gearboxes that go with 948cc

Post by **pskipper** » Tue May 09, 2006 5:47 pm

The long shot of the last few days of work is that Rosie needs her engine reconditioned. While I'm saving up so I can keep the original engine I've been offered a 948cc engine for free (at least this way I can keep her on the road).

My question is therefore will it mate up with the 1098cc gearbox? Do I need anything special/bodgy?

Post by **rayofleamington** » Tue May 09, 2006 7:34 pm

it will mate up, however not 'just like that'
The easiest way would be to take the clutch, flywheel and backplate off the 1098 and fit to the 948. Then it'll be a doddle

You'll need to remove clutch and flywheel to have the engine reconned, so nothing too drastic apart from needing a new gasket for the backplate.

Post by **pskipper** » Tue May 09, 2006 8:24 pm

So what's the difference between the fly wheels? (I have a spare but don't know which it's from, its 4 bolts though)

Post by **bmcecosse** » Tue May 09, 2006 9:00 pm

1098 has bigger clutch. I think the 948 clutch can be used - but the pedal travel may be excessive. Stick with the 1098 and no probs.

Post by **pskipper** » Tue May 09, 2006 10:11 pm

It doesn't have a clutch attatched, I meant more like diameter etc.

Thanks

Philip

Post by **Onne** » Tue May 09, 2006 10:13 pm

that is the difference, the 948 clutch is smaller. but as said there are more differences

Post by **rayofleamington** » Tue May 09, 2006 10:52 pm

you can do it with a 948 clutch, but there's little point and you'll need other parts (different thrust bearing but I think tha's it). Sorry if my first reply was a bit simplified - I was just trying to show the easiest route to go with bits that you will definately already have.
The clutch disk diameters are different therefore the clutch cover has different bolting diameter, therefore flywheels are different.

Post by **bmcecosse** » Wed May 10, 2006 7:27 am

But the overall flywheel mounting and diameter are the same. Ii's just the depth of the clutch is slightly different. Use the 1098 flywheel and clutch!

Post by **pskipper** » Wed May 10, 2006 7:56 am

Thanks, just one last question then.. Why change the backplate? I'm guessing it's something to do with the starter motor, or is it the clutch housing? I'll be going this route as Rosie needs a new clutch anyway and rather than buy a 948 one now and a 1098 one once the works done ....

Post by **rayofleamington** » Wed May 10, 2006 12:06 pm

Thanks, just one last question then.. Why change the backplate?

AFAIK all 948 have the thinner pressed backplate, and people say to use the 1098 backplate with the 1098 gearbox - I've never tried it any other way as I never wanted to find out that it doesn't work! ;-)
You can of course try it with the 948 backplate as it'd be interesting to know if it does work.... If there is a problem, you'll find out the hard way though

Post by **bmcecosse** » Wed May 10, 2006 1:11 pm

Could this be the difference for the clutch too ? Thicker backplate moves the box away from the engine by that extra 3/16" - which maybe gives the extra room for the slightly bigger clutch ? Use a small clutch in there - in the 'big' space - and not enough pedal travel ? Anyway I agree with the idea to use the 1098 backplate AND clutch !! Pheeeooooww.

Post by **pskipper** » Mon May 15, 2006 11:43 am

You can of course try it with the 948 backplate as it'd be interesting to know if it does work.... If there is a problem, you'll find out the hard way though

Just to let you know that I had to go this way due to problems removing the 1098 backplate. It works like a dream! Now all I have to do is sort out the leak in the cooling system and put her back together!

Post by **rayofleamington** » Mon May 15, 2006 6:54 pm

Just to let you know that I had to go this way due to problems removing the 1098 backplate.

Many thanks for the feedback!! Now I know that I wasted 2 hours in the freezing cold last december changing the backplate when fitting a 1098 gearbox

but at least I know better for next time.

Post by **bmcecosse** » Mon May 15, 2006 9:17 pm

How can there be a problem removing the backplate ? Very few bolts hold it on - and a dowel or two. Nothing magic about it!
Anyway - so you now have 948 engine with thin backplate on a 1098 gearbox - using the 1098 flywheel and clutch ?? Yes ?

Post by **Onne** » Mon May 15, 2006 10:29 pm

it is a lot of trouble if it is freezing. Any bolt is hard to do when your fingers want to fall off, and try to get into the house.

Onne

Post by **bmcecosse** » Tue May 16, 2006 10:50 am

It's not freezing in Wiltshire - is it ?? Tropical compared to écosse -land I should think !!

Post by **pskipper** » Wed May 17, 2006 6:37 am

The problem was completely rounded nuts holding the flywheel on. Fortunately the spare one I had was a 1098 one so it's 948 engine with 1098 flywheel and clutch!