Flywheel bolts

[Jozi]

Are these guys a one time only usable item? I've re-used them termporarily to get the engine running, they seemed to thread into the crank by only a few threads! I'm using a early m20b23 fly with a thick (2-3mm) ring, bolts are around close to 30mm long.

[maggspower]

They can be reused, but you must use thread lock.

There should be around 10mm of thread used, you're not using an auto spacer as they are thicker?

[Jozi]

Could be the spacer from the autobox! I was nearly sure I had it from when I got the flywheel though. Anyone know how thick it should be? Dad didnt feel to confident torquing them up to 110ish not with the little thread it was gripping.

[Rav335uk]

Just make sure they're torqued properly Brendan, I've re-used mine too.

[maggspower]

From memory, the manual is about 2mm thick, the auto is about 5mm

[Jozi]

I've an auto one so! And all the threadlock I used on them :p

[maggspower]

You will have to get it back off sorry

You cant mess about with a 7kg lump of metal rotating at 6000 rpm

Do you have a manual one?

[Jozi]

That was the whole reason I posted up! It's only fitted on temp basis till I find out the engine runs or not, still need to fit a clutch so I'll sort it then.

I'll have a look around for the right one and if I don't have it I'll get it machined down or see can I get one somewhere.

[Duke137]

2.5mm thick for the manual 'ring'

[Jozi]

Mines defo not 2.5mm, thanks.

[Duke137]

Auto ones I have seen are approximately double thickness, I have a couple of them I am going to knock down to 2.5 on the surface grinder. Auto ones also have a chamfered edge both sides. All of these have been facelift though, so I am unsure if the preface m20b23 ones may be different as the motronic/jetronic systems have a different flywheel.... ?

DanThe may know

[Jozi]

I think the only difference between the pre and post face lift is that the later has a bit of extra metal. Friend fitted one to his sport without any problems.

[DanThe]

The auto ring gear bolts are the shortest so you may have got those mixed up if you have the washer plate from an auto too

[Jozi]

Which are the correct bolts to get, I'm sure I don't have other bolts, early m20b23? M12x1.5x28 seems short, I'll measure mine but I'm nearly sure they are the same length, the bolts I used looked like they werent even threaded in 10mm going by the old locktight stuff.

http://bmwfans.info/parts/catalog/E30/2 ... _flywheel/


--- edit ---

M52 bolts are M12x1.5x50 so a bit longer but might be to long?

http://bmwfans.info/parts/catalog/E36/C ... _flywheel/

[DanThe]

M52 bolts are defo too long, 30mm sounds about right to me, the flywheel is only about 10-12mm thick where its bolted

[Jozi]

I'll get the callipers out and measure up before I order bolts, it should be ok the way it is for just running the engine.