Strange continual vibration

[MRGT]

I'm not sure if its just me but since getting my car back from having the new water pump and belts it seems to have devolped a vibration throughout the whole vehicle which I'm pretty sure wasn't there before. When cold the whole car seems to shudder whilst idling but once warmed up it settles down to a gentle but fast, vibration. She drive's fine but there is now a constant squeaking from various bits of the dash which definately weren't there before. I know its a bit of an obsure description but it feels almost as though your driving along whilst sat on top of a washing machine on a very fast ( but refined) spin cycle ! []

 

[chas3.2]

Take the car back and have them check the balance shaft timing could be this.

Charles

 

[peanut]

ORIGINAL: Charles Marsland

Take the car back and have them check the balance shaft timing could be this.

Charles

Absolutely +1 . It sounds like they put the balance shafts back wrong. i believe I read somewhere that they need to be 180 degrees out of phase to balance each other out ? but definitely has to be that as Charles suggests. What is the engine RPM on idle ?

 

[colin944]

It is possible to put the pullies on the balance shafts on back to front. That would knock out the timming of them and give you a vibration.

 

[MRGT]

ORIGINAL: peanut

What is the engine RPM on idle ?

Thanks for the quick replies chaps. It settles at around 900 rpm.

Howard

 

[zcacogp]

Wot Chaz Sed. (Sorry Charles! [])

And do it soon. Engine vibration can lead to a fractured oil pick-up pipe, which can lead to no end of nasties.


Oli.

 

[alwigley]

Its pretty easier to remove the engine front cover, turn the engine to TDC and then check to see if the balance shafts are correctly set. I think you can see both balance shaft sprockets with just the main cover off - as before, don't leave it....... If they changed the water pump and belts, they should not have removed the balance shafts, so most likely scenario is they are reset slightly out of position.

 

[zcacogp]

Nope - balance shaft pulleys need to come off to do the waterpump.

Getting access to the two pulleys with only the top cover off is pretty tricky as well.

If the vibration is new as a result of the work that was done then the car needs to go back to be checked really. It's what you paid for (in part).


Oli.

 

[chas3.2]

ORIGINAL: MRGT


I'm not sure if its just me but since getting my car back from having the new water pump and belts it seems to have devolped a vibration throughout the whole vehicle which I'm pretty sure wasn't there before. When cold the whole car seems to shudder whilst idling but once warmed up it settles down to a gentle but fast, vibration. She drive's fine but there is now a constant squeaking from various bits of the dash which definately weren't there before.  I know its a bit of an obsure description but it feels almost as though your driving along whilst sat on top of a washing machine on a very fast ( but refined) spin cycle ! []

Hi if this was a none Porsche specialist he will need to know how to set up the balance shalf gears to the balance shafts.
if they do not know ask them to ring me and i will help them

Charles

 

[Eldavo]

ORIGINAL: zcacogp

Nope - balance shaft pulleys need to come off to do the waterpump.

Really? Not in the dirty North they don't!

 

[MRGT]

Charles, thanks for the offer of help.

Took her back this morning, (armed with a copy of Clarkes Garage manual), 2 hours later and she's sorted, now running as smooth as silk []

Many thanks to you all

Howard

 

[zcacogp]

Gosh. Can't explain that. Now I'm confused!

When I did the pump on my S2, the rear cover wouldn't fit over the pulleys on the balance shafts. It was close, but wouldn't quite go. Have you had your rear cover modified to fit over the pulleys? (It wouldn't be hard, and would be a sensible modification.)

As an aside, Clarks Garage also says you need to remove the balance shaft pulleys (sprockets) to do the job - point 5, here:

http://www.clarks-garage.com/shop-manual/cool-07.htm


Oli.

ETA: Howard, well done - that's the right result. Glad to hear it.

 

[peanut]

ORIGINAL: MRGT

Charles, thanks for the offer of help.

Took her back this morning, (armed with a copy of Clarkes Garage manual), 2 hours later and she's sorted, now running as smooth as silk []

Many thanks to you all

Howard

excellent result ! Lucky you are so observant. I wonder how many other owners are driving around with engines that vibrate because they wern't assembled correctly.!

 

[Eldavo]

ORIGINAL: zcacogp

Gosh. Can't explain that. Now I'm confused!

When I did the pump on my S2, the rear cover wouldn't fit over the pulleys on the balance shafts. It was close, but wouldn't quite go. Have you had your rear cover modified to fit over the pulleys? (It wouldn't be hard, and would be a sensible modification.)

As an aside, Clarks Garage also says you need to remove the balance shaft pulleys (sprockets) to do the job - point 5, here:

http://www.clarks-garage.com/shop-manual/cool-07.htm


Oli.

ETA: Howard, well done - that's the right result. Glad to hear it.

You can remove the cover and widen the holes so that you can slip the rear cover over the pulleys, that is the sensible modification when removing it the first time.

The ghetto method that someone has employed previously on mine is to make a cut in the rear cover above the top balance shaft pulley, therefore you can twist the rear cover slightly and pull it over the top pulley as shown in the picture. This lets you do the water pump without removing the rear cover, balance pulleys and crank pulley and you don;t need a flywheel lock either.