Spur Gear Tapered Roller Bearing Pre-Load, Determining

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Determine the new adjusting shim S₅

This adjustment is required when the following components are replaced:

Transmission cover
Center differential housing
End shield
Spur gear
Tapered roller bearing on the 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 the gear wheel mounting is installed inside the transmission cover.
The outer race / tapered roller bearing with adjusting shim for the gear wheel mounting is installed inside the gear carrier. A 0.85 mm adjusting shim S₅ * must be used (part number 012 409 387 ED) for measuring.

NOTE:

For the initial measurement, an adjustment shim S₅ with a thickness of 0.85 mm is inserted. It is designated as S₅ * in the following. After determining the bearing pre-load, S₅ * is replaced by final S₅ .

-- Install the spur gear in the transmission cover.

Install the gear carrier on the transmission cover as follows:

Fig 1: Identifying Gear Carrier -Arrow A- Must Fit Into Opening In Transmission Intermediate Housing -Arrow B-

Courtesy of AUDI OF AMERICA, LLC

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

-- Attach the center differential housing -C- to the transmission cover using the bolts -A-, -B- and -arrows- (quantity: 5).

Fig 2: Attaching Center Differential Housing To Transmission Cover Using Bolts

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Not all versions have the double bolts -B- ; allocation.

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

-- Install measuring tools.

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

Fig 3: Attaching VW 387 In Hole In Transmission

Courtesy of AUDI OF AMERICA, LLC

-- Place VW 387 on center of VW 385/37.

-- Set dial gauge (3 mm measuring range) to >>0<< with 2 mm preload.

-A- VW 387 from the 2066

-- Move the spur gear up and down using the VW 521.

-- Read play on dial gauge.

Example:

0.26 mm

Example:

Installed shim S₅^*	0.85 mm
Measurement result (example)	+ 0.26 mm
Preload (constant value)	+ 0.10 mm
Thickness of adjustment shim S₅	= 1.21 mm

NOTE:

Allocate adjustment shims.

-- The thickness of the shim S₅ in this example is 1.21 mm.