I think i f'ed up pretty bad

[B3M2W5]

Ok n the back of the motor where the flywheel gets bolted on, there is a little collar that sticks out not sure really what it is for maybe just for alignment? Well i stuck my flywheel on and looked at it and thought i had it right and all lined up. I guess I missed juged the size of the hole I used on the collar, i started wrenching it down to torque spec and then when I was done I looked at it. It seemed off set and not right, I took it back off and relized why.
I have crushed that little collar, i know this sounds bad. What i would like to know is how bad did i fuck up! Is this like some little thing i can pull out and get a new one or did i just ruin my 3g investment. I feel really stupid right now plz dont make fun of me i am not looking for critisizm im looking for help plz.
Also I noted that when i took the old flywheel off, or rather the flex plate as it was an automatic motor. There is what i would call a shim or spacer for a flywheel or flexdisc. Its just a circular plate with a bolt pattern the same as the flywheel with the middle cut out is this nessesary for the Manual flywheel or was it just an added spacer for the old flex plate of the automatic trans?

[Van Westervelt]

http://www.realoem.com/bmw/showparts...51&hg=11&fg=20

Talking about part #3?

[B3M2W5]

Yah but i seems to me like it wouldnt come out maybe i just crushed it in there pretty good and i wasnt sure where to look i guess i should have tried the m50 sense thats what it was on haha.

[matt]

What flywheel are you using? Some require the gall plate (big washer with 9 holes in it) and some don't

[B3M2W5]

M20 single mass i belive or thats what i was told i was being sold

[matt]

I think you probably need it. It may not be that important. Definitely remove the crushed dowel and replace it with a new one.

[Beej '86 325es]

My thought is, it's just a quick reference for alignment. Dowel or no dowel, just make sure that the corresponding hole matches up on the flywheel. The stretch bolts are what's going to hold it on there.

[BigD]

My thought is, it's just a quick reference for alignment. Dowel or no dowel, just make sure that the corresponding hole matches up on the flywheel. The stretch bolts are what's going to hold it on there.

^^^ +1

[matt]

Wrong. Replace that dowel, it's very important.

[Rigmaster]

Wrong. Replace that dowel, it's very important.

Why?

I mean, sure it's important, but as long as you are careful to line up the flywheel in the correct way- it doesn't serve any other function AFAIK.


Please share if you know something else about that dowel that has not been mentioned.


;)

[matt]

Sure... think about the job of a bolt. It clamps things together. What is a bolt NOT for? Resisting bending. Having a threaded fastener loaded in single shear is a big no-no. The dowel fixes that problem.

Another example... Look at a clutch pressure plate/flywheel connection... 6 bolts to clamp them together + 3 dowels to keep them spinning together and take the torsional load off the bolts. That's what the dowel on/in the crank does also.

[mattdk318i]

Sure... think about the job of a bolt. It clamps things together. What is a bolt NOT for? Resisting bending. Having a threaded fastener loaded in single shear is a big no-no. The dowel fixes that problem.

Another example... Look at a clutch pressure plate/flywheel connection... 6 bolts to clamp them together + 3 dowels to keep them spinning together and take the torsional load off the bolts. That's what the dowel on/in the crank does also.

I agree, Wait the 2 days for a new one from the stealer

[BigD]

C'mon, that little dingaling isn't designed to hold the torque of a 200+ ft lb engine. The driveshaft and halfshafts don't have any dowels and they do just fine. I'm not saying he shouldn't do it but if it proves to be an extreme pain in the ass (along the lines of having to pull the crank to replace it), I seriously don't see the big deal.

[mattdk318i]

its more of a cotter pin type situation. Its not meant to hold load, But it keeps part from shifting.
But go without it and see what happens

[LINUS]

If bolts weren't meant to be used as anti-shear/side loaded fasteners then when you see a industrial structure using bolts then that would be an incorrect use of them.

I agree with D & others, the little dowel isn't meant to take any load. If it was, you'd see wear in that area when you pull a used one, and I'd expect my aluminum one to have a steel collar to contact the pin if that was supposed to be a load point.