Rear Diff OIL refill/topup

[Audi Doody]

Hi as an add on to the above, with a longer length of tube, the syringe can be used to draw off oil via the dipstick tube if you should overfill the engine oil.

mike

[no such user]

use a modifyed ezi bleed here, as there usless for bleeding brakes loose the cap off the end fill the bottel with gear oil and let it gently squirt it in

[alexisblades]

i used an easybleed the other day but wasn’t sure if the diff was full or not – it would overflow so it looked full, but then if i left it for a minute it would take more oil. there’s a suspicious whining coming from the back of the car, could my rear diff be knackered? oil seems to have been leaking past the driveshaft flange seals..

[Chris S]

The rear diff flange seals are not that difficult to replace.

[Audi Doody]

The problem is the input shaft is directly in front of the filling hole, trying to fill it too quickly means the oil hits the shaft, can’t drain into the diff fast enough and comes back out of the filling hole.
The whining could be coming from anywhere, diff, cv joints, wheelbearings, always difficult to diagnose without swapping parts
From what you say it does sound as if the flange seals have gone but might be unrelated to the noise!

mike

[no such user]

you just have to let it trickel in, drain the diff and place a clean bowl under teh diff to catch the oil that spills and just keep putting it back in till it’s had a whole liter

[alexisblades]

thanks for the help, i had another go and managed to fit another half pint in. slow and steady wins the race.

[Author]

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