a bit of clarification on M20 flywheel/clutch conversion

[roguetoaster]

Don't bother swapping pinions if you don't need to. M20 starter is nearly the same weight IIRC. Most any TOB will work, you don't need the M20B23 specifically.

[Ziai]

bump. any news or new findings in m42 clutch mod department?

Got 1988 E30 m40, swaped m42 engine.
Original gearbox, I suppose it's Getrag 240

m20 flywheel (323i single mass one is what am really after as it's lightiest)
m20 clutch, pressure plate (either from 323i or 325i)
m20b23 throw out bearing
m20 (ANY) FW bolts

spacer taken of m42 FW
m20 (late version??) starter (or a pinion gear to use on m42 starter - which is lighter and that's what im going to do i guess)

once again. is that going to fit on my swapped engine? perhaps there are some news on this subject since the 2012 :)

[roguetoaster]

Yep, it's 50/50. To save time you can get both pilot bearings. The last Sachs clutch kit I got had both clutch alignment tools in it, however the very first one I got didn't have both of them.

Basically, have the parts, because it's really frustrating when you are trying to shove a transmission in place and it just won't go, and you've double checked everything (except the pilot bearing ID).

[jwal]

Ok cool, 50-50 chance then haha. Thanks so much for all the information :)

[ForcedFirebird]

Yes. Only 2 sized BMW bearings AFAIK. Large and small diameters. I have 2 sized clutch tools, never saw an odd one to this day and I've work on these cars daily at my shop for several years.

[jwal]

The same small diameter bearing that is used with some of the g240s?

[ForcedFirebird]

I am going to measure mine so I can know for sure. I hope its the larger one so the m20 clutch tool fits :P

Getrag 260 has the small diameter bearing.

[jekas619]

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[jwal]

I am going to measure mine so I can know for sure. I hope its the larger one so the m20 clutch tool fits :P

[brads2002]

Interesting. I didn't know there were 2. Mine has the larger one for sure.

[roguetoaster]

^
Exactly. For reference, two different M42 G240s, although it's a bit hard to see the comparison:

[ForcedFirebird]

yes the M42 bearing has a wider center so while the M20 tool will fit the spline it will not work to align it correctly.

Not all of them. ;)

The time you would need a different tool would be if you changed your transmission since the bearing has to match the trans. A lot of kits don't come with the tool.

[brads2002]

yes the M42 bearing has a wider center so while the M20 tool will fit the spline it will not work to align it correctly.

[jwal]

Yeah, I saw that too. Just one more thing to check I suppose

[roguetoaster]

Be aware that if you are using an M42 G240 there are two different pilot bearing sizes.