Spur Gear Tapered Roller Bearing Pre-Load, Determining

WARNING: This page is about a different car, the 2013 Audi S4, 2012 Audi S4, 2011 Audi S4, and 2010 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.

Determine the New Adjusting Shim "S₅ "

This adjustment is necessary when replacing the following parts:

Transmission cover
Center differential housing
Gear Carrier
Output wheel/drive wheel
Tapered roller bearing on the drive wheel/spur gear

Special tools and workshop equipment required

Measuring Set - Magnetic Plate - 50mm VW385/17 from Measuring Set VW385
Dial Gauge Holder VW387
Crown Wheel Adjusting Tool VW521
Dial Gauge Extension from Dial Gauge Adapter 2066

The outer race/tapered roller bearing for mounting drive wheel/spur gear is installed in the transmission cover.
The outer race/tapered roller bearing-without shim-for mounting the drive wheel/spur gear is installed inside the gear carrier.

-- Install the drive wheel/spur gear in the transmission cover.

Install the gear carrier on the transmission cover as follows:

Fig 1: Identifying Gear Carrier On Transmission

Courtesy of AUDI OF AMERICA, LLC

Installation position: The tab -arrow A- on the gear carrier -1- must be installed in the opening -arrow B- in the transmission cover.

-- Next, mount the center differential housing -B- to the transmission cover using the bolts -A- and -arrows- (5 bolts).

Fig 2: Locating Center Differential Housing Bolts

Courtesy of AUDI OF AMERICA, LLC

-- Then set the transmission cover with the attached center differential housing in vertical position making sure the center differential housing is facing downward.

-- Install the measuring tools.

Fig 3: Checking Drive Wheel/Spur Gear Play

Courtesy of AUDI OF AMERICA, LLC

-- Attach the Dial Gauge Holder VW387 to the hole in the transmission cover using a bolt -B- and nut.

-- Place the Dial Gauge Extension on the center of the Measuring Set - Gauge Block VW385/37.

-- Set the Dial Gauge (3 mm measuring range) to >>0<< with 2 mm pretension.

-A- Dial Gauge Extension from Dial Gauge Adapter 2066

-- Move the drive wheel/spur gear up and down using the Crown Wheel Adjusting Tool VW521.

-- Read the play off the dial gauge (e.g. 0.76 mm).

Example:

Measurement result (example)	0.76 mm
Preload (constant value)	+ 0.10 mm
Adjusting shim S₅ thickness	= 0.86 mm

NOTE:

Allocate adjustment shims.

-- Shim thickness "S₅ " in this example is 0.86 mm.