Mechanic trying to fob me off?
Discussion
Quick advice needed;
Took car to a reputable brand specialist on advice that the propshaft bearing was worn and needed replacing.
The car was driving fine before but I like to keep on top of maintenance.
After the work was done, I immediately noticed vibration from the rear (driven wheels) on anything other than very light acceleration.
Took car back to check it was assembled correctly, only to be told it's likely the tyres (half worn Pirelli p zeros). I'm sensing BS as the car drove without vibration prior to the work.
Would perhaps putting the two rear wheels on different sides cause an issue? Just trying to think whether there's any logic in their argument or whether I've got a fight on my hands.
Took car to a reputable brand specialist on advice that the propshaft bearing was worn and needed replacing.
The car was driving fine before but I like to keep on top of maintenance.
After the work was done, I immediately noticed vibration from the rear (driven wheels) on anything other than very light acceleration.
Took car back to check it was assembled correctly, only to be told it's likely the tyres (half worn Pirelli p zeros). I'm sensing BS as the car drove without vibration prior to the work.
Would perhaps putting the two rear wheels on different sides cause an issue? Just trying to think whether there's any logic in their argument or whether I've got a fight on my hands.
rallycross said:
It’s not been put back together right or used wrong prop bearing
Yep, prop out of balance perhaps, if the two halves were not marked up (iirc they are weighted) or the wrong bearing as you say and it's putting stress on something... Or... They jacked the car up on a suspension component and bent it.Or it's a coincidence.
Depends how bad the vibration is really, and when it occurs. Prop imbalance caused by duff centre bearing tends to present as a wobble underneath the car when accelerating hard from a standstill. Wobble felt in drivers seat at motorway speeds could be rear wheel balance. If it's wobbling all the time it may be obvious to someone who knows what to look for, as to what the fault is. E.g. bent suspension arm.
HertsBiker said:
If the tyre sizes are the same front and rear, why not swap and see if the problem moves (tyres) or stays (mechanical issue).
Staggered tyre sizes so can't do that unfortunately.Also weird the problem didn't exist before. I just wondered whether putting the left wheel on the right side and vice versa might have had an impact. The tyres aren't directional, bit may have worn in a certain direction over the years?
bmwmike said:
Yep, prop out of balance perhaps, if the two halves were not marked up (iirc they are weighted) or the wrong bearing as you say and it's putting stress on something... Or... They jacked the car up on a suspension component and bent it.
Or it's a coincidence.
Depends how bad the vibration is really, and when it occurs. Prop imbalance caused by duff centre bearing tends to present as a wobble underneath the car when accelerating hard from a standstill. Wobble felt in drivers seat at motorway speeds could be rear wheel balance. If it's wobbling all the time it may be obvious to someone who knows what to look for, as to what the fault is. E.g. bent suspension arm.
Thanks for the feedback.Or it's a coincidence.
Depends how bad the vibration is really, and when it occurs. Prop imbalance caused by duff centre bearing tends to present as a wobble underneath the car when accelerating hard from a standstill. Wobble felt in drivers seat at motorway speeds could be rear wheel balance. If it's wobbling all the time it may be obvious to someone who knows what to look for, as to what the fault is. E.g. bent suspension arm.
The vibration can be felt when cruising above 30/40mph, and occurs most when accelerating with more than about 15-20% throttle.
Does that sound propshaft related?
Sounds a lot light prop vibration to me, as someone currently chasing the issue on a 20yo bmw.
Options include
- Incorrect, damaged, miss-aligned, or otherwise problematic installation of the centre bearing.
- Incorrect alignment of the front coupling, typically a rubber giubo, including worn centre bush.
- Propshaft split without marking, and hence now together with the wrong splines, so unbalanced.
I would take it back and say its not right, and consider having a new front coupling and bush installed at the same time.
Options include
- Incorrect, damaged, miss-aligned, or otherwise problematic installation of the centre bearing.
- Incorrect alignment of the front coupling, typically a rubber giubo, including worn centre bush.
- Propshaft split without marking, and hence now together with the wrong splines, so unbalanced.
I would take it back and say its not right, and consider having a new front coupling and bush installed at the same time.
motco said:
The clue should be the frequency of the vibration as the propshaft will rotate at between 3 and 4 times faster than the wheels. If you can sense the frequency is suspiciously high for wheel rotation speed then odds-on it is the propshaft.
Yeah, you don't really get wheel vibration at 30mph, and it isnt dependant on how much power you put down,Once I get to the bottom of whats causing mine, I'll let you know!
Thanks everyone for the help.
To put a conclusion to this, had to chase the garage a bit, however when they looked at things again they found that they had not pressed one of the new propshaft bearings in properly.
Car now drives fine again. Yet another disappointing mechanic experience to add to a long list
To put a conclusion to this, had to chase the garage a bit, however when they looked at things again they found that they had not pressed one of the new propshaft bearings in properly.
Car now drives fine again. Yet another disappointing mechanic experience to add to a long list
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