Member Since: 05 May 2018
Location: Alberta
Posts: 37
Vibration After installing new rear prop shaft
My old rear prop shaft has some play in the CV joint and make some clunk noise, I installed a BritPart GKN rear prop shaft. Then the disco starts to have vibration from about 50MPH , and gets really bad after 65 MPH , was thinking maybe some imbalance from transfercase and rear differential? So I rotated the prop shaft and remount it to the transfer case flange, did this several times, but not too much difference... should I rotate the shaft 90 degrees and remount the rear flange to differential? Or it is just a faulty new GKN prop shaft from BritPart... if so, maybe I would send it to a balancing shop instead of returning it to UK from CANADA. Any opinions? Dose the relative angle between transfer case flange to diff flange matter that much?
31st May 2019 10:59 am
Bardley
Member Since: 02 May 2018
Location: Hertfordshire
Posts: 442
This sounds like it is not the propshaft, and your issue lies elsewhere. What mileage do you have regd?
Does it happen every time you get to the same speed, same gear? Same engine or gearbox temp? Vibration can come from wheel imbalance, bearings, gearbox and even suspension bush faults.
Try a different gear and see if you get the same.2011 MY D4 HSE
Previously 2001 D2 TD5, 1996 D1 300Tdi, 1985 90 2.2 petrol.
Bikes! KTM, BMW, British, Classics and others.
31st May 2019 12:57 pm
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4405
To answer your last question, no, the relative angles of the diff & transfer flanges wont make any difference. The propshaft should be a balanced rotating assembly in it's own right.
If the vibration didn't start until you fitted the new prop, you should take it to be checked for balance. I'm sure you don't want to be posting it back to the UK!Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
If the vibration was not there before you fitted the new prop then it has to be the a faulty new prop, I would get it balanced at least to see if that is the fault.
Did you test the joints on both ends for stiffness or play before you fitted it.
Flack
31st May 2019 1:10 pm
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
It could have been dropped or bent in transit
31st May 2019 3:28 pm
eightfoot
Member Since: 12 Apr 2015
Location: sunny essex
Posts: 762
or it could just be you didn't clean the flange correctly or the flange isn't seated in the recess correctly
needs to come off checked and refittedplease excuse any grammer/punctuation mistakes,i'm thick,thankyou
current vehicles 2005 d3 2013 d4
31st May 2019 3:32 pm
RickyAtHere
Member Since: 05 May 2018
Location: Alberta
Posts: 37
Thanks for all the helps! 120K miles. It did not vibrate before change. I can really feel the vibration... really strong at highway speed (70 MPH), the seat is giving me massage at highway speed... vibration is wheel speed related and only a little bit load related. The rest of the disco are fine. I checked all the CV and UJ before installing, they all feels right. I did clean the flanges and apply a little bit anti-seize. I didn’t suspect the prop shaft at first and the manual says marking and keeping the relative angle of two flanges, that’s how I spent hours to rotate and remount...
31st May 2019 5:16 pm
ronald.soak
Member Since: 29 Apr 2008
Location: London
Posts: 516
Although the rear flange can be rotated 90 degrees, and the bolt holes lined up, the adjacent sides of the flange have a different shape. In service a crust of corrosion builds up on the areas of the differential flange not covered by the propshaft flange. It is advisable to fit a replacement propshaft with the same alignment as the original or else you are torquing down onto a non flat surface. Easily done under a dark car with bright sunlight in your field of vision.
I would suggest checking and if in the original alignment keeping it like that.
I also prefer to tighten opposing pairs of bolts partially in turn before final torquing.
Good luck
31st May 2019 5:48 pm
RickyAtHere
Member Since: 05 May 2018
Location: Alberta
Posts: 37
Yes, I did notice the difference on the rear flange, I aligned the rust pattern with the prop shaft and tighten the bolts little by little in a cross-pattern... I checked the rear mounting twice, I cannot see a gap, it seated pretty well.
31st May 2019 6:29 pm
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1783
Did it come with the new centre bearing or did you replace that. You could check rotation alignment with a clock gauge and see it there is any run out prior to taking it off again.
1st Jun 2019 6:13 am
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8119
Put the old prop shaft back on and see if it still does it, the new one will have to come off anyway by the sounds of it. UJs can usually be renovated It can when others can't,
It will when others won't,
It goes where others don't.
1st Jun 2019 9:40 am
RickyAtHere
Member Since: 05 May 2018
Location: Alberta
Posts: 37
I took the new shaft out and put the old one back in, everything become so quiet again except for the clunk noise when accelerating from still... I really should use a dial indicator to check the runout, now I may need to send the new one to a balancing shop. The vibration from the new shaft was really bad and it shouldn't be a vibration from resonating with the rest of the drivetrain, it really feels like the balance is off as it's getting stronger as speed goes up. I checked out the UJ and CVs of the new shaft again when I took it off, the UJ feels really OK but the CVs especially the middle one feels a bit stiff? is it normal to a new shaft? the CV of the half shaft feels really smooth and free in my memory... Can a stiff CV cause vibration? I could not find a missing weight on the new shaft. The new prop shaft is manufactured by GKN.
2nd Jun 2019 8:38 am
eightfoot
Member Since: 12 Apr 2015
Location: sunny essex
Posts: 762
just take it back to the seller and tell them you want a good one not a out of balance oneplease excuse any grammer/punctuation mistakes,i'm thick,thankyou
current vehicles 2005 d3 2013 d4
2nd Jun 2019 9:42 am
RickyAtHere
Member Since: 05 May 2018
Location: Alberta
Posts: 37
I brought it from a UK seller, and I am in CANADA... Send it back would cost a lot on shipping. still negotiating with the seller.
I checked the UJ again, one axle is smooth, but the other axle is tight and stiff, I can even feel slight binding at a certain angle... could this be the cause of vibration?
8th Jun 2019 1:22 am
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1783
Most uni joints are tight but smooth so one that locks can be a problem. There must be a place in Alberta that could check it for you - obviously a cost would be involved. Would the UK company send you a replacement joint for you to install. Alternately, maybe they will pay return shipping.
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