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Home > Technical Chat > Gearbox casing strengthening

neil_g

64 Posts
Member #: 1175
Advanced Member

Nr Bournemouth

3rd Oct, 2006 at 02:47:13pm

My old car had a habit of cracking the centre web ( later 3 bolt type )


i thought the later A+ boxes were the 2 bolt type because rover noticed the problem on the metty turbos and stopped putting the extra bolt in?

from what i remember them saying on the mini builder dvd.. not sure how accurate my memory is though.

turbodave16v
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10980 Posts
Member #: 17
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SouthPark, Colorado

3rd Oct, 2006 at 02:58:13pm

early 4-bolt, later - 3bolt.

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stevieturbo

3594 Posts
Member #: 655
Post Whore

Northern Ireland

3rd Oct, 2006 at 05:44:47pm

Rover musnt have know too much, as they fitted crap bearings to the boxes.
Nearly every factory built box I took apart, had failed bearings.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


jukka

302 Posts
Member #: 60
Forgotten more than most ever know

4th Oct, 2006 at 09:04:56am

Stevie, glad to hear that you are bored with the Granny and thinking about upgrading your Mini *smiley*

Couple of comments: the gearbox casings are very rough indeed, anyone that has had a look inside Jap boxes know what I mean. It is always a good idea to smooth the surfaces but with Mini casings it means grinding very deep at various locations. I have not bothered with my boxes yet. It is also quite complicated to gain access to all locations. The Rover block I bought from Stevie was actually ground smooth but it took me a couple of nights in the garage.

As for bearings, Rover did a major downgrading, the pre A+ used to have brass casing keeping the balls in place whereas later had plastic. Not surprising these usually fail. The last box I rebuilt for a Mini racer had a mainshaft bearing that had a cracked outer race.


stevieturbo

3594 Posts
Member #: 655
Post Whore

Northern Ireland

4th Oct, 2006 at 05:38:18pm

All I recall, is theat the crap bearings had 10 balls, and the good ones 11....

The 11 balls had a white nylon cage I think ??? and were the preferred ones that didnt give bother.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

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