Technical Vibration after rear lower engine mount and exhaust change

[brightie1]

Hi all,
This relates to a 2007 Panda 1.1.
Took it in today for a new mid and rear section of the exhaust to be fitted. Whilst accessible with the exhaust off, I got them to fit a new bone shaped rear lower engine mount.
Watched the guy do it and it was done without supporting the engine, despite me telling them that this was required. There seemed to be no great difficulty fitting it so I assume that things lined up and the engine didn't drop much. The bolts weren't torqued up but the guy put a fair amount of welly into manually tightening them.
There is now a period of vibration that comes and goes when accelerating that wasn't there before. Its not severe but can be felt through the seat. I guess it could be the exhaust or the engine mount.
My question is, has anybody got any thoughts about the likely cause? I'm wondering if the engine being supported only by the remaining mounts might have finished them off? They probably need replacing after 18 years anyway.
Many thanks.
Ian

 

[ZaphodB]

I think perhaps you've answered your own question

Whilst generally some mounts deteriorate faster than others , these are 18 years old.

As they've only just done the job maybe get them to put it back up on the lift and see if there's anything obvious first.

 

[cooperman]

Worth doing all 3 if you can it’s a fairly simple job, the vibration you are feeling is more then likely the new mount actually working correctly.
I’ve replaced all mine and when I fitted the power flex insert into the gearbox mount there is now a very noticeable vibration.

 

[koalar]

Why was the dog bone being changed in the first place


Stop on an incline, and reverse uphill by slowly lift the clutch, does it shack violently

You really need to get under it and see if the exhaust is catching, common after a change


Seeing it was done at a garage I'd be tempted to take it back

It's fine to replace the dog and bone without supporting the engine or gearbox, it only stops the twisting under acceleration and braking


Are we talking, vibration, clunking or banging

 

[brightie1]

Why was the dog bone being changed in the first place


Stop on an incline, and reverse uphill by slowly lift the clutch, does it shack violently

You really need to get under it and see if the exhaust is catching, common after a change


Seeing it was done at a garage I'd be tempted to take it back

It's fine to replace the dog and bone without supporting the engine or gearbox, it only stops the twisting under acceleration and braking


Are we talking, vibration, clunking or banging

Thanks all for your replies so far. I got the dog bone changed because the opportunity was there with the exhaust being off. Bit like doing the water pump when a cam belt is changed.
Its just vibration between maybe 2500 and 3000 revs, no clonks or bangs.
I did get transmission shunt before though and its very jerky on overrun when cold. Thought that changing the dog bone may assist. Its worse on really cold mornings so will see if its improved first thing in the morning. Have ordered the other engine mounts.

 

[koalar]

Thanks all for your replies so far. I got the dog bone changed because the opportunity was there with the exhaust being off. Bit like doing the water pump when a cam belt is changed.
Its just vibration between maybe 2500 and 3000 revs, no clonks or bangs.
I did get transmission shunt before though and its very jerky on overrun when cold. Thought that changing the dog bone may assist. Its worse on really cold mornings so will see if its improved first thing in the morning. Have ordered the other engine mounts.

Strange one

2 wheel drive or 4X4

 

[brightie1]

2 wheel drive.

 

[koalar]

2 wheel drive.

Feel it under the seat

Vibration and only at certain rev range

Wasn't there before the exhaust was changed

Without looking at anything, the exhaust touching something sounds the most likely

 

[brightie1]

Many thanks, I'll have a good feel around the exhaust for anything touching.

 

[brightie1]

Many thanks, I'll have a good feel around the exhaust for anything touching.

Can't see the exhaust touching anywhere. Really can't see how the dog bone engine mount can have been installed incorrectly either.

Replaced the R/H engine mount but couldn't undo the central bolt on the L/H one. Freeing agent applied. Break bar used without any joy.
Its getting to the point where Im concerned it may shear off.
Any thoughts anybody please? Is it likely to shear if I extend the break bar leverage further?
Many thanks

 

[ZaphodB]

Let the stuff soak in over a week, and reapply daily

 

[DaveMcT]

Mrs Dave's 1.2 replacement exhaust had a rattle at the back that took me weeks to find. The shock absorber bracket was hitting the silencer box edge flange. Totally invisible (almost) when jacked up on stands.

 

[DTanner]

Any thoughts anybody please?

I don't know how vigorous you have been, but I would lie down at the mid point of the car, grab the central exhaust pipe (when it is cool) and give it a good wrench from side to side. Same with the silencer.
I fitted an exhaust on mine a couple of years ago and there was a vibration and noise. Everything looked fine, nothing was touching but when I started the engine the noise/vibration started.
I realised that the fitting was slightly out of shape and the prong that holds the rubber hanger on the central exhaust section was hitting the car body.
The main point I am trying to make is that an exhaust moves around a lot when driving (and accelerating) and everything might seem fine when the car is stationary.
Pull the exhaust around and see if you can cause a collision.

 

[ZaphodB]

I don't know how vigorous you have been, but I would lie down at the mid point of the car, grab the central exhaust pipe (when it is cool) and give it a good wrench from side to side. Same with the silencer.

This ^^

... and see if you can cause a collision.

Will that be because of his feet sticking out during the test ....

 

[koalar]

Needs to go back to the garage, before there's too long of a gap, it's already a week

Wasn't there before they did the work

They probably caused it, let them sort it