<VV> diff snout replacement

[Mike McCrae]

If one reads the manual carefully, all of these questions are answered, and 
in the proper order. One of the things most overlooked is the very important 
inch lb. pre-load applied to the pinion bearing when assembled. One must 
have a very precision torque wrench and the proper tools of application in 
order to do this. Since I build diffs, I had to fabricate all of these tools 
in order to do the proper job. I can't see someone with just the bare 
necessities do a good job and have it function like it's supposed to. One 
has to also be able to interpret the load patterns on the ring/pinion in 
order to place the correct shim under the pinion bearing.....

Mike McCrae

-----Original Message----- 
From: djtcz at comcast.net
Sent: Monday, July 01, 2013 10:48 AM
To: virtualvairs at corvair.org
Subject:  diff snout replacement




https://lh6.googleusercontent.com/-j-cT0zGW7qk/URc2W8zjQHI/AAAAAAAAJ3Q/d2PHq2XSC18/s800/1961%2520Corvair%2520Differential%2520Exploded%2520view%2520004.jpg

The right and left side differential adjusting "nuts" vary the backlash, and 
the carrier bearing preload.
Those 2 are only 1/2 of the adjustment when "setting up" a ring and pinion 
gear.


The thickness of the shoulder on the snout, along with the Timken bearing 
effective height, sets the pinion fore and aft location relative to the non 
adjustable (in that direction) ring gear centerline. Changing the snout 
and/or bearing may require changing the shim thickness to achieve the 
correct tooth contact pattern.



Examples of "Bad" pattern requiring moving the pinion fore/aft with shims 
are Example D and E in Fig 24 here -
http://www.gmpartswiki.com/getpage?pageid=17225


the shim is item 36 here -

http://www.corvair.com/2013SPGFX/123.jpg


The pinion bearing preload may also be effected when replacing the snout or 
bearing.
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