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-   -   High exhaust system temp affecting DEF and tire pressure? (https://www.irv2.com/forums/f278/high-exhaust-system-temp-affecting-def-and-tire-pressure-552916.html)

Tim Fox 09-09-2021 06:50 AM

Jerry, while I’ve checked my temps, they have never given me a reading high enough to concern me. In all honesty, I don’t recall temps. I’m headed to AIM event at Swan Bay this coming Monday. It’s only forecasted to be in mid 70’s, but I’ll take a look and see what I get.

MuggsnMe 09-10-2021 04:05 PM

Tim
We just arrived here today at the AIM’s event.
Outside temp, 73, beer temp 32 F
Just incase you were interested
Thanks
Bob

Butte64 09-12-2021 08:40 AM

It looks like alignment is the answer. One side of tire showing more wear. Disappointing since I had alignment checked at Spartan in June. Now Iím a long way from home and Josams.

brobox 09-12-2021 08:46 AM

Quote:

Originally Posted by Butte64 (Post 5910680)
It looks like alignment is the answer. One side of tire showing more wear. Disappointing since I had alignment checked at Spartan in June. Now I’m a long way from home and Josams.

JME, Spartan left my steering timing 180 degree out after aligning my front end. By the time I reached Columbia MO the outside edge of the tire was worn. Last place I will trust for an alignment. The computer printout from Perry Legends comparing Spartan was unreal.

Tim Fox 09-13-2021 06:40 AM

Jerry, I drove about 150 miles yesterday at about 68 mph. Temperature was about 78 degrees. I started with 85 lbs on all the rears. Left tag got to 97 psi and 115 degrees F. Right tag got to 98 psi and 117 degrees. As reported on the valid tpms.

Gary.Jones 09-13-2021 11:03 AM

Whole different angle.... Maybe

Any possibility that you have brake shoes dragging more on one side than the other side and your tire temp problems are due to brake heating rotors which then heat tires and nothing to do with tire pressures????

Gary

Greg Hindson 09-14-2021 04:18 PM

Quote:

Originally Posted by Butte64 (Post 5906162)
Tim, the pressures are close. The PS tag hits 101 and alarm goes off. The DS tag is about 99 at that point. ThThe big difference is the temp. The PS tag goes to max 104 and DS tag max 102. The big variance is in temp. The PS tag gets much hotter than DS tag or drive tires. It gets up to similar temp as steer tires.
What temp do you see on your tag and drive tires?

I notice that the tires that are on the side where the sun is shining will have higher pressure because of the higher tire temperature.

vanlieremead 09-14-2021 05:58 PM

Definitely! If I stand still more than 10 minutes in a hot day with the engine running, the exhaust side gets hot and alarms.

Butte64 09-14-2021 06:50 PM

Quote:

Originally Posted by vanlieremead (Post 5914031)
Definitely! If I stand still more than 10 minutes in a hot day with the engine running, the exhaust side gets hot and alarms.



Thanks, good to know!

Butte64 09-14-2021 06:52 PM

Quote:

Originally Posted by Tim Fox (Post 5911928)
Jerry, I drove about 150 miles yesterday at about 68 mph. Temperature was about 78 degrees. I started with 85 lbs on all the rears. Left tag got to 97 psi and 115 degrees F. Right tag got to 98 psi and 117 degrees. As reported on the valid tpms.



Good to see your temps are similar.

Butte64 09-14-2021 06:54 PM

Quote:

Originally Posted by Gary.Jones (Post 5912257)
Whole different angle.... Maybe

Any possibility that you have brake shoes dragging more on one side than the other side and your tire temp problems are due to brake heating rotors which then heat tires and nothing to do with tire pressures????

Gary



Interesting thought. How do I check? Iíve used an IR heat gun in various places around the wheel and donít see anything out of order.

photraveller 09-15-2021 11:54 AM

Jerry, it's weird that one side gets affected more than the other, but I would still lean toward alignment issue. Plus, I haven't had any luck with Spartan Alignments. Find a good 3 axle truck alignment shop along your travels.

In our case, with pressures in drive and tag tires set at 85, our tags would heat up 10-15 PSI higher than the drive axle tires. After proper alignment, the hot PSI for the tags are still higher, but usually around 5 PSI higher than the drive axle tires.

Sadly, the wear I was seeing on the tag tires (one side bevel on each tire), continued until I replaced them last year. Even though I got religious about dropping tag pressure on all tight turns.

Steve

Gary.Jones 09-16-2021 01:04 PM

I've owned this Cornerstone (with disc brakes) now for about 3.25 years, and I have been in extensive stop and go traffic situations, once in New York state and once around Denver Colorado. In both, I am talking 30 - 40 miles of stop and go travel. Denver, I remember very well as there was some huge festival south of Denver and maybe 20 miles north of Denver, traffic came to a complete stop and then for ~ 40 miles went from stop and go, to traffic seemingly clearing, traffic picking up speed to 40-50 mps and then suddenly having to brake hard back to a crawl and stop-and-go crawling forward before repeating this whole process again and again. Never been in anything like these two situations before in all my driving.

The point of my story is that I began getting amber warnings on my tire pressures and tire temps on the tag and drive tires and then red tire pressure warning on all my drive and tag tires and I was VERY concerned and worked my way to the berm so I could check tire pressures. They were indeed high. Then I used an infrared thermometer to measure tire temps and the surface of the tires were high, but not all that critical. So, I measured the temps of my aluminum wheels and the wheels were very hot. By examining all around, what was very clear was that the wheel heat was from the disc brake rotors. The sun had nothing to do with these elevated temps. The very high temps were from the constant braking and even high speed braking in this "crazy" traffic pattern. I was heating the rotors highly and since the rotors are connected with the wheel mounts, the temps and pressures sampled from sensor bonded directly to the wheel with stainless steel bands, (not simply mounted on the stems) the brake heat was producing the excessive heat and pressures.

It took an hour or more at normal interstate speeds once this crazy stop-and-go pattern resolved before I was able to cool the rotors/wheels/tires to get the idiot lights back to the green range on the dash.

A dragging brake/rotor would imitate exactly your problem, IMO.

Any competent truck brake shop should be able to figure out this possibility.

Gary


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