[928uk] Thrust Bearing Failure

[marton]

Hi Graham

So far as I know these big sprockets lose their surface hardening as 
regular wear & tear; not linked to belt tightness.

When I changed my cam belt I had to change these sprockets & the oil 
gear - I could get a non-aluminium version of this one.

Good Luck


On 19/02/2012 19:35, go928 wrote:
> Hi Marton,
> The big sprockets.
> Regards.
> Graham.
>
>     -----Original Message-----
>     *From:* 928uk-bounces at lists.928.org.uk
>     [mailto:928uk-bounces at lists.928.org.uk] *On Behalf Of *marton
>     *Sent:* 19 February 2012 17:52
>     *To:* 928uk at lists.928.org.uk
>     *Subject:* Re: [928uk] Thrust Bearing Failure
>
>     Very sorry to hear this.
>
>     I think it will be hard to go after the firm because Porsche never
>     really admitted the flex plate was the cause of the TBF so where
>     is your expert witness?
>
>     About cam belt rollers are damaged due to overtensioning of the
>     belt - which rollers do you mean exactly?
>
>
>
>      "On 19/02/2012 18:19, go928 wrote:
>>
>>     Late last year my S4 auto suffered terminal tbf - the engine is
>>     probably a write-off.
>>
>>     Briefly, I've owned the car about 10 years, covering about 6,000
>>     miles a year.  She has 130k on the clock.  Throughout the last 10
>>     years she has been maintained and serviced annually by the same
>>     firm and a flex plate check has been specified at each service. 
>>     Over the last couple of years I have had a series of problems
>>     with difficulty starting, stalling and uneven running.  She has
>>     been back to the specialist on a number of occasions and fuel
>>     pump, MAF and ISV among other things have all been replaced. 
>>     Each time the immediate problem has been resolved, but the car
>>     was not running quite right, although it was hard to say
>>     precisely why.  I now suspect this was early symptoms of the
>>     pending failure.
>>
>>     My view is that the Porsche specialists who look after the car
>>     should bear some responsibility, but they do not agree and have
>>     washed their hands of my situation.  Maybe I am not being as
>>     objective as I should be so I would welcome any thoughts.
>>
>>     My reasons for blaming the firm who looked after the car are:
>>
>>       * Everything I have read about tbf seems to suggest it is
>>         unheard of where the flex plate has been checked and released
>>         regularly.
>>       * The engine finally seized only about 2,000 miles after the
>>         last service/flex plate check.
>>       * When the tbf was diagnosed (by a different firm) the pinch
>>         bolt was only finger tight.
>>       * The firm admit that they do not change the pinch bolt when
>>         they check the flex plate.
>>       * The cam belt rollers are damaged due to overtensioning of the
>>         belt.  (As they have changed the cambelt twice since I
>>         acquired the car, to my mind, even if they didn't cause the
>>         damage they should have spotted it and changed the rollers).
>>       * ATF in the diff.
>>
>>     The last two points have no direct bearing (ha ha) on the thrust
>>     bearing failure, but do indicate a questionable level of care.
>>
>>     My questions:
>>
>>       * Is it fair to pursue the firm for a contribution towards the
>>         cost or should I accept (as they claim) that the thrust
>>         bearing can fail at any time, even if the flex plate is
>>         regularly checked?
>>       * If I do have a claim, any thoughts on how best to get them to
>>         do the decent thing?  I will take them to court if necessary
>>         but would prefer to avoid all the hassle if possible.
>>
>>     Thanks in advance.
>>
>>     Graham
>>     (91 S4 auto)
>>
>>
>>
>>     _______________________________________________
>>     928uk mailing list
>>     928uk at lists.928.org.uk
>>     http://lists.928.org.uk/cgi-bin/mailman/listinfo/928uk
>
>
>     -- 
>     Rheinstrasse 2
>     8193 Eglisau
>     Switzerland
>
>     +41 44 867 4074
>


-- 
Rheinstrasse 2
8193 Eglisau
Switzerland

+41 44 867 4074

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