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Old 09-18-2020, 05:18 PM   #1
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Vibration when accelerating - Fixed

Since we have owned this coach (2 yrs) there has been a slight vibration when accelerating from a dead stop. At speeds over 10 mph it is completely gone and the coach rides smooth at all other speeds. We had new tires installed shortly after purchasing the coach so that was always suspect but couldn't isolate. Spoke to Freightliner and I asked if the driveshaft needs to installed in the same position as it was removed and the representative said no that they are balanced off the coach. He didn't mention "phasing" and I was unaware of that term at the time. Fast forward to today and did some additional searches and found several articles re. phasing the driveshaft. Sure enough it was 90 degrees out. Spoke to Freightliner again and the rep did mention that the driveshaft does need to be phased correctly. Also found the 12 point bolts that hold the u straps were not tight at all. Apparently the motorhome was towed when in the possession of the prior owner for a defective starter. Can only assume the tow truck driver reassembled the driveshaft incorrectly and the repair shop never checked for phasing or tightness of bolts. It was a rather easy job to correct but messy. The 12 point strap retaining bolts should be torqued to 115-135 ft lbs on our coach.
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Old 09-18-2020, 05:27 PM   #2
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Always good when you figure it out and fix it yourself without spending $$$.

Congratulations
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Old 09-18-2020, 05:52 PM   #3
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In 2015 I had to have my coach towed. When I picked it up and drove it home I noticed a slight vibration so I crawled under and looked. Sure enough, they did not have the driveshaft in phase. Pulled it and corrected and all is good.
This was a Cummins shop so just goes to show you need be aware of any change in driving or sound. They also screwed up my thermovalve which I had to replace.
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Old 09-18-2020, 05:57 PM   #4
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Good catch on your part. Most people would never understand what phasing of a drive shaft is.
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Old 09-18-2020, 06:03 PM   #5
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Don and Kim
How did you tell it was not in Phase?

What did you see?

Is their a mark or what?


Can anyone verify that their drive shaft is in phase?

How do you do that?


Thanks.
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Old 09-18-2020, 06:04 PM   #6
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Understand it [50/50 chance] but how do you verify it is in or out of phase?
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Old 09-18-2020, 06:11 PM   #7
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Once again you guys have fixed one of my problems,,,I read this forum almost daily and the folks here just amaze me with the combined knowledge you share.... I Have the same vibration taking off from a stop...just looked at mine and sure enough it is out of phase...Thanks is not enough for mentioning this ....previous owner must of had it towed....
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Old 09-18-2020, 06:11 PM   #8
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https://managedmobile.com/driveshaft...ng-importance/
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Old 09-18-2020, 06:14 PM   #9
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I believe our coach was repaired at a Cummins shop also, disappointing that they did not check driveshaft phasing since its not a big deal to fix.
The first pix shows the driveshaft as I found it, 90 degrees out of phase. The second pix shows the 2 yokes at the end of the driveshaft in the same plane. Here's a link that has some additional info.

https://www.irv2.com/forums/f258/cla...-413986-5.html

Post #64 shows a diagram of out vs in phase. Not hard to verify as long as you can safely get under the coach.

Don
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Old 09-18-2020, 06:40 PM   #10
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Now I'll be crawling under the coach to check.
Thanks for the info. Seems like I'm learning something new constantly.
Thanks to this website and everyone sharing their experiences.
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Old 09-18-2020, 07:23 PM   #11
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Quote:
Originally Posted by IMDiesel View Post
Don and Kim
How did you tell it was not in Phase?

What did you see?

Is their a mark or what?


Can anyone verify that their drive shaft is in phase?

How do you do that?


Thanks.
Look at the OPs second picture. That's in phase.

Here is another look.Click image for larger version

Name:	Capture%2B_2020-09-18-21-22-46.jpeg
Views:	10
Size:	87.0 KB
ID:	301518
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Old 09-18-2020, 07:24 PM   #12
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Quote:
Originally Posted by Old Scout View Post
Understand it [50/50 chance] but how do you verify it is in or out of phase?
There is no chance. Its in phase or not.Click image for larger version

Name:	Capture%2B_2020-09-18-21-22-46.jpeg
Views:	8
Size:	87.0 KB
ID:	301519
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Old 09-18-2020, 08:15 PM   #13
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That is simple and quite clear.



Never considered it on my diesel pickup.
But then I didn't have to remove the drive train to tow it either.
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Old 09-19-2020, 07:21 AM   #14
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Years ago I bought a 10 yr old Winnebago Cl a with very low miles. Original owner said he hardly drove it because of an annoying mid speed vibration.

I took the drive shaft off and had it balanced that eliminated the vibration.
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