901 ZF LSD rebuild, 30 years of parts collecting pays off Options

[mgphoto]

Hello,
I started collecting parts of this project 30 years ago and the last parts have fallen into place.

In this post I hope to clear up some confusion and convey some of what I found trying to complete this project.

First piece


purchased form PAR in Yonkers NY 1986 914.332.209.00 casting number 51D

The LSD found its way to me in 2013 from the venerable Cap'n Krusty



The diff needed some work as it was missing internal spring plates which are NLA.

Item number 4 in this factory illustration.
This part places tension on the clutch pack which is measured as drag.
The factory spec on this is 29 - 58 ft. lbs

This item can be replaced by what is now called a "cup" spring from and early 928
part no. 928.332.555.00

seen here as item number 10

As for the internal wear parts, the 914 parts are NLA but, get this they are replaced by mostly 917 parts! WAY COOL.

Just the beginning, stay tuned!
Mike

[oldie914]

When installing a new seal, clean the rust off the flange with a wire wheel. Check the seal location on the flange with your fingernail to see if there is a groove. You can live with a little wear but not much.
Make sure the new seal is at full depth in the case so the seal is running on clean metal. You can check the seal contact location by smearing a light coat of grease on the flange and putting in in place. Pull it back out and you can see where the seal lip makes contact.
It is amazing the number of different axle flanges Porsche used. There were 4 or 5 additional types used during the 1965-68 model years.
They also tried 3 different methods for securing the differential gear shaft from 1965-70. Finally settled on the block and retaining pin system for the 914 and the 1970 model year 911.