think you are going to have to get a lot hotter before it causes any problems.

[what next]

I do notice on my setup that the right front tire is a couple of pounds higher and the temp is little higher than the rest. Always attributed to the exhaust on right side angled down. I have switched senors around reading is same. I will use my heat gun next time and trace heat back to exhaust, see what reading is at tailpipe end. You went over your high pressure setting, 40 lbs I really doubt if it will damage tire. Hey I have an Accord also maybe because car sits low it traps more heat.

[stang37]

Been through this also verified on this trip that the exhaust is indeed helping to heat up the right front tire and sensor. I carry an infrared heat gun with me and check all hubs occasionally. I to saw a rise in the tire pressure and temperature. I stopped and checked the disk brake rotor and the bearing hub. Both were within a few degrees of the left front. I believe the sensor reads the exhaust more than the actual tire, rotor and bearing hub.

[Folio]

Gosh, thanks everyone for your replies. Very useful and helpful information, and much to ponder. Am wondering now if I don't have a bad sensor on that right tire; will switch it around tomorrow to see what happens. Don't have a heat gun, but will have to pick one up soon as I can. Dragging brake? Maybe, but they were checked before I left and have no problems driving the car itself--doubt that's the issue, but maybe worth checking out.

Exhaust from coach is pointing directly downward in a direct line to that right tire, so maybe adjusting it out to 90 degrees instead of 180 might help too.

In the morning will also double check tire pressure all around and adjust as needed.

Another hot day on store for tomorrow. Will adjust speeds accordingly and stop as necessary. Will be another couple days before I can check in with a service center to have everything checked. Like I said before, I'm a rookie here and certainly no mechanic or RV expert. Thanks again.

Ray

[AFChap]

As I stated above, I have noticed the same. For the doubters I have seen it over a period of several years now, two different toads, two different TPMS systems. Think about it... Why WOULDN'T a 5" tube blowing very hot gases apx 10 ft in front of something cause it to heat up some? ...even more so at road speed. The Underskirt folks found that even with a Kevlar shield on their product, the hot exhaust gas would melt it. Turning the tip to help push it to the side can help some.

[Dutch Star Don]

How about wrapping some insulation around the sensor and see if it's just the sensor being overheated by the exhaust.