Video of my knocking

[maor]

Well I decided to make a video of it instead :

http://youtu.be/Tnbu3v_UA-k

I can really control that clunk knock with the throttle so easily.

I've replaced the rear engine mount, tranny mount and rear fork arms, oh and drop links and tightened sway bar...

I am now starting to think something with CV has it really sounds like its coming from that area? If it is the CV area what could it be and what would the fix be?

[maor]

Well I was less lazy this time well I think I have found the issue:

http://youtu.be/y2YynTxdFfU

Hmph, assuming it's a bearing but I am struggling to find this area on the parts catalogue PDF.

Anyone can point me to the area with a PN?

[Loren]

Please state the exact model and year of car and whether it is 4WD or 2WD.

[maor]

Sorry it's a 996 C2 Tip 2004 53

I'm rummaging through the parts catalogue but just can't find anything :S

Edited August 23, 2013 by maor

[maor]

image

[Loren]

I do not know if that play in the shaft is normal or not (don't have a Tip to look at right now). Perhaps some other member can check theirs?

If that is your problem you will need a couple of special tools to replace the shaft (assuming that is the issue). A couple seals will need to be press fit and bearing on the transmission side should be checked for wear.

[maor]

Hmmmm looks like that bearing that has no number will just be a standard off the shelf single row one.

[RFM]

The Tiptronic shown is a MB for A96.10 (C2) or A96.35 (C4). I fear that only specialized remanufacturers have the right parts at their disposal for repair.

[maor]

I'd like to have someone with the same tip as mine to just wiggle that shaft to see if it is indeed not normal.

Anyone there :(

[maor]

I am now suspicious that I have the Pinion bearing whine issue.

I do get a whine on the motorway but what isn't explained is this axle play I get on that bearing

http://forums.rennlist.com/rennforums/996-forum/579312-anyone-experiencing-a-gearbox-whine-might-want-to-read-this.html

[maor]

Well I am stuck.

Mechanic pin pointed the issue exactly to the spot on the picture. Whining and clunking there. 2 tranny rebuilders said the same but said parts are an issue. Diff rebuilder said the same and didn't want to get involved after seeing parts diagram.

No one is willing to take on my car and just say get a new tranny :(

Issue is right in here :

Am thinking about just dropping it, tearing the back off and see what is what.

Edited September 4, 2013 by maor

[Silver_TT]

I don't have a tiptronic to try that on but looking at your videos, I'm pretty sure that is not normal. It could be a bearing or it could be something else.

Assuming it's not normal you either can buy a reman transmission or try to get it repaired. If you go the later route just be sure you do your homework and get someone really good. RFM is right that the parts for this are going to be tough to get unless you go through a specialized rebuilder. The fact that two rebuilders told you they wouldn't do it because they can't acquire parts means to me that I wouldn't have wanted them doing the job in the first place -- as clearly they don't specialize in this specific gearbox. Having a generalist touch one of these gearboxes is a recipe for disaster. There's a certain order parts have to be removed in and special tools are required to make measurements, etc. This is the reason why if you ask Porsche they will tell you to just buy a new reman from them -- they won't even try to take yours apart.

That Rennlist link you posted was by a guy named Erik Johnson that used to work at Gbox as a sales guy for Stan Richardson, who is one of the best Porsche 996 gearbox rebuilders there is. Stan is out of Boulder, CO USA. To be honest I'm not sure if he does Tips and you are in the UK so that's probably not an option anyway, but I would certainly give him a call and hear what he has to say and what guidance he can give you. He's been working on Porsche gearboxes for something like 30+ years: http://www.gboxweb.com/

Last thing is that this is your car and you can do whatever you want, but if you care about that gearbox or might need to use it as a core later, I would not try to tear it apart. An untrained person trying to take apart a gearbox is simply trying to get it apart without breaking or damaging the parts. Often they do not accomplish this.

Edited September 5, 2013 by Silver_TT