hubert FRACKOWIAK Posted February 10, 2020 Share Posted February 10, 2020 High everybody , I' m writing you from France . I am the owner of a very nice 66 Rivi I have restaured 7 years ago .. I have a new trouble with it , since I have changed the Universal u joint and the propeller shaft bearing and support . I can feel a vibration , not in the wheel but in the seat . This vibration appears at 30 mph and disappears at 35. It is present in all circumstances, in charge, in deceleration, in neutral. Constant velocity kit are both new , I have torque all bolt at good value , I check the yoke phase ... At other speed , it is perfect . Any idea ? Link to comment Share on other sites More sharing options...
FLYER15015 Posted February 10, 2020 Share Posted February 10, 2020 I would have the shaft rebalanced as my first fix. Mike in Colorado Link to comment Share on other sites More sharing options...
hubert FRACKOWIAK Posted February 10, 2020 Author Share Posted February 10, 2020 I think so too but I don't know why, it is very difficult to find a workshop in France that does this job. Thank you for answering Link to comment Share on other sites More sharing options...
hubert FRACKOWIAK Posted February 10, 2020 Author Share Posted February 10, 2020 sorry , I don't know why but it is very hard to find in France a workshop able to do this job . Don't you think that if it was a balancing trouble , the shaft would vibrate at almost all speed ? Link to comment Share on other sites More sharing options...
PFitz Posted February 10, 2020 Share Posted February 10, 2020 Auto repairs shops rarely get involved with drive shaft balancing. But truck repair shops sometimes have the equipment to balance driveshafts. Or, they know of driveshaft shops that can do the work. Paul Link to comment Share on other sites More sharing options...
keiser31 Posted February 10, 2020 Share Posted February 10, 2020 14 minutes ago, hubert FRACKOWIAK said: sorry , I don't know why but it is very hard to find in France a workshop able to do this job . Don't you think that if it was a balancing trouble , the shaft would vibrate at almost all speed ? Not uncommon to have a vibration at different speeds and not all speeds. Link to comment Share on other sites More sharing options...
Guest Posted February 10, 2020 Share Posted February 10, 2020 Did you get the U-joints "out of phase". Link to comment Share on other sites More sharing options...
hubert FRACKOWIAK Posted February 10, 2020 Author Share Posted February 10, 2020 33 minutes ago, Tinindian said: Did you get the U-joints "out of phase". Sorry , I don't understand , what do you mean ? Have the u joint an orientation ? Link to comment Share on other sites More sharing options...
hubert FRACKOWIAK Posted February 10, 2020 Author Share Posted February 10, 2020 1 hour ago, keiser31 said: Not uncommon to have a vibration at different speeds and not all speeds. Ok , I note . Thank you . Link to comment Share on other sites More sharing options...
hubert FRACKOWIAK Posted February 10, 2020 Author Share Posted February 10, 2020 1 hour ago, PFitz said: Auto repairs shops rarely get involved with drive shaft balancing. But truck repair shops sometimes have the equipment to balance driveshafts. Or, they know of driveshaft shops that can do the work. Paul Link to comment Share on other sites More sharing options...
hubert FRACKOWIAK Posted February 10, 2020 Author Share Posted February 10, 2020 1 hour ago, PFitz said: Auto repairs shops rarely get involved with drive shaft balancing. But truck repair shops sometimes have the equipment to balance driveshafts. Or, they know of driveshaft shops that can do the work. Paul Yes Paul , I will direct my research in this direction . Thank you . Link to comment Share on other sites More sharing options...
PFitz Posted February 10, 2020 Share Posted February 10, 2020 1 hour ago, hubert FRACKOWIAK said: Sorry , I don't understand , what do you mean ? Have the u joint an orientation ? An explanation of drive shaft universal joint phase. http://www.managedmobile.com/driveshaft-phasing-importance/ Paul Link to comment Share on other sites More sharing options...
nickelroadster Posted February 11, 2020 Share Posted February 11, 2020 There are not very many cars with driveshafts in France. Good luck at a truck place! Link to comment Share on other sites More sharing options...
