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Rear Differential Input Shaft Seal Replacement

Fred Munro has written an excellent DIY on replacing the left and right diff output shaft seals.
(http://12v.org/urs/FredMsAudiUrS4RearDifferentialRight&LeftSealDIY.pdf).

Recently, somebody on quattroworld asked about changing the input shaft seal, i.e. item 23 in this
diagram: http://12v.org/urs/RearDiffGearsWithInputShaftPN.jpg

The Bentley shows fewer parts than the above diagram and no Item 19 lock ring. It seems to show pulling the Item 6 cover and the Item 25 flange shaft. It shows the Item 22 round seal (O-ring?) but
does not show the Item 23 radial shaft seal.

Anybody with any BTDT experience on replacing the Item 23 radial shaft seal.

TIA

Dave F.

Is your Air Conditioning Weak on your UrS4 / UrS6?

If your A/C system is working OK at highway speeds but seems to fizzle out when in traffic or at a stop light it might be your aux fan resistor. When this part fails there is not enough air flowing through the radiator to lower the refrigerant temps. The resistor is located on the drivers side of the radiator (you may need to remove the headlight to get to it). The part number is 4AO 959 493 and ETKA calls it a series resistor for vehicles with heavy-duty water cooling system and/or trailing towing – ETKA list price is $92.00.