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Posted

Hi you guys, this is my first post. The car belongs to a friend, the milage is 120K.

The problem, which has only just started, is a heavy vibration felt mostly through the gear lever, but also through the car body. It appears during a fairly fast run after the everything has warmed up, it seems to be more noticable in 3rd. and 4th. less so in 5th. vibration vanishes on over-run.

front wheels recently re-balanced, no vibration through steering wheel.

Engine starts ok from cold, and settles down to a steady tickover no excessive vibration when cold, doesn't appear to be any notable loss of engine power.

 

Gearbox mountings seem tight, belt tensioner bearing and carrier recently replaced, and that's about it. We're both retired engineers, and it's got us both scratching our heads. Has anyone else had, or heard of a similar problem? any suggestions would be gratefully received.

 

car

Posted

sorry DickieG, should have entered this query in the Xantia section

When you say "could be the drive shaft", do you mean bent? balance, bearing? tightness?

 

regards

car

Posted

Something that Xantia's are prone to is driveshafts being out of balance which causes a vibration when under power although its normally felt at lower speeds when accelerating. I believe that its due to a problem with the inner joint being 'out of true'.

 

I'd try putting the front of the car on axle stands then use an assistant to 'drive' the car in gear whilst observing the driveshafts, particularly the inner joints. Look for any wayward movement.

Posted
we had a c5 with similar fault a few months ago. started with wheel balance then drive shafts. no diffrent. then gearbox. just the same. then went for fly wheel. it wasnt that. then fit a new engine and guess what. still the same. turned out to be the off side driveshaft carrier bearing. worth checking.
Posted

Hi DickieG and iannez, many thanks for the replies.

 

The problem is definitely worse under acceleration and load. Will investigate your suggestions and come back to you after the hols.

 

All the best for the coming season,

 

Regards,

 

car

  • 3 weeks later...
Posted

Hi DickieG and iannez, many thanks for the replies.

 

The problem is definitely worse under acceleration and load. Will investigate your suggestions and come back to you after the hols.

 

All the best for the coming season,

 

Regards,

 

car

Posted

To DickieG and iannez.

 

I am replying as promised after the hols. You were spot-on with your diagnosis; the centre carrier bearing on the drive shaft was worn. problem solved. Many thank for your help and rapid replies.

 

car

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