Final Drive to Transmission Housing Seal, Replacing

Final drive to transmission housing seal, replacing

Special Tools and equipment






- VW681 extractor lever
- 3383 double seal installer
- VAG1306 drip tray
- VAG1358A oil siphoning unit

Notes
A faulty seal lets AT For gear oil escape into the converter housing via the center vent of the shaft seal (between the two sealing lips).
In addition, a faulty seal can let ATF escape into the center differential. It over-fills and oil escapes at the differential vent.

Removing

- Loosen bolt drive axle/wheel hub while the vehicle is still standing on its wheels.
- Remove front wheels.
- Remove heat shield for right drive axle.
- Remove drive axles, refer to Drive Axles, Bearings and Joints - Axle Shaft Assembly - Service and Repair - Procedures Service and Repair






- Remove bolt for flange shaft (arrow) while securing against turning using a drift.
- Using VAG1 358A oil siphoning unit, siphon gear oil from the final drive.
- Place VAG1306 drip tray underneath.
- Remove right drive flange Right Flange Shaft Seal, Replacing
- Remove right transmission support, refer to Transmission Mount, A/T - Service and Repair - Procedures Service and Repair






- Remove bolts for final drive cover opposite of shown tightening sequence and remove cover.
- Pull out differential and remove.






- Remove tapered roller bearing outer race of differential -1- and shim -2 which is behind it from transmission housing by hand.

Note: Shim is pre-determined and must not be exchanged for a shim with another thickness.

- Remove left drive flange. Seal and Grooved Ball Bearing For Left Drive Flange, Replacing






- Pull out seal.

Note: Extractor over must be positioned behind both sealing lips the seal. Do not position at outer circumference of seal, otherwise the contact surface in transmission housing will be damaged. When levering out, carefully guide extractor over.

Installing

- Check seal seat in transmission housing for damage; rework if necessary.
- Coat outer circumference and sealing lip of seal with ATF.






- Slide seal onto 3333 double seal installer so that the projecting sealing lip (arrow) of seal faces tool.






- Drive in new seal to stop.
- Install left drive flange. Seal and Grooved Ball Bearing For Left Drive Flange, Replacing






- Insert adjustment shim -2- and tapered roller bearing outer race for differential -1- into transmission housing up to stop by hand.






- Replace O-ring (arrow).
- Insert differential into transmission housing.






- Install cover for final drive.

Tightening sequence:
1. Stage: Tighten bolts 1 to 3 by hand
2. Stage: Tighten bolts 1 to 12 in mentioned sequence to tightening torque.

- Install right drive flange. Right Flange Shaft Seal, Replacing
- Install right transmission support, refer to Transmission Mount, A/T - Service and Repair - Procedures Service and Repair
- Installing drive axles, refer to Drive Axles, Bearings and Joints - Axle Shaft Assembly - Service and Repair - Procedures Service and Repair
- Top-up and check gear oil in front final drive Gear Oil In Front Final Drive, Filling Up After Repair

Tightening torques