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Technical Rumbling

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Technical Rumbling

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Graham2018

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I recently had to have my prop-shaft bearing done on my fiat panda 2013 4x4 . Ever since there seems to be a slight
rumble when driving the car . I have put this down to the fact that the garage had to take the prop-shaft off to fit the new
bearing, and its been like that since . However driving up the M5 today the rumbling/vibrating from under the car suddenly
got bad, almost slowing the car and lasted for a few miles but clearly not great . However on the way back it was fine
with a slight rumbling feeling but didn't want to go below 70, so running fine . I'me putting this down to the new bearing,
but this was happening before it was fitted . I'me wondering whether the fact the previous bearing bearing was split,
whether its done any damage ?.......anyone any ideas ?
 
Graham2018 said:
I recently had to have my prop-shaft bearing done on my fiat panda 2013 4x4 . Ever since there seems to be a slight
rumble when driving the car . I have put this down to the fact that the garage had to take the prop-shaft off to fit the new
bearing, and its been like that since . However driving up the M5 today the rumbling/vibrating from under the car suddenly
got bad, almost slowing the car and lasted for a few miles but clearly not great . However on the way back it was fine
with a slight rumbling feeling but didn't want to go below 70, so running fine . I'me putting this down to the new bearing,
but this was happening before it was fitted . I'me wondering whether the fact the previous bearing bearing was split,
whether its done any damage ?.......anyone any ideas ?
Click to expand...
It could be a few things…
Is the rumble speed dependant? The higher the gear the faster the shaft spins. If its out of balance there may be a speed where the vibration reduces
The propshaft is balanced as an assembly. If the garage didn’t carefully mark the orientation if each joint before disassembly there is a chance they have reassembled it in a different orientation
If you paid someone to do the job and there is an issue I would take the car back to them, describe the problem and get them to drive it with you
 
The centre bearing needs to be exactly in the same place as the original. Hopefully they measured this accurately. If a little forward or back, the prop will be forever fighting itself.
I belive the two halves of the prop have to be separated to replace the cente bearing, as is normal with this sort of job. This is usually a splined joint, and will fit on any spline. However, the two spider joints at each end need to be aligned. They are not constant velocity joints, so need to be opposite to each other to cancel the speed variation. One spline out will change this orientation, and cause such vibration. If the splines are an uneven number, the two halves might be 180 degrees out.
Newer models have a viscous coupling at the rear. There have been a few threads on here about those failing. One guy found a prop specialist that repaired his. Will need a search to find the thread.
 
portland_bill said:
Newer models have a viscous coupling at the rear. There have been a few threads on here about those failing. One guy found a prop specialist that repaired his. Will need a search to find the thread.
Click to expand...
I'm not sure this is the case. Maybe you are referring to the clutch that engages the rear wheel drive in the front of the rear diff?
 
Thanks for the info . The car is going back on 8th April for its MOT. I'me gonna get the garage to check the propshaft . I am going
to get them to grease all the moving parts and the bearing . Hopefully that might improve things . I've had the car 7 years in may
and its been an absolutely brilliant car .
 
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