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I have bought a spare differential which I'd like to get cleaned, all oil seals changed before it goes onto my S4. While I can do all the seals and stuff, changing bearings is a different ballgame. So my question is, how do you determine if bearings need changing? I'm sure it's few hundred quid in labour alone. I've heard diffs themselves are pretty bulletproof?
Tia
'93 Audi 100 Avant - R.I.P
'92 Audi UrS4 Avant - SOLD
'93 Audi UrS4 Avant
'15 Audi A7 quattro 3.0 TDI
Visual damage marks, they get excessively loud when spun and the spinning sensation is not smooth. Excess play can also be a factor, but depends on the bearing type.
Visual damage marks, they get excessively loud when spun and the spinning sensation is not smooth. Excess play can also be a factor, but depends on the bearing type.
So taking it apart is something that can be done at home?
'93 Audi 100 Avant - R.I.P
'92 Audi UrS4 Avant - SOLD
'93 Audi UrS4 Avant
'15 Audi A7 quattro 3.0 TDI
Yeah. You would need a puller of somekind to get bearings off.
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That's good to know. I always thought it is a very specialist job to do bearings and things as they're press fitted. I guess I'll just take it apart and see what condition they're in.
Any suggestions on where to get seals and what brand is best? I guess you can go wrong with Reinz and Erling.
'93 Audi 100 Avant - R.I.P
'92 Audi UrS4 Avant - SOLD
'93 Audi UrS4 Avant
'15 Audi A7 quattro 3.0 TDI
Yes they can be removed at home and then rebuilt with new bearings and shims seals with right tools,depending how worn bearings are usually just seals only need replacing like I did on my own,but the drain plug was seized and oxidised really bad nothing you can't sort out with bench drill
Yes they can be removed at home and then rebuilt with new bearings and shims seals with right tools,depending how worn bearings are usually just seals only need replacing like I did on my own,but the drain plug was seized and oxidised really bad nothing you can't sort out with bench drill
Thats great to hear. In that case I might as well do them if I have it on the table, I have a press at work too what tools do I need, anything specialist? Looked on Ebay and it seems it'll be about £100 in bearings.
'93 Audi 100 Avant - R.I.P
'92 Audi UrS4 Avant - SOLD
'93 Audi UrS4 Avant
'15 Audi A7 quattro 3.0 TDI
Thats great to hear. In that case I might as well do them if I have it on the table, I have a press at work too what tools do I need, anything specialist? Looked on Ebay and it seems it'll be about £100 in bearings.
I used a really big bearing puller to pull side casing of to start with as there's tabs be gentle as they can snap if you just attack it also I used a rubber mallet And some penetrating fluid as I gently pulled the casing each time it moved making sure it was equal gaps through out removing casing there was really thin shims in Mine so I reused them also buy new Allen bolts I got mine from Quattro corner and small seal big seal was from a s2forum member can't remember user name Pauluis?! I think the Allen head bolts need torque up properly as I found out I over tightend them
If you do this Janis,would you take pictures of the process including changing the diff seals? Will be doing this on Lee's car as his seals need changing.
96 URS6 plus speck saloon
96 URS6 plus speck estate
94 2.6 80 Avant
99 2.8 final edition Cabriolet
Bearings i would leave well alone until they are noisy, note replacing and shimming is a royal pain in the butt.
So when I get the diff should I just turn it and listen for any bad noises? I don't fancy putting it on the car and realising it needs to come back out. Saying that my 200k+ diff in mine isn't making any noises.
'93 Audi 100 Avant - R.I.P
'92 Audi UrS4 Avant - SOLD
'93 Audi UrS4 Avant
'15 Audi A7 quattro 3.0 TDI
The outer race is pressed into the housing, while the bearing rollers stay on the diff so it will be easy to visually inspect them. For the input shaft you can just rotate it and feel for any resistance. Honesty the chances of the bearings being bad are remote, i don't recall ever hearing of anyone having issues with them.
91CQ20v - Gone to a new home
93UR-S4 - The Magic Carpet
94S2Bus - The Emerald Express
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nothing you can't sort out with bench drill 
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