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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7806
Location: Brighton


PostPosted: Sun Sep 15, 2019 4:26 pm    Post subject: Cayenne Transfer Box Failure Reply with quote

We have started to see several of these recently , this is a 2012 model .

Kinda figured we might as well have a look inside and see what's going on and i'm sure there will be someone on the forum that likes to see things in bits Very Happy

Various images of it apart and then partially stripped.

New clutch pack , in depth cleaning of parts then a forced regen to recalibrate the control unit / motor seems to have fixed this one .


Right click any image and select view in new tab ( chrome ) for a larger picture .
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baldguy
Hockenheim


Joined: 09 Nov 2010
Posts: 677
Location: Berkshire & London


PostPosted: Sun Sep 15, 2019 8:08 pm    Post subject: Reply with quote

Had mine done at 42k miles last year... disgusting that these let go even at this mileage... it has full OPC history...
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Pops
Silverstone


Joined: 15 Jul 2016
Posts: 116
Location: West Sussex


PostPosted: Mon Sep 16, 2019 3:45 pm    Post subject: Reply with quote

Interesting post Iain, thanks for the pictures and it is good to hear that you can repair these rather than replace!

What was the mileage of that vehicle and the condition of the transfer fluid which you drained?
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911TEL
Albert Park


Joined: 29 Oct 2007
Posts: 1547
Location: Inverness & Kazakhstan

2011 Porsche 997 Turbo S

PostPosted: Mon Sep 16, 2019 4:48 pm    Post subject: Reply with quote

This is quite a common failure .....Mine was changed at 30000 on my 2015 958......
I was told it’s a design fault of a badly routed breather pipe which allows water ingress in certain conditions ...
Mine was carried out under warranty but if not it’s a 4.5k job if it’s an OPC replacement....worrying costs but a good reason to keep the warranty going ...it may not be the only time it gets changed ...
I suspect it’s also due to uneven wear on tyres back to front re the rolling circumferences and the transfer box is the unit that synchronises the front / rear drive split ?

I’m prepared to see mine changed again ..

There are stories of vehicles in the US of A having 4 or 5 changes in the life of a Vehicle!

Frightening on a Porsche .....
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7806
Location: Brighton


PostPosted: Mon Sep 16, 2019 7:51 pm    Post subject: Reply with quote

This car had done approx 60K miles ..

It had a modified breather which was a problem on cars without this .. water ingress and oil don't mix well .

Circa £1500 - £2K for the above .. diagnosis of this fault isn't easy .. it feels similar to an engine running fault .

This seems to be more of a fault on the later cayennes than the earlier ones .

Incorrect tyres will have a significant impact on damage to diff / transfer box on a cayenne than a sports car ... no transfer box but you get what i mean .

N rated tyres .. must be the same per axle .

Oil was no where near due a change and was fine .
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EGTE
Imola


Joined: 06 Jul 2015
Posts: 855



PostPosted: Mon Dec 30, 2019 10:41 am    Post subject: Reply with quote

This is becoming yet another Porsche engineering plague.

Transfer box oils need replacing every 20K at most.
 
  
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easternjets
Watkins Glen


Joined: 29 Apr 2016
Posts: 2205
Location: Darlington


PostPosted: Mon Dec 30, 2019 12:27 pm    Post subject: Reply with quote

I've got a V6 TDi Touareg and after reading this I got a bit worried as my car has done 45k miles and never had the box fluid changed. My car went in for a service and also needed a replacement drivers side door wiring loom.
I asked if I could have the fluid in the box changed and I was told that the oil is good for the lifetime of the car but I told them I wanted it done regardless.
At first they couldn't get the oil so I bought some off fleabay that was genuine VW and they changed it for me and included it in the service.
I can't see why they can't just change it as part of a major service, the oil is only £30 and it takes minutes to do if you've got the underside stripped.
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7806
Location: Brighton


PostPosted: Mon Dec 30, 2019 6:22 pm    Post subject: Reply with quote

It depends to a degree which type of transfer box you have fitted .. this is more the " clever " type that seems to be affected although i have seen gen 1 boxes fail..

Different symptoms though .

With this type fitted then with a tester you can see the wear life of the oil and wear ( calculated as i understand it ) to the clutch pack and oil.

This check should be done with a tester on a service .

The unusual point is that none of the ones i've seen , only a few , have reached the interval that an oil change is warranted .

I can also say that a calibration done when the box is already showing driving faults does not work.

The one we have in atm .. the box is not a viable repair as it needs all bearings , clutch , chain and unfortunately one of the bearings has spun in the casing .. possible to repair but with the added items it's not realistic .
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Porkaholic
Spa-Francorchamps


Joined: 11 Jan 2009
Posts: 313
Location: Cornwall

2009 Porsche 997 Carrera 4S

PostPosted: Mon Dec 30, 2019 6:37 pm    Post subject: Reply with quote

Bit worrying if it the oil is fine, already has a breather pipe fitted and still getting failures. Inclined to keep warranty going, mine went after only about
14,000 miles and I've never used it for towing, ploughing or offroading!
Would be interesting to know the failure rate as a percentage so you can take a more balanced view of the risk.
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7806
Location: Brighton


PostPosted: Mon Dec 30, 2019 7:01 pm    Post subject: Reply with quote

well .. i posted this as a thread were people could see what these look like in bits and to point out we have started to see them as being a possible problem ..

What for me is a lot is not so in the real world i guess ..

Never seen a problem before but 4 in less than 6 months had me thinking i'd mention it .

More so due to the fact you can check the degradation on a tester and none of these should have had a fault or needed an oil change .

I can't say the reason for the failure , logically a calibration should fix this fault .. but it doesn't .

In short i have limited info so all i can suggest is change the oil early on these .

If you have the full off road package then the car is horrendous to drive when the transfer box starts messing about .. scared the crap out of me i can tell you !


I point out what i see .. i leave it upto you lot to make what you want out of the info Smile

An oil change without telling the car its been done strikes me as the way forward .. but i'm afraid i can't condone that .. it's just a hunch .
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