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Old 10-11-2018, 06:52 PM   #1
Brand: Thor Motor Coach
Model: Quantum RS26
State: Virginia
Posts: 36
THOR #7007
An irritating problem hopefully resolved.

I own a 2017 Thor Quantum RS26 with an E-450 chassis running a V-10 motor. In the thread I posted two years ago about my trip to Wyoming and Colorado,, I mentioned picking up what I thought was pre-ignition while driving at high altitude (about 5800 miles on the clock). It began under load a little after 2000rpm and was gone by 2200rpm. However, when I got home and had the dealership look at it, they determined it was a bad serpentine belt and belt tensioner. When repaired the RV had 7855 miles on it. The problem didn't reoccur until 9557 miles, this time a much louder rattle, like rocks being shaken in a can. This repair lasted only 450 miles when at about 10,000 miles a slight rattle, just like the first time, began to happen. I could get it to rattle by simply putting the RV at 2100rpm under slight load, like a gentle incline.

I just had the RV repaired by my dealer (10,730 miles), but this time they researched the problem and solution. They found that even though there is no factory recall or notice, other dealers were having the same problems on V-10 motors in E-450 chassis. The solution is to install a serpentine belt 1/2" shorter than the original. This puts or tension on the belt and tensioner, reducing or eliminating belt "flapping" and the attendant rattle. The RV now drives as it should, without any annoying rattle at 2100rpm.

Of course, I'll have to watch for the noise coming back in a few hundred miles, but if after a few thousand miles it is still quite, I will consider the problem solved.

Keith Herrington

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Old 10-11-2018, 07:35 PM   #2
I Think We're Lost!
Bob Denman's Avatar
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
Congratulations! I hope that your problem is 100% solved!
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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Old 10-14-2018, 12:08 PM   #3
Junior Member
State: Arizona
Posts: 18
THOR #10296
We just had this happen to us on our 2017 RS26 E 350 at 5500 miles. I have taken a screenshot of your post for future reference just in case it happens again. Thanks very much.
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