915 Case... Stock or modfied?
 

Hi all

I'm sure some of you have seen my other thread about my failed final drive and broken diff bolts. http://forums.pelicanparts.com/porsche-911-technical-forum/462734-915-shift-fork-check-unexpected-outcome.html

This is my case. I'm cleaning everything before putting it back together. I don't plan to disassemble the two main shafts but I do want to clean the cases thoroughly before re assembly.

Now my question....

Is this a stock case or has there been a modification done to hold the bearing races in place? I'm pretty sure it's been modified...

I have looked closely between the two races and the case dos not appear to be cracked. Both races seem secure. I do not intend to touch this in anyway.

Thanks in advance

Peter :cool:

http://forums.pelicanparts.com/uploa...1237976279.jpg

http://forums.pelicanparts.com/uploa...1237976314.jpg

63 views and nobody knows? :confused:

The dates on the case are 77....

I can't say with absolute authority, but it looks as if someone has wedged the bearing races in the case, perhaps because they were loose? These are usually pressed in and don't come out unless the surrounding aluminum has been distorted. Here is a picture of mine (from an '84) with the loose race lifted up for comparison:

http://forums.pelicanparts.com/uploa...1238036406.jpg

Q: out of curiosity, are those wedges of metal ferrous? (Will a magnet stick to them?) I'm curious as to what technique was used here.

Peter, It looks totally stock to me.

I thought the same thing when I first saw it. I tried a magnet at first but it did not stick. There are in fact no wedges in there.

It looks like the alloy has been cut out with a chisel and shaped by hand. I'm guessing it was done so that the alloy could be pressed at the three points per bearing to "close" the hole without changing the pinion shaft settings.

It looks dodgy but the races are secure... I can also see a dark material - greyish green that surrounds each race. This may be some sort of bearing retaining glue like "Loctite 635" which is dark green.

Peter Zimmerman has mentioned in a recent post about cases which had been "repaired" by someone else before they came to him. The bearing races were secured by punching the alloy surrounding them. These cases were "shagged out"... With these cases Peter had a thin steel shim machined to surround the race and machined the case to accept the shim to stabilise the hole.

After seeing all the things wrong with my trans I wasn't I was completely surprised....