Renewing seal for propshaft flange — AUDI

Note:

The seal can be replaced with the rear final drive remaining installed. But the final drive must be lowered.

Removing

Remove cross member and rear exhaust system -arrows-

=> 8-cylinder engine, Mechanics; Repair Group 26; Removing and installing exhaust system
8-cylinder engine, Mechanics
Removing and installing exhaust system

Place drip tray underneath and drain oil.
Remove heat shield above propshaft.

Mark position of propshaft flange to rear final drive with paint -arrow B-, if not already marked.
Loosen securing bolts -arrow A- of propshaft on rear final drive.

Support propshaft using a wooden wedge -1-, press upwards against heat shield -2-.
Remove securing bolts of propshaft at rear final drive.

Support final drive with gearbox jack V.A.G 1383 or V.A.G 1383 A and V.A.G 1359/2.
Remove securing bolts -arrows- of left final drive support.

Note:

The rear final drive/cross member securing bolts are not loosened.

To ease removing and installing, lower rear final drive slightly at front.

Mark position of drive pinion nut relative to drive pinion.
To check when assembling, measure the following with a vernier gauge/depth gauge.
Dimension a = distance flange/drive pinion
Dimension b = distance flange/drive pinion nut

Note:

Illustrations show the final drive removed for the following work sequence.

Fit counter-hold tool 3028 and remove drive pinion nut.

Pull off flange with removal tool VW 391.

A -
Hexagon bolt M8 x 30

Pull out seal.

Installing

Install in reverse order.

Observe fitting instructions => Page
39-76
.
Renew O-ring between drive pinion bearing and flange.
Lightly oil O-ring before installing.

Moisten outer circumference of seal with gear oil.
Fill space between sealing and dust lips with multipurpose grease.
Drive in seal for propshaft flange onto stop with drift 3026.

Clean drive pinion nut and threads on drive pinion of oil and grease residues. Thinly coat threads with locking fluid D 000 600.

Note:

The same nut must be used again otherwise the original installation position will not be maintained.

-Fit propshaft flange onto drive pinion and assemble with drive sleeve 3143 until the drive pinion nut can be fitted.

Tighten drive pinion nut exactly onto previously marked position.
To ensure that the assembly is correct, perform check measurement dimensions -a- and -b-.
Maximum permissible deviation from original measurements: ±0.5 mm

Peen-over drive pinion nut shoulder.
Bolt final drive to final drive support.
Top-up gear oil in rear final drive and check oil level => Page
39-71
.
Measure run-out at prop shaft flange and mark => Page
39-88
.
Renew gasket on propshaft flange and tighten propshaft securely.
Align exhaust system free of stress

=> 8-cylinder engine, Mechanics; Repair Group 26; Aligning exhaust system free of stress
8-cylinder engine, Mechanics
Aligning exhaust system free of stress

Tightening torques

Component · Nm
Oil drain/filler plug · 35
Final drive support (front) to final drive M10 · / 40
Propshaft to final drive M8 · 55
Cross member to body M8 · 25