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12-29-2022, 11:21 PM
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#1
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Senior Member
Brand: Thor Motor Coach
Model: ACE 33.1
State: Nevada
Posts: 318
THOR #21278
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2021 THOR ACE (F53) - vibration between 25-30 MPH
I remember reading a post several months ago about something similar. I tried search function using Key Words "THOR, ACE, F53, VIBRATION, VIBRATING, TRANSMISSION". Can't locate the thread. So let me post my question instead, if someone have experienced the same symptoms.
I have a 2021 THOR ACE 33.1 (F53, V8 engine). Purchased new a year ago. We now have around 15K miles.
I noticed this slight vibration (shuddering) when on 2nd gear, going to 3rd gear (speed between 25-30 MPH). After the RV gets beyond or past 30 MPH, no more vibration. I feel it in the front end (not sure if from engine, transmission or tires).
When I took my RV for the annual warranty inspection, I mentioned that vibration to the service advisor. Tech came back and said I need front end alignment as my front tires have uneven wear markings (though I cannot see any, or at least I did not see any). I had my front end aligned by a reputable Truck Alignment shop at around 4K miles, loaded with my normal stuff inside and full tank of gas.
I can't remember when this vibration really started. I just did not pay much attention to it, as it goes away after a certain speed. It concerns me now as the RV is now 1 year old. I want to make sure if the issue is mechanical, FORD warranty covers the fix.
Any thought on what maybe causing this? Can it really just be a simple alignment (re-alignment) fix? Or ss this something I need to call FORD service center?
__________________
2021 Thor ACE 33.1
2015 Forest River Forester 2861DS
2012 Milan Eclipse
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12-29-2022, 11:30 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: Axis 24.1
State: Connecticut
Posts: 1,797
THOR #20289
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With the vibration occurring at 25-30 mph and going away after that, I doubt if it is the suspension or tires.
Transmission, driveshaft or differential maybe?
David
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12-29-2022, 11:41 PM
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#3
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,389
THOR #7035
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Mis-alignments rarely cause vibration problems. The fact that it occurs at a certain speed and then goes away indicates it is a resonant vibration problem.
It could be in a tire or any of the drive train. Take it to a Ford dealer for better diagnosis. One thing you can try is get it to vibration speed on a slight downhill, once it starts vibrating shift it to neutral and let up on the gas. If it goes away it could be an engine/transmission issue. If it keeps vibrating it could be a driveshaft/wheel/tire issue.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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12-30-2022, 12:29 AM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: ACE 33.1
State: Nevada
Posts: 318
THOR #21278
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Thanks for this tip. I will try this method this weekend just to have a basic idea on what "maybe" going on.
But I will definitely visit a local Ford Truck Repair Shop near my house and set up an appointment for diagnosis.
Quote:
Originally Posted by 16ACE27
Mis-alignments rarely cause vibration problems.
It could be in a tire or any of the drive train. Take it to a Ford dealer for better diagnosis. One thing you can try is get it to vibration speed on a slight downhill, once it starts vibrating shift it to neutral and let up on the gas. If it goes away it could be an engine/transmission issue. If it keeps vibrating it could be a driveshaft/wheel/tire issue.
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__________________
2021 Thor ACE 33.1
2015 Forest River Forester 2861DS
2012 Milan Eclipse
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01-11-2023, 10:46 PM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: Freedom Traveller A27
State: North Carolina
Posts: 2,447
THOR #17765
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Quote:
Originally Posted by 16ACE27
Mis-alignments rarely cause vibration problems. The fact that it occurs at a certain speed and then goes away indicates it is a resonant vibration problem.
It could be in a tire or any of the drive train. Take it to a Ford dealer for better diagnosis. One thing you can try is get it to vibration speed on a slight downhill, once it starts vibrating shift it to neutral and let up on the gas. If it goes away it could be an engine/transmission issue. If it keeps vibrating it could be a driveshaft/wheel/tire issue.
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Wheel balance!
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01-12-2023, 02:51 AM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: ACE 30.3
State: Iowa
Posts: 1,232
THOR #28145
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Also, pay attention to whether the vibration go's away once the tires warm up. after all a motorhome does tend sit far longer than a regular vehicle. That will cause "flat spot" on each tire that will work itself out after a few miles of highway driving.
__________________
Dan
2018 Thor ACE 30.3
Towing 2020 Jeep Gladiator
Former 1996 28' Tiffin Allegro owner
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01-12-2023, 03:17 AM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 4,183
THOR #6411
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Quote:
Originally Posted by ador
I remember reading a post several months ago about something similar. I tried search function using Key Words "THOR, ACE, F53, VIBRATION, VIBRATING, TRANSMISSION". Can't locate the thread. So let me post my question instead, if someone have experienced the same symptoms.