Guest Posted February 11, 2020 Share Posted February 11, 2020 4 hours ago, PFitz said: An explanation of drive shaft universal joint phase. Thank you PFitz, you answered his query before I got back here. Link to comment Share on other sites More sharing options...
hubert FRACKOWIAK Posted February 11, 2020 Author Share Posted February 11, 2020 15 hours ago, PFitz said: An explanation of drive shaft universal joint phase. http://www.managedmobile.com/driveshaft-phasing-importance/ Paul Thank you , very interessant topic . Link to comment Share on other sites More sharing options...
Guest Posted February 11, 2020 Share Posted February 11, 2020 Even the best mechanic can get them out of phase occasionally. In the dealership where I worked in the 60's we had one man who only did u-joints. He did half a dozen or more every day and every few years he would mess up and get one out of phase. We only had one guy in the shop that had no comebacks (general mechanic with no papers who mic'd everything) and a tune up guy that only had one or two comebacks a year. Everyone else had up to 5% comebacks. Link to comment Share on other sites More sharing options...
PFitz Posted February 11, 2020 Share Posted February 11, 2020 1 hour ago, Tinindian said: Even the best mechanic can get them out of phase occasionally. In the dealership where I worked in the 60's we had one man who only did u-joints. He did half a dozen or more every day and every few years he would mess up and get one out of phase. We only had one guy in the shop that had no comebacks (general mechanic with no papers who mic'd everything) and a tune up guy that only had one or two comebacks a year. Everyone else had up to 5% comebacks. Or a drive shaft shop that welds a new yoke on out of phase with the yoke on the other end of the shaft. Paul. Link to comment Share on other sites More sharing options...
Jubilee Posted February 12, 2020 Share Posted February 12, 2020 Balance Masters makes Liguid mercury filled drive shaft balancers. Easy to install and reasonable. Usually cheaper than a shop balance. Never wear out. I think they go from 2” to 5-6” OD. I’m not connected with the company in anyway, just a satisfied customer. Used them in my trucking business for over 30 years. When I bought my first set of truck wheel balancers from them I asked about warranty. The claimed their product would outlive me. It looks like they may be right. Sons and Grandsons now have business now and first set of balancers still running. Link to comment Share on other sites More sharing options...
hubert FRACKOWIAK Posted February 16, 2020 Author Share Posted February 16, 2020 Thank you for answering ! On 2/12/2020 at 8:36 AM, Jubilee said: Balance Masters makes Liguid mercury filled drive shaft balancers. Easy to install and reasonable. Usually cheaper than a shop balance. Never wear out. I think they go from 2” to 5-6” OD. I’m not connected with the company in anyway, just a satisfied customer. Used them in my trucking business for over 30 years. When I bought my first set of truck wheel balancers from them I asked about warranty. The claimed their product would outlive me. It looks like they may be right. Sons and Grandsons now have business now and first set of balancers still running. Hey , I don't know this system . I ve seen their website . Does the system works on car driveshaft ? it seems to be reserved for truck ... Link to comment Share on other sites More sharing options...
hubert FRACKOWIAK Posted February 27, 2020 Author Share Posted February 27, 2020 Hy guys , some news of my drivesahft .. I suspected that the mechanic who had changed the five u joints had remove them with a hammer , because I saw discreet traces of blows on one of the two half shaft.. Using a hammer is not a problem to get out of the u joint, but you have to strike in the right place... So I dismantled it again and I found a guy who could check it with the comparator, and confirm to me that there is indeed one of the two half shaft that was bent. He was able to straighten it with the help of a press, and the vibration has now completely disappeared. Thank you all for your advice ! Hubert 2 Link to comment Share on other sites More sharing options...
PFitz Posted February 28, 2020 Share Posted February 28, 2020 Glad you found the problem and were able to correct it. And thank you for letting us know that. Too often we don't hear the end result. Paul Link to comment Share on other sites More sharing options...
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