1098 gearbox to 948 engine

Post by **fsk658** » Mon Apr 03, 2006 8:48 pm

Could you please tell me if the 1098 gearbox is a straight swop into a 1954 split screen 948 engined moggy Thanks John

Post by **bmcecosse** » Mon Apr 03, 2006 8:50 pm

Yes - except that age of car should (I think) have an 803cc engine - so maybe it's not standard anyway!

Post by **rayofleamington** » Mon Apr 03, 2006 9:54 pm

Very nearly a straight swap (most comments based on the 948 engine having a 948 clutch fitted on it, but this may not be the case

The 948 engine has a different clutch to the 1098 and subsequently the 948 gearbox has a different thrust bearing (on the release arm bolted through the bellhousing).
You'll need to check whitch combination of thrust bearing is required for whichever clutch you'll be using with the 1098 gearbox (I presume it needs the 948 thrust bearing when keeping a 948 clutch...)

Most likely is that the release arm (and thrust bearing) is left with the gearbox so the 1098 box probably has the 1098 thrust bearing on it at the moment.

Things get even more complicated if you have a SII gearbox currently running on the 948cc engine! Who knows what parts will be there in this case!

The last thing you want to do is fit it all and only find out about the clutch release problems whaen you start driving!! Therefore best to make sure it all works together before wasting a lot of time.

Post by **bmcecosse** » Tue Apr 04, 2006 8:42 pm

Hmm - didn't know there was any difference in the thrust bearing - thought they were the same! Are different ones listed as spares ?

Post by **Onne** » Tue Apr 04, 2006 9:16 pm

There are two sizes Roy, one for the 918/803/948cc and one for the 1098

Post by **brixtonmorris** » Wed Apr 05, 2006 11:06 am

split screens cannot take the later gearboxes becauses of the floor on the splitty.
it may need to be cut, to accommodate the remote gear stick on the 1098.

Post by **Cam** » Wed Apr 05, 2006 1:42 pm

They also have a different clutch throw arm (948 - 1098).

Post by **Onne** » Wed Apr 05, 2006 4:37 pm

I have asked this before, can't the remote be removed (or machined off), so it can fit in the splitscreen?

Post by **brixtonmorris** » Wed Apr 05, 2006 5:56 pm

You can onne, but its a job involving a large lathe, that is able to hold the split screen gearbox rear gear stick casing. A Colchester 2000 lathe with 4 jaw chuck can do it, ive done it before. the split screen casing needs to be machined to accomadate the larger rear bearing of the 1098 gearbox.
+ a few other little details

Post by **paulk** » Wed Apr 05, 2006 5:59 pm

A Colchester 2000 lathe with 4 jaw chuck

Tee Hee I've got one of them

Post by **brixtonmorris** » Wed Apr 05, 2006 6:06 pm

ive got 3

+ others
if you have the large 4 jaw chuck you should start machining so we can get the 1098 into the split screen without cutting the floor.
you will need a nice long strong boaring tool too!

very nice lathes

Post by **Onne** » Wed Apr 05, 2006 6:07 pm

ok lot of work then