Drive Wheel/Spur Gear Tapered Roller Bearing Pre-Load, Determining

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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

Magnetic Plate 50 mm Dia.VW 385/17 from the Universal Measuring Tool VW 385
Dial Gauge Holder VW 387
Crown Wheel Adjustment Device VW 521
Dial Gauge Extension from the 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 - or 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: Installing Gear Carrier On Transmission

Courtesy of AUDI OF AMERICA, LLC

Installed position: The tab -arrow A- on the gear carrier -1- must installed into the opening -arrow B- inside 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.

-- Attach the VW 387 in the hole in the transmission cover using the bolt -B- and nut.

Fig 3: Checking Drive Wheel/Spur Gear Play

Courtesy of AUDI OF AMERICA, LLC

-- Position the dial gauge extension in the center of the measurement plate VW 385/37.

-- Set the dial gauge (3 mm measuring range) with 2 mm pre-load to 0.

-A- dial gauge extension from the 2066

-- Move the drive wheel/spur gear up and down using the crown wheel adjustment device VW 521.

-- Read the play off the dial gauge (for example 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.