07-06-2016, 06:11 AM
(This post was last modified: 07-06-2016, 06:12 AM by MitchellR32.)
So after 9days of being off the road again the vibration has been sourced! To find it my mechanic went round the houses, 3 times!
First the wheels were re balanced, sure enough they were not balanced properly at the refurbishers. This wasn't the cause of the vibration.
Then came the time to truly eliminate the back wheels and drive, so off came the rear subframe and prop shaft. Again a problem was found in that the rubber donut on the prop shaft was cracked! A test drive without this though only showed that the vibration was still there.
Now only the front end was causing the vibration. Engine mounts were tested and showed a little play, not enough to cause the shocking amount of vibration. A run out test on the discs and drive shafts were carried out, very small amount on the offside shaft, again not enough to cause a problem which would have been there the whole time.
A trip to a gearbox specialist proved unproductive as he eliminated the possibility of it being a transfer box issue.
All seemed hopeless when after exchanging the front driveshafts off of his own mk5 golf that the problem was still grinning at him. As a final ditch attempt to find the bug they removed the front brake discs. PROBLEM FOUND! There is no warping or damage noticeable, but once removed all is fine and absolutely no vibration. Conclusion, your guess is as good as ours. Long and short of it is that I will need to replace the front discs and pads for the second time in a year.
I've never seen my mechanic so confounded. The upside is that this thorough health check has revealed some potentially harmful issues, such as the prop shaft donut which has now been replaced. The dog bone mount had serious amounts of play, also changed.
Looking forward to getting it back so I can make plans for a change in the front braking system.
First the wheels were re balanced, sure enough they were not balanced properly at the refurbishers. This wasn't the cause of the vibration.
Then came the time to truly eliminate the back wheels and drive, so off came the rear subframe and prop shaft. Again a problem was found in that the rubber donut on the prop shaft was cracked! A test drive without this though only showed that the vibration was still there.
Now only the front end was causing the vibration. Engine mounts were tested and showed a little play, not enough to cause the shocking amount of vibration. A run out test on the discs and drive shafts were carried out, very small amount on the offside shaft, again not enough to cause a problem which would have been there the whole time.
A trip to a gearbox specialist proved unproductive as he eliminated the possibility of it being a transfer box issue.
All seemed hopeless when after exchanging the front driveshafts off of his own mk5 golf that the problem was still grinning at him. As a final ditch attempt to find the bug they removed the front brake discs. PROBLEM FOUND! There is no warping or damage noticeable, but once removed all is fine and absolutely no vibration. Conclusion, your guess is as good as ours. Long and short of it is that I will need to replace the front discs and pads for the second time in a year.
I've never seen my mechanic so confounded. The upside is that this thorough health check has revealed some potentially harmful issues, such as the prop shaft donut which has now been replaced. The dog bone mount had serious amounts of play, also changed.
Looking forward to getting it back so I can make plans for a change in the front braking system.