Changing A Gearbox

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N3M
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Post Tue Feb 22, 2005 1:48 pm

Hi all,

Basically my 5 series uses the M40 block hence why im hoping you guys can help. basically a "synchro" or something has broken on my 4th gear. So im in the middle of sourcing another m40 gearbox. Will a gearbox from a 318iS fit aswell as a normal x18i?

And has anyone got any tips on me removing this myself, ive done a headgasket etc on my old cars(so im feeling up for the challenge :P ) but never a gearbox.

Cheers Guys!
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E30Adam
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Post Tue Feb 22, 2005 1:51 pm

Gearboxes are easy especially on a 4-pot.

The iS gearbox will fit the "i" block, they have the same bellhousing bolt configuration.

Basically you need to undo all the bolts around the bell housing, undo the prop from the output shaft, undo the clutch slave cylinder hose, undo the selector rod then support the 'box with a jack and remove the gearbox mounts and lower it down.

I can't really think of anything you might get stuck with. If you've managed a head gasket then this should be no trouble at all.
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Demlotcrew
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Post Tue Feb 22, 2005 1:59 pm

318is BOX WILL NOT FIT A M40 CAR!

Andrew
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Geeman
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Post Tue Feb 22, 2005 2:12 pm

Nice advice Andrew...
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E30Adam
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Post Tue Feb 22, 2005 2:16 pm

Demlotcrew wrote:318is BOX WILL NOT FIT A M40 CAR!

Andrew
Why not, aren't the bellhousings the same?
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N3M
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Post Tue Feb 22, 2005 2:18 pm

Cheers for the advise Adam, with this in mind ill crack on with it with alot more confidence.

Still trying to source a gearbox at the mo...

Mixed views on the iS gearbox fitting... can anyone else shed a little more light on the subject?

Cheers for this!!
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Karan
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Post Tue Feb 22, 2005 2:22 pm

i believe the iS box has a longer output shaft and a shorter prop is required to compensate...

stock m40 box is ure best bet


Karan
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N3M
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Post Tue Feb 22, 2005 2:30 pm

Cool!
ill keep an eye out for one then, and tell the guy with the iS gearbox fs.

You guys recon i should change the clutch or the flywheel whilst im here just for piece of mind... not that i feel anything is wrong with whats there, just ive not known it to have been changed for a while.
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Demlotcrew
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Post Tue Feb 22, 2005 3:41 pm

If you put on a new pressure plate it will make the clutch nice and light.

also find a 89 M40 with a lighter fly wheel if you want to ive it a little boost.

Andrew
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