I have a 2021 THOR ACE 33.1 (F53, V8 engine). Purchased new a year ago. We now have around 15K miles.
I noticed this slight vibration (shuddering) when on 2nd gear, going to 3rd gear (speed between 25-30 MPH). After the RV gets beyond or past 30 MPH, no more vibration. I feel it in the front end (not sure if from engine, transmission or tires).
When I took my RV for the annual warranty inspection, I mentioned that vibration to the service advisor. Tech came back and said I need front end alignment as my front tires have uneven wear markings (though I cannot see any, or at least I did not see any). I had my front end aligned by a reputable Truck Alignment shop at around 4K miles, loaded with my normal stuff inside and full tank of gas.
I can't remember when this vibration really started. I just did not pay much attention to it, as it goes away after a certain speed. It concerns me now as the RV is now 1 year old. I want to make sure if the issue is mechanical, FORD warranty covers the fix.
Any thought on what maybe causing this? Can it really just be a simple alignment (re-alignment) fix? Or ss this something I need to call FORD service center?
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Accelerate to about 30 mph where you feel the vibration and then shift to neutral while taking your foot of the acc pedal. If the vibrations is still there and then lessens when gradually goes away, you have a drive line or wheel problem. It it goes away intermediately, you probably have an engine vibration.
The V-10 shakes so violently at some rpms, there is a 8 lb balance shaft on top of the left cylinder head above the camshaft. It is gear driven by the camshaft at 1/4 engine speed. it helps but does not eliminate the even shaking harmonics.
__________________
Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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01-12-2023, 11:35 AM
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#8
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Senior Member
Brand: Thor Motor Coach
Model: Freedom Traveller A27
State: North Carolina
Posts: 2,447
THOR #17765
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Quote:
Originally Posted by Dan-sr@perra-us.net
Also, pay attention to whether the vibration go's away once the tires warm up. after all a motorhome does tend sit far longer than a regular vehicle. That will cause "flat spot" on each tire that will work itself out after a few miles of highway driving.
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It goes away after 35 mph. I doubt this is it. Old nylon cord tires used to flat spot.
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01-12-2023, 06:04 PM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: Tuscany 40ex
State: Ohio
Posts: 455
THOR #12726
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I have seen many things cause vibrations at certain speeds and most common are wheels out of balance which will be noticed at the same speeds and go away @ 10-15 mph above the speed it started at. Now out of balance can be from several different reasons and most common are the cords separating from impact of chuck holes or bouncing over curbs, next would be you lost a wheel weight, less likely would be the tire wasn’t mounting correctly, either way I would lift the front end and place a block of wood as close to the tire sidewall and spin the wheel, do the same to tread as well if you can see the gap between tire and block change or tire hits the block it’s a wheel problem.
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03-03-2023, 04:21 PM
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#10
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Senior Member
Brand: Thor Motor Coach
Model: ACE 33.1
State: Nevada
Posts: 318
THOR #21278
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I was finally able to take the RV out last week for a 600 mile round trip to Cali. I did what some had suggested. I shift the transmission to NEUTRAL and let off the gas pedal once I start feeling the vibration. The vibration is still there once it started, until I go over a certain speed. Also disappeared when the speed goes BELOW certain speed (all when the tranny is in NEUTRAL and foot off the gas pedal). I will take the RV to Discount Tire and have them inspect and balance the tires. If it is still there, I will then take it to a tuck shop to check front end alignment.
__________________
2021 Thor ACE 33.1
2015 Forest River Forester 2861DS
2012 Milan Eclipse
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03-03-2023, 04:40 PM
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#11
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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Often, when they "stretch" the frames for specific applications, the drive shaft is extended and may have 1 or 2 "carriage bearing" allowing several sections of drive shafts to complete the additional length. You may have a drive shaft balance issue or one of your u-joints/carriage bearings going out.
__________________
Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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03-03-2023, 05:02 PM
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#12
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Site Team
Brand: Entegra
Model: Accolade 37TS
State: South Dakota
Posts: 8,781
THOR #1469
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Quote:
Originally Posted by The Gritz Carlton
Often, when they "stretch" the frames for specific applications, the drive shaft is extended and may have 1 or 2 "carriage bearing" allowing several sections of drive shafts to complete the additional length. You may have a drive shaft balance issue or one of your u-joints/carriage bearings going out.
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More often the stretch is behind the rear wheels with no increase in wheelbase or drive shaft length. Easily verified by doing a VIN search and see which wheelbase was delivered to Thor. The frame extension is often the reason for the large rear overhang.
