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Old 11-11-2012, 07:35 AM   #1
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vibration driving me nuts

hello all i am new to this forum and aslo new to rving. i purchased a like new 2002 newmar moutian aire gas motorhome. it has 15000 miles on it i have been completely thought iit. shocks batteries tires, alaignment. have had the complete motorhome gone thu. hrer is the issue. at 54 to about 58 mph. there is a vibration. can feel it in stearing wheel seat gas petal you also feel it in the passenger seat. we have been through all the items that could cause the vibration. tires balance front end u joints harmonic balancer to no avail. now i have been told that it might be the driveshafts may need to be balanced, or the flywheel may have lose a weight. any input. ps i thought that flywheels were drilled to balance then. any input would be welcome. thanks doug
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Old 11-11-2012, 07:47 AM   #2
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Just to get started, I would check the drive shaft by listening for a 'clunk' when going from forward to reverse. Should not be slack in the drive shaft(s).
Tires - check the DOT date code (last 4 numbers stamped on the tire after 'DOT') - if the tires are original (XX02 date) they are end of life. Or if the RV sat a long time the tires may need a good long trip to heat them.

P.S. What chassis - Ford or Workhorse.
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Old 11-11-2012, 08:06 AM   #3
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thanks for your reply. tires are new,driveshafts have been checked all tight. nothing loose in the front end, tires have been rebalanced also they moved tires from front to rear all with no change in the vibration.
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Old 11-11-2012, 08:11 AM   #4
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oops forgot its a workhorse chassis
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Old 11-11-2012, 09:33 AM   #5
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A clunking U-joint isn't necessarily an indication of an out of balance driveshaft, just loose or worn U-joints. If everything else in steering/alignment/tire and wheel balance has been inspected and eliminated, the next step would be driveshaft before going after the flywheel. I too thought they were drilled to balance.
I think your shop should be able to jack up the rear end and run the speed up to 58 mph. That should reveal the vibration if it's coming from the driveshaft.
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Old 11-11-2012, 11:03 AM   #6
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Pull the drive shafts and take to a driveline rebuilder. They will be able to spin in a lathe and add balance weights. Also check the U joints and make sure they are in time.
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Old 11-11-2012, 11:17 AM   #7
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Vibration driving me nuts

Ckassic symptom of an out of round tire..Front tires. May have to. Be trued after testing.. Jack front end and spin tires moving a piece of wood closer abd closer to rhe tire until it touches.. If it touches only certain points on the tire and not evenly, it needs truing...rkl
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Old 11-11-2012, 11:34 AM   #8
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Quote:
Originally Posted by vettenut0 View Post
hello all i am new to this forum and aslo new to rving. i purchased a like new 2002 newmar moutian aire gas motorhome. it has 15000 miles on it i have been completely thought iit. shocks batteries tires, alaignment. have had the complete motorhome gone thu. hrer is the issue. at 54 to about 58 mph. there is a vibration. can feel it in stearing wheel seat gas petal you also feel it in the passenger seat. we have been through all the items that could cause the vibration. tires balance front end u joints harmonic balancer to no avail. now i have been told that it might be the driveshafts may need to be balanced, or the flywheel may have lose a weight. any input. ps i thought that flywheels were drilled to balance then. any input would be welcome. thanks doug
Try driving it at the same rpm in a lower gear that equals your rpm condition of 54/58 in high gear. If you get the vibs at the same rpm but less speed it's engine related. If you don't then take it up to 54/58 in the lower gear. Assuming the vib returns that would prove the problem is speed related. meaning driveshaft, wheels, tires, rotors are suspect.

I would have someone elsewhere in the coach at speed and see if it is present, better, or worse towards the rear (I know, I know, some risk, but that is what I would do).
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Old 11-11-2012, 11:38 AM   #9
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Try driving it at the same rpm in a lower gear that equals your rpm condition of 54/58 in high gear. If you get the vibs at the same rpm but less speed it's engine related. If you don't then take it up to 54/58 in the lower gear. Assuming the vib returns that would prove the problem is speed related. meaning driveshaft, wheels, tires, rotors are suspect.

I would have someone elsewhere in the coach at speed and see if it is present, better, or worse towards the rear (I know, I know, some risk, but that is what I would do).
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Old 11-11-2012, 11:45 AM   #10
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Pull the drive shafts and take to a driveline rebuilder. They will be able to spin in a lathe and add balance weights. Also check the U joints and make sure they are in time.
A lot of people don't believe there is any such thing as U joint timing. I guarantee you there is! If the joints are out of phase, you'll get vibration. After a while, a yoke or something else will break.
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Old 11-11-2012, 12:18 PM   #11
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A lot of people don't believe there is any such thing as U joint timing. I guarantee you there is! If the joints are out of phase, you'll get vibration. After a while, a yoke or something else will break.

Absolutely
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Old 11-11-2012, 12:21 PM   #12
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A lot of people don't believe there is any such thing as U joint timing. I guarantee you there is! If the joints are out of phase, you'll get vibration. After a while, a yoke or something else will break.
That is a good point. This can happen if the driveline was removed and put back on with the yokes not lined up.
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Old 11-11-2012, 12:28 PM   #13
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If it has a two piece drive shaft then the center support bearing should be checked too.
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Old 11-11-2012, 12:32 PM   #14
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That is a good point. This can happen if the driveline was removed and put back on with the yokes not lined up.
That is true but with that problem it will complain at most any and all speeds.
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