Hi I hope you guys can help me out here. I mostly hang out on the 930 forum but I need some advice with my 1984 MY 3.2 carrera sport coupe.

I had some noise coming from my 915 transmission. When I opened it up I found that the larger bearing retaining plate had come loose. I am not sure if the previous mechanics torqued up the nuts properly or not. Anyway the bearing was damaged and the usual syncromesh parts.

I found that the large retaining plate had become bent so I straightened it. I then decided that it would be best to replace it and as you guys know it is NLA from Porsche. I remembered there being a USA part made & so I enquired about the Wevo XT-032. I had a few concerns about the two bearings not being evenly clamped down as one part was trying to hold two bearings, especially as one was new and the other AFAIK the original 1983 part. I took some measurements and compared with what Wevo told me and I happily bought their part.

http://www.wevo.com/Products/Transmi...ngRetainer.htm



However, upon receiving their part I saw another potential problem that I need some opinions on. I have not contacted Wevo yet as they must think I'm a PITA for asking about all those dimensions previously... They were very reluctant to share dims with me to say the least. I understand their position but I needed help.

The problem I see and I hope that I am worrying about nothing is that where studs come through the holes in the Wevo part, where the nuts & washers seat onto it are not completely flat. There is a small drop in the very centre of the hole. Here are the pics I took. Maybe I am just worrying about nothing and being ****. I tend to be **** when it comes to my beautiful Porsches. I note that the stock plates were recessed, but flat.









TIA

 

Just did some measurements & the difference between the heights is 0.06mm or 0.0024"

 

I was asked to remove the email by Hayden of Wevo.
The outcome is that I am very happy. Hayden exchanged the part for me and helped me out with how to fix it.

 

Hayden stands behind his products for sure, glad to see it was resolved.

 

Yes, it seems so

This was my first purchase with Wevo and at first I was a little unsure. There are so many bad companies here in the UK...

He has helped me as much as is possible & I am very grateful to him.

 

Yeah FWIW, that's pretty normal to see a step when there's a tool change with a CNC machine. Even the aerospace parts we make are going to have a visible step, which can be chem or physically abraided out for a more uniform surface.

Functionally, you're not ever going to notice anything under .002", especially if the plate is aluminum. I'd be using blue loctite on bolts like this anyway (not knowing what's specifically called for or what the tq settings / lock washer situation is). If this is a hardened steel piece for example, I'd be concerned & would likely knock that down a little for a smooth bolt to surface.

But then, that's just me. Others here are far more knowledgeable.

Good luck!

 

I am fitting the replacement with K nuts & Schnorr washers. Green loctited the new studs in.

 

K nuts?

 

At the top of the nut (the last few threads) the thread is tapered so the nut is very tight on the thread. This stops them coming loose. I believe they were invented for Aerospace.
Annoyingly they are not for sale on ebay.co.uk.