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03-03-2023, 05:36 PM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: Freedom Traveller A27
State: North Carolina
Posts: 2,447
THOR #17765
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Quote:
Originally Posted by simidrm
I have seen many things cause vibrations at certain speeds and most common are wheels out of balance which will be noticed at the same speeds and go away @ 10-15 mph above the speed it started at. Now out of balance can be from several different reasons and most common are the cords separating from impact of chuck holes or bouncing over curbs, next would be you lost a wheel weight, less likely would be the tire wasn’t mounting correctly, either way I would lift the front end and place a block of wood as close to the tire sidewall and spin the wheel, do the same to tread as well if you can see the gap between tire and block change or tire hits the block it’s a wheel problem.
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Cords separating don’t cause out of balance. A separation vibration indicates a failure soon. Plus a separation causing a violent vibration should be very visible. There is such a thing as out of round. Have Discount tire check with a run out gauge.
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03-03-2023, 05:37 PM
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#14
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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With the rolling shortages of everything over the past 3 years it's possible they could have used whatever was available. Wheelbases can be shortened or extended easily. But, as you said, it would be easy to find out. There's probably a carriage bearing in the driveline either way. Personally, I think it's a tire balance issue. Balance issues will come and go with speed variations. Often a wheel can sling a weight off.
__________________
Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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03-03-2023, 05:41 PM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: Freedom Traveller A27
State: North Carolina
Posts: 2,447
THOR #17765
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When mine was new it shook pretty good. Upon my inspection, no wheel weights at all. Both Ford & Thor claimed the tires were balanced and the front end aligned. That was BS. Took it to a truck shop. Front tires balanced, alignment, CHF, and stabilizer. Now I can cruise one handed. I doubt Ford balanced and aligned a stripped chassis. And Thor didn’t give a ____ !
__________________
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03-03-2023, 06:47 PM
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#16
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,389
THOR #7035
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Quote:
Originally Posted by ador
I remember reading a post several months ago about something similar. I tried search function using Key Words "THOR, ACE, F53, VIBRATION, VIBRATING, TRANSMISSION". Can't locate the thread. So let me post my question instead, if someone have experienced the same symptoms.
I have a 2021 THOR ACE 33.1 (F53, V8 engine). Purchased new a year ago. We now have around 15K miles.
I noticed this slight vibration (shuddering) when on 2nd gear, going to 3rd gear (speed between 25-30 MPH). After the RV gets beyond or past 30 MPH, no more vibration. I feel it in the front end (not sure if from engine, transmission or tires).
When I took my RV for the annual warranty inspection, I mentioned that vibration to the service advisor. Tech came back and said I need front end alignment as my front tires have uneven wear markings (though I cannot see any, or at least I did not see any). I had my front end aligned by a reputable Truck Alignment shop at around 4K miles, loaded with my normal stuff inside and full tank of gas.
I can't remember when this vibration really started. I just did not pay much attention to it, as it goes away after a certain speed. It concerns me now as the RV is now 1 year old. I want to make sure if the issue is mechanical, FORD warranty covers the fix.
Any thought on what maybe causing this? Can it really just be a simple alignment (re-alignment) fix? Or ss this something I need to call FORD service center?
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You have a harmonic imbalance. Probably caused by the uneven front tire wear. The alignment may have fixed the cause of the uneven wear but the tires still have 15K+ miles of wear on them. Your testing proves it is rool rate specific and you feel it in the front. Have the tires inspected and balanced and maybe rotate the fronts to the rear.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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03-03-2023, 06:56 PM
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#17
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 34R
State: Indiana
Posts: 616
THOR #19887
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What ACE is reporting above is probably the cause and solution but I just want to leave registered here that I installed centramatics on my MH before it was 10K miles and it really smoothed the ride...
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03-03-2023, 07:19 PM
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#18
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,389
THOR #7035
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Quote:
Originally Posted by RACarvalho
What ACE is reporting above is probably the cause and solution but I just want to leave registered here that I installed centramatics on my MH before it was 10K miles and it really smoothed the ride...
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I also have Centramatics on the front of my MH. In my experience they work better than balance beads but don't hep a rough road or and out of round tire.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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03-03-2023, 07:25 PM
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#19
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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Quote:
Originally Posted by Jimbo56
When mine was new it shook pretty good. Upon my inspection, no wheel weights at all. Both Ford & Thor claimed the tires were balanced and the front end aligned. That was BS. Took it to a truck shop. Front tires balanced, alignment, CHF, and stabilizer. Now I can cruise one handed. I doubt Ford balanced and aligned a stripped chassis. And Thor didn’t give a ____ !
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Tires are delivered to most assembly plants already mounted and balanced by the vendors.
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03-03-2023, 07:31 PM
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#20
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 34R
State: Indiana
Posts: 616
THOR #19887
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Quote:
Originally Posted by 16ACE27
I also have Centramatics on the front of my MH. In my experience they work better than balance beads but don't hep a rough road or and out of round tire.
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I first installed in the front and asked the crew to check if they could fell vibration in the rear....
They did so I installed in the rear too.
Really like that and no reason to be concerned with balancing anymore....
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