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Car Forum / MINI / January 2004

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Whining automatic gearbox

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minirepository.com - 30 Dec 2003 01:03 GMT
As some of you might have seen from my other thread, I am having to consider
scrapping my mini entirely, because of a gearbox that is doing odd things.
It would absolutely break my heart do do this, as the engine itself - along
with the majority of the rest of the car - is in pretty good shape. My
choice as to what to do will therefore depend on what is wrong with the
gearbox.

The problem:

When giving a lot of gas from standstill, there is a fairly loud whining
sound (try saying "eeeep" while breathing in, that is the closest
onomatopoeticon I can come up with). The same sound happens when
accelerating hard, as the gearbox changes from 2-3 and from 3-4.

As the sound happens, there is little or no power going to the wheels.

In my little layman world, the effect is the same as when you are driving
around with a "tired" clutch - as in: The clutch won't grip properly.
However, as this is an automatic, I assume there is no clutch involved, so
ut must be another part (synchro? Is there such a part?) that is worn.

My question, then: Which part is literally singing on its last verse? And -
far more importantly - is there any way you can replace this part, instead
of having to scrap a perfectly usable engine, or sourcing a "new" automatic
gearbox? The engine in question is a 1988 998 automatic.

H Kamps

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Steve - 30 Dec 2003 09:09 GMT
> As some of you might have seen from my other thread, I am having to consider
> scrapping my mini entirely, because of a gearbox that is doing odd things.
[quoted text clipped - 23 lines]
>
> H Kamps

Hopefully, Graham will come in on this one. He seems to have a significant
knowledge of auto transmissions. But if the revs are increasing and dropping
between gear changes (like a slipping manual clutch), then the bands in the
gearbox a slipping. If you are lucky, they can be adjusted. You will really
need to talk to a local auto transmission specialists.

Signature

Rgds
Steve
steve@dsnclassics.co.uk
www.dsnclassics.co.uk

Dave Yardy - 30 Dec 2003 11:28 GMT
> As some of you might have seen from my other thread, I am having to consider
> scrapping my mini entirely, because of a gearbox that is doing odd things.
[quoted text clipped - 23 lines]
>
> H Kamps

When was the oil last changed? - Auto boxes need clean oil...

TTFN,
Dave
minirepository.com - 30 Dec 2003 13:13 GMT
> When was the oil last changed? - Auto boxes need clean oil...

I have changed my oil twice since I got the car 6 months ago, so I think
that shouldn't be the problem.

H
Nicholas Bales - 01 Jan 2004 12:56 GMT
> > When was the oil last changed? - Auto boxes need clean oil...
>
> I have changed my oil twice since I got the car 6 months ago, so I think
> that shouldn't be the problem.

And what oil did you use?
K - 30 Dec 2003 19:43 GMT
Hi,
Your gearbox has 2 clutches and 3 brake bands, and the noise you describe is
that of slipping clutches. It is a major stripdown to repair this and can be
quite expensive in terms of labour as it means removing the engine. Very few
mechanics are prepared to tackle a Mini auto box as it is rather complicated
and needs a few special tools. Could I suggest you look for a good
engine/box unit and carry out a transplant. I would suggest looking for a
Mini which has been written off either for MOT or accident, because in these
cases, it is likely that the box was in good order at the time of write-off.
Keith
Graham - 06 Jan 2004 01:06 GMT
> Your gearbox has 2 clutches and 3 brake bands, and the noise you describe is
> that of slipping clutches. It is a major stripdown to repair this and can be
> quite expensive in terms of labour as it means removing the engine. Very few
> mechanics are prepared to tackle a Mini auto box as it is rather complicated
> and needs a few special tools.

To replace the forward clutch the manual suggests you need the forward
clutch holding tool and the pipe aligning tool. You can use an assistant
with a screwdriver in lieu of the former, and make up your own carboard
template or align the pipes by eye for the latter.

> Could I suggest you look for a good engine/box unit and carry out a transplant.

By the time you've got the motor and box out, you may as well replace
the forward clutch. Anyway, auto minis which only go backwards are by
far the cheapest source of auto motors and boxes - but you have to
replace ......  the forward clutch.
K - 30 Dec 2003 19:48 GMT
Hi,
As an afterthought to my last post, I have a Metro engine/ auto box in my
yard for sale. I don't want much for it, just to get it out of the way. The
box is in V good condition as it was intended for my wife's Mini, but it
failed the MOT before I fitted it, so it is still in the yard. The Mini was
sold off for restoration to a local Mini enthusiast.

I am in Southampton.

keith
minichicago - 31 Dec 2003 00:32 GMT
MiniChicago wrote:12/30/03 1:48 PM
Keith sold me an unleaded head from the same project and I will say he is as
honest and genuine as they come.  I would buy it!

> Hi,
> As an afterthought to my last post, I have a Metro engine/ auto box in my
[quoted text clipped - 6 lines]
>
> keith
minirepository.com - 31 Dec 2003 10:14 GMT
wow, sounds too good to be true. I've emailed you, Keith!

Haje
K - 01 Jan 2004 15:57 GMT
Hi, Yes, I got the e-mail, but the return addy was a dud, can you resend
with a genuine addy?
Keith
Graham - 06 Jan 2004 01:06 GMT
> As some of you might have seen from my other thread, I am having to consider
> scrapping my mini entirely, because of a gearbox that is doing odd things.
> It would absolutely break my heart do do this, as the engine itself - along
> with the majority of the rest of the car - is in pretty good shape. My
> choice as to what to do will therefore depend on what is wrong with the
> gearbox.

> The problem:
> When giving a lot of gas from standstill, there is a fairly loud whining
> sound (try saying "eeeep" while breathing in, that is the closest
> onomatopoeticon I can come up with). The same sound happens when
> accelerating hard, as the gearbox changes from 2-3 and from 3-4.

Forward clutch is slipping.

> As the sound happens, there is little or no power going to the wheels.
> In my little layman world, the effect is the same as when you are
driving
> around with a "tired" clutch - as in: The clutch won't grip properly.

Yep. The forward clutch is slipping. It doesn't do it in reverse, does
it?

> However, as this is an automatic, I assume there is no clutch involved, so
> ut must be another part (synchro? Is there such a part?) that is worn.
There are two clutches, three bands and a one way sprag clutch in the
auto.

> My question, then: Which part is literally singing on its last verse? And -
> far more importantly - is there any way you can replace this part, instead
> of having to scrap a perfectly usable engine, or sourcing a "new" automatic
> gearbox? The engine in question is a 1988 998 automatic.

Yes.

The forward clutch is the first thing you pull out the end of the
gearbox when you take the end off. But first check things like oil level
and pressure.
 
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