E30 325iT 3:91 differential.

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NigelA
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Sat Oct 02, 2021 12:18 pm

If anyone has an E30 325iT 3:91 differential available I would like to know please. There was an 'advisory' on the last MOT test and the next MOT is due shortly.
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martauto
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Sat Oct 02, 2021 2:24 pm

What did they "advise" on ?

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NigelA
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Sat Oct 02, 2021 4:19 pm

That the casing was degrading.
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martauto
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Sat Oct 02, 2021 5:22 pm

NigelA wrote:
Sat Oct 02, 2021 4:19 pm
That the casing was degrading.
I have never come across this before 8O 8O
Do you think it was a bit of rust on the outside ?
Please don`t use them ever again.

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NigelA
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Sat Oct 02, 2021 6:51 pm

Many thanks, Mart. That was really helpful. Yes, the tester said exactly that. So I take it you are saying that the diff structure is sufficiently robust for this not to be a problem?
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rix313
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Sat Oct 02, 2021 8:37 pm

The cases are so thick and the tester appears to be as well. Get yourself to a proper MOT station and job done.
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aimlessrock
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Sat Oct 02, 2021 8:44 pm

they are serious heavy hunks of metal - it would take 2 lifetimes of abuse to even start to do any damage to the case- remove one and you will see what i mean.

It its a bit tatty remove from the car it and give it a good clean and overhual and a good coat of Hammerite and it will be fine for the next 30 plus years.

That MOT tester is clearly not used to working on proper cars.
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Sun Oct 03, 2021 12:32 am

Rather than immediately assuming the tester is thick, is it possible he's referring to the back plate? It's not unknown for them to crack/leak, and any damage around the mounting point would be dodgy.
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NigelA
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Sun Oct 03, 2021 10:36 am

Many thanks, rix313, aimlessrock and Cloggy Saint for your helpful comments and suggestions but also for being so quick off the mark. Much appreciated and points noted.
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martauto
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Sun Oct 03, 2021 1:26 pm

NigelA wrote:
Sat Oct 02, 2021 6:51 pm
Many thanks, Mart. That was really helpful. Yes, the tester said exactly that. So I take it you are saying that the diff structure is sufficiently robust for this not to be a problem?
Nigel
Yes. :D :D

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Just got too old.
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martauto
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Sun Oct 03, 2021 1:27 pm

rix313 wrote:
Sat Oct 02, 2021 8:37 pm
The cases are so thick and the tester appears to be as well. Get yourself to a proper MOT station and job done.
:clap: :clap: :clap: :clap:

Mart.
Only the E46 cab left now.
Just got too old.
NigelA
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Sun Oct 03, 2021 2:42 pm

Thanks, martauto. Will do.
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martauto
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Sun Oct 03, 2021 4:23 pm

NigelA wrote:
Sun Oct 03, 2021 2:42 pm
Thanks, martauto. Will do.
No probs mate, that`s why we are here , to help each other and................we do not like jokers who are either trying to pull the wool over some ones eyes or they are simply inept.
We do know better when it comes to a forum which is specific to a particular marque.
Mostly winkeye

Mart.
Only the E46 cab left now.
Just got too old.
bmw-mad
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Mon Oct 04, 2021 10:12 pm

If you do need a diff drop Me a pm I have a 3.91 available
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NigelA
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Thu Oct 07, 2021 12:22 pm

Thanks, bmw-mad. Will do
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gareth
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Wed Dec 08, 2021 4:11 pm

It's not unheard of for diffs to rust through - despite being about 8mm thick! I've had three over the years that have holed after bead blasting. Much lighter though!

However, the diff does form part of the suspension (subframe has two mounts plus the diff bush) so technically a damaged backplate, bush or casing can compromise the integrity but I think we've just got a case of "arse covering" from someone who doesn't have much experience!
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NigelA
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Wed Dec 08, 2021 7:40 pm

Many thanks, gareth, very helpful.
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Wed Dec 08, 2021 9:12 pm

rix313 wrote:
Sat Oct 02, 2021 8:37 pm
The cases are so thick and the tester appears to be as well. Get yourself to a proper MOT station and job done.
Sound conclusion and advce here :D
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