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Old 09-22-2014, 03:15 PM   #1
BigAldo OP
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New flywheel/original clutch pack orientation...

1989 R100 mono.
So I've got a new flywheel to install. I carefully marked the assembly of the old parts. The two halves of the old clutch assembly have no original markings left to give a hint as to how it went together to maintain balance with the original flywheel. No marks on the old flywheel either. The only thing I'm sure of is the relative position of the front and back clutch pressure plates when fitting it to the new flywheel.

The new flywheel has a paint mark which (I think) shows the heaviest point. The only reference point I can figure is TDC on both the new flywheel and the original clutch pack. Is that the way to assemble everything? Line up the TDC's?
Seems to me to be a one in three chance of getting the balance right between the new flywheel and the old clutch pack which doesn't fill me with confidence... Any advice would be appreciated.
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BigAldo screwed with this post 09-22-2014 at 03:25 PM
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Old 09-22-2014, 06:55 PM   #2
bmwrench
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The marks on the flywheel, pressure plate and pressure ring are supposed to be arranged as closely as possible at 120 degrees from each other. This is usually impossible; get as close as you can, and put it together.
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Old 09-23-2014, 10:33 PM   #3
BigAldo OP
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Thanks BM.

I'm waiting for the heads coming back from the reconditioners. I think to be safe I'll put the engine together without the gearbox to make sure there's not too much vibration before going any further.
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Old 09-24-2014, 01:36 AM   #4
chasbmw
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I think that with a lightweight flywheel it does not really matter, when buying new clutch parts they have had drillings that suggest that the clutch components have been balanced.
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Old 09-24-2014, 03:34 AM   #5
ME 109
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I've never worried about specifically positioning components, and haven't experienced anything that suggested I got it wrong.
I have however done other airhead things that definitely let me know I got it wrong.
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Old 09-24-2014, 08:22 AM   #6
BigAldo OP
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Thanks guys. I'm probably overthinking things (again)...
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Old 09-24-2014, 06:20 PM   