[DeTomaso] follow up on ZF output bearings

[Tomas Gunnarsson]

If you can't get an opinion from Lloyd I'd suggest going for closer to the recommended backlash rather than what you think is a nice contact pattern.

Tomas

----- Original Message ----- 
From: "charles buthala" <charlesbuthala at yahoo.com>
To: <detomaso at realbig.com>
Sent: den 11 mars 2007 07:03
Subject: [DeTomaso] follow up on ZF output bearings


> All Righty then, I got the bearings for the output shafts of the ZF and installed them.  I bent the rules slightly by measuring the traction force of the output shaft and added it, ratio, to the traction force of the differential to adjust the taper bearing / differential torque.
>   In this way I did not have to remove the ring gear from the differential in order to install the bearings and adjust the backlash / gear contact pattern.  Three trials were needed in order to get the proper traction force of between 12 and 16 Lbf, and a proper elliptical pattern on the drive side of the ring gear when bluing was used.  
>   In the manual it states that the backlash or slop in the ring gear should be adjusted to the amount written on the ring gear.  I found this on the ring gear; Stamped (1031 309 045 ZF 1), and etched ( 4678, D:75,00 sp; 0,20 (30,8,72). On the two gear teethe on either side of the "sp" were Theta symbols?  I am guessing that the backlash is the sp; 0,20 or 0.008 inch.  
>   Now the confusing part the back lash was 0.019 when I got a vary nice pattern on the drive side of the ring gear.  The cost side was slightly to the toe side of the gear teethe.
>   I had to remove 0.0085 shim on the left and add this shim and an a 0.006 shim additional to the left side to get this result.  I am concerned with the backlash of 0.019  and slightly concerned with the toe pattern of the cost side of the wear pattern.  Any comments would be greatly appreciated.
> 
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