gear box problem

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Robert Oor - 31 May 2004 11:54 GMT

Hello;

I trying to build N 1300CC metro engine in an mini 1000. I tried to attach
the 1300cc engine block to the 1000 gearbox but found out that the
gearwheel on the crackshaft is different from the one on the 1000 cc
engine.
Does anyone know,how to solve the problem of transmission differences
because of different tyre size 10"for the 1000 mini and 12"for the metro ?

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Groeten
Robert Oor

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Jono Barspeed - 31 May 2004 15:45 GMT

i would suggest that if the crankshaft flywheel is a differant size then you
may have to fit the 1000 to enable a fit. You may have to consider doing a
diff swap as well to overcome the output of the 1300cc motor and a 998
gearbox and diff, which at times can cause high rev output and only slow
speed.
Why didnt you opt for a complete 1300 engine and box, this would have meant
just dropping it all in and only worrying about recalabating the speedo?

jono

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> Hello;
>
[quoted text clipped - 4 lines]
> Does anyone know,how to solve the problem of transmission differences
> because of different tyre size 10"for the 1000 mini and 12"for the metro ?

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Robert Oor - 31 May 2004 20:14 GMT

> i would suggest that if the crankshaft flywheel is a differant size then
> you may have to fit the 1000 to enable a fit. You may have to consider
[quoted text clipped - 6 lines]
>
> jono

The cranckshaft flywheel is the same size, the problem are the teeth of de
primairygears and the priseshaft the gears have thicker teeth and a bigger
diameter on the shafts, I solved the problem by leaving the gearboxes with
the engine they belonged, To solve the problem of the different wheelsizes
I just exchanged the diff and endgear together with the gearing off the
tachometer.

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Groeten
Robert Oor

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Graham W - 31 May 2004 21:34 GMT

> The cranckshaft flywheel is the same size, the problem are the teeth of de
> primairygears and the priseshaft the gears have thicker teeth and a bigger
> diameter on the shafts, I solved the problem by leaving the gearboxes with
> the engine they belonged, To solve the problem of the different wheelsizes
> I just exchanged the diff and endgear together with the gearing off the
> tachometer.

Didn't they change the drop gears when they introduced the A+ motor?
This isn't an issue of 1275 versus 998, it's a change of motor design?

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Robert Oor - 31 May 2004 22:57 GMT

>> The cranckshaft flywheel is the same size, the problem are the teeth of
>> de primairygears and the priseshaft the gears have thicker teeth and a
[quoted text clipped - 5 lines]
> Didn't they change the drop gears when they introduced the A+ motor?
> This isn't an issue of 1275 versus 998, it's a change of motor design?

It could be yes the 1300 enginew is from an austin metro build 1987 and the
mini 1000e is from 1983, and it could be that the engine is even older
because one of the former owners already replaced it with ab engine from
the scrapyard....

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Groeten
Robert Oor

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Lock Horsburgh - 01 Jun 2004 17:16 GMT

> > The cranckshaft flywheel is the same size, the problem are the teeth of de
> > primairygears and the priseshaft the gears have thicker teeth and a bigger
[quoted text clipped - 5 lines]
> Didn't they change the drop gears when they introduced the A+ motor?
> This isn't an issue of 1275 versus 998, it's a change of motor design?

Yes. Use the drop gears from the 998?

Lock

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Steve - 03 Jun 2004 17:56 GMT

> > > The cranckshaft flywheel is the same size, the problem are the teeth of
> de
[quoted text clipped - 13 lines]
>
> Lock

All 1275 primary gears have a stepped bore. All others have a parallel bore.

There were 2 different tooth profiles and helix angles. As Graham suggested,
the A+ ones won't fit the earlier ones.

So you will have to find an idler and input gear to match your 1275 primary
gear.

If the 998 was original to the 1983 car, it should be A+. But if the tooth
profiles are different, it must be out of an earlier car.

Do you still have the 1275 gearbox? If so, you can swap the other drop gears
over.

As an aside, you will have to use a 1275 transfer casing. It has an extra
breather feature that the other engines don't have. It will also need to be
from a later car to give you the correct idler gear bearing size (this
changed with A+ as well).

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

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