Anybody got any tips or tricks, do's or don'ts when it comes to repairing a crack in a transmission case.
The crack that I have is inside the box, above the main shaft bearing housing.

Anybody experienced with "Durafix" etc or any other suggestions?

Yes gearbox cases can be TIG welded, but...
If it's anywhere near a high stress area, ie in the bearing webs, I'd bin it and go find another case. Plenty of most models still about.

Even if your repair is successful you may distort the bearing seats.

What case are you after? (p/no number is cast into front of box)


unless it's purely cosmetic, forget the epoxy etc based products, they have bugger-all strength really.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Hi Kev
Case Number A/BZ6 DAM, BC&M 4818

Main Internal web that holds the bearing for the main shaft.
(Third motion shaft ball bearing)
Hairline crack through metal in the most central upper bolt area.
[/img]

Your advice on this is that products such as these are no good?

[url]http://durafix.com/

[url]http://www.techno-weld.co.uk/product.html

I have got some of that durafix stuff, it goes by a variety of names, you see it at boat shows.
Yes you can `weld' beer cans with it, I've done it too... but it is NOT aluminium, it's a very low temp alloy.
I would NOT trust it for a Mini gearbox repair, unless it's a simple crack somewhere in the outer case.
If your gearbox web is cracked, even if you TIG it with proper alloy rod you will soften the material and it will be much weaker than original.
It's a high stress area, yes they crack there sometimes.

<ecit> Yours is an early A+ case, with the 4 bolt bearing retainer. later ones went to 3 bolt to avoid this..
I'd post an ad in wanted forum...

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

is it a rod or a remote box

_________________
FOR SALE MInidlx, 1293, GR head, RE-13, GR worked Redline Manifold, 45 mm DCOE,pulsar dizzy , "S" Disc's, Mk II "S" box, 3.65 diff. Minator 10X6's On the loose

Rod change, A+ by those numbers.
Bigger idler gear shaft than the common Oz A series rodchange.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Hi Kev

Owing to the probs associated with finding another case, which may also be suffering this problem. Are there any other cases that would be usable, eg the three bolt bearing retainer case etc.
Also are there any engine parts that come close to the bearing retainer web? what I'm driving towards is it possible to weld a gusset on the top surface of this web without interfereing with moving parts etc.
Regards
Gavan

Don't know lots about A+ cases, but there are 2 later ones than yours listed in my book- DAM2886 (4 bolt retainer) and the DAM5626 (3 bolt retainer).
PM TheMiniMan, he may have one.
There has gotta be some A+ cases around, I'd check also with Steve at Brickworx.

Conrods do go pretty close to that web.....

If all else fails get it TIG welded professionally by someone who knows what they are doing, and have the housing then checked for distortion.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

i really wouldn`t weld it there,,,that`s a nice place for distortion to occur for sure!!! & obviously not the place that you`d want it to be distorted

swap cases

& yea, i have one but you`re miles away, try someone closer first & if you`re stuck then ring me

cheers

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

How much would you want for it?
Running out of avenues down here.
Regards
Gavan

PM Josh Miniimports on here,he brings in A + engines and boxes or the bloke from Northern he imports them to

Jon

_________________
Roundies and Clubbies(except vans) are both ugly that is why I have Midas and a van
1293 Mini Midas Bronze,1275 Clubman van