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Final drive, differential, differential lock > < Special tools

A4 Mk3

Components
Components
Rear final drive
t  Allocate bolts and other components according to final drive code letters, refer to → Electronic parts catalogue.
t  When installing a new rear final drive unit, check the gear oil level → Chapter and the ATF level → Chapter in the final drive and top up if necessary.
t  Capacities and specifications → Chapter.
t  When installing mounting brackets as well as other waxed components, the contact surfaces must be cleaned. The contact surfaces must be free of wax and grease.
t  Thoroughly clean all joints and connections and the surrounding areas before dismantling.
ATF and gear oil
The rear final drive unit 0BF/0BE has separate fillings for ATF and gear oil.
t  For the hydraulic system (hydraulic control unit and superposition gears, left and right) use only the ATF available as a replacement part → Electronic parts catalogue.
t  For the final drive (gear set and differential) use only the gear oil available as a replacement part → Electronic parts catalogue.
t  Other types of ATF or gear oil will cause malfunctions of the final drive.
Environmental and waste disposal regulations for oil
t  ATF, gear oil and any other type of oil must be handled with care.
t  Dispose of drained oil properly.
t  Always adhere to statutory environmental and waste disposal regulations.
t  Observe the information shown on the packaging of the oil.
Sealants
t  Thoroughly clean joint surfaces on gearbox housing etc. before applying sealing paste.
t  Apply sealing paste -D 176 501 A1- evenly and not too thickly.
t  Breather holes and oil channels must remain free of sealing paste.
Oil seals
t  Lightly lubricate outer circumference of oil seals before installation.
t  The open side of the oil seal should face the side containing the fluid.
t  After renewing oil seals, check gear oil level → Chapter or ATF level → Chapter (depending on fitting location of oil seal) in final drive.
   
Oil seal for propshaft flange
t  Pack space between sealing lips -arrow- half-full with sealing grease -G 052 128 A1-.
  N32-0001
Oil seals for flange shafts
t  Coat space between sealing lips -arrow- with ATF.
O-rings, seals and gaskets
t  Always renew O-rings, seals and gaskets.
t  After removing gaskets and seals, always inspect the contact surface on the housing or shaft for burrs resulting from removal or for other signs of damage.
t  Thoroughly clean housing joint surfaces before assembling.
t  Lightly lubricate O-rings before installation to prevent them from being trapped and damaged during assembly.
t  After renewing gaskets, seals or O-rings, check gear oil level → Chapter or ATF level → Chapter (depending on fitting location) in final drive.
Locking elements
t  Do not over-stretch circlips.
t  Always renew circlips which have been damaged or over-stretched.
t  Circlips must be properly seated in the base of the groove.
  N32-10016
t  Renew spring pins. Position: the slit -A- should be in line with the line of force -arrow-.
Nuts, bolts
t  Nuts and bolts for securing covers and housings must be slackened and tightened in diagonal sequence.
t  Loosen and tighten particularly sensitive parts in diagonal sequence and in stages, taking care to keep them straight.
t  The tightening torques stated apply to non-oiled nuts and bolts.
t  Always renew self-locking bolts and nuts.
t  Clean the threads of bolts which are secured with locking fluid using a wire brush (does not apply to propshaft bolts: these must be renewed). Then apply locking fluid -AMV 185 101 A1- to bolt threads before installing.
t  Threaded holes which take self-locking bolts or bolts coated with locking fluid must be cleaned (using a tap or similar). Otherwise there is a danger of the bolts shearing off the next time they are removed.
  A34-0149

Final drive, differential, differential lock > < Special tools