Help!! rear diff mount problem

fivepot · 22-07-10, 07:32 PM

Help

Have been renewing the gearbox and forward rear diff mounts on my Coupe Quattro this week and have hit a snag with the drivers side rear diff mount.
All the other centre bolts for the other mounts have come out easily after undoing the 17mm nut but this one is seized solid in the mount. (rusted?)
It really is stuck - have given it a good seeing to with a lump hammer and then tried jacking it against the weight of the car - but still no movement.Have a replacement bolt ready to go on with the new mount so not worried about damaging it
Any tips

would be greatly appreciated.
Cheers,
Steve

Audi Derek · 22-07-10, 07:40 PM

Steve you need to get the bolt to turn, that will break the seal as it sits in a sleeve that sits in the middle of the mount..

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Audi Derek · 22-07-10, 07:42 PM

If you need a hand I can pop over on Sunday..

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fivepot · 22-07-10, 08:05 PM

Cheers Derek - will give it a go tommorrow, space is a bit limited as the hex bolt head is on top of the diff arm with the mount below it (mount is above the diff arm on passengers side). There was a tube fitted to the passengers side mount and a much longer bolt used.
Don't think there's enough clearance to get a socket on it - will have to try with a spanner.
Thanks for the offer mate - will let you know how i get on

fivepot · 23-07-10, 04:16 PM

All sorted now thanks Derek

- applied some heat and tried turning it but no luck - then heated lots more and gave it a thump from beneath and very slowly started to get movement upwards - eventually ended up with enough clearance to get a hacksaw blade onto the shank of the bolt and cut the head off it .
Bit of a mystery how this one was so corroded all the others came out easily - guess this one gets the most weathering road spray etc.
Refiited all the new mounts using copper grease on the bolts so hopefully won't have same problem when i do the full subframes re-furb that i have been promising myself

22-07-10, 07:40 PM	#2
Audi Derek “Been raced and rallied” Classic Audi Club Member Join Date: May 2008 Location: Bridgwater Somerset Posts: 1,431	Steve you need to get the bolt to turn, that will break the seal as it sits in a sleeve that sits in the middle of the mount.. . __________________ Vorspurng durch Technik (see it does work)

22-07-10, 07:42 PM	#3
Audi Derek “Been raced and rallied” Classic Audi Club Member Join Date: May 2008 Location: Bridgwater Somerset Posts: 1,431	If you need a hand I can pop over on Sunday.. . __________________ Vorspurng durch Technik (see it does work)

22-07-10, 08:05 PM	#4
fivepot Grown up member Classic Audi Club Member Join Date: Mar 2008 Posts: 504	Cheers Derek - will give it a go tommorrow, space is a bit limited as the hex bolt head is on top of the diff arm with the mount below it (mount is above the diff arm on passengers side). There was a tube fitted to the passengers side mount and a much longer bolt used. Don't think there's enough clearance to get a socket on it - will have to try with a spanner. Thanks for the offer mate - will let you know how i get on

23-07-10, 04:16 PM	#5
fivepot Grown up member Classic Audi Club Member Join Date: Mar 2008 Posts: 504	All sorted now thanks Derek - applied some heat and tried turning it but no luck - then heated lots more and gave it a thump from beneath and very slowly started to get movement upwards - eventually ended up with enough clearance to get a hacksaw blade onto the shank of the bolt and cut the head off it . Bit of a mystery how this one was so corroded all the others came out easily - guess this one gets the most weathering road spray etc. Refiited all the new mounts using copper grease on the bolts so hopefully won't have same problem when i do the full subframes re-furb that i have been promising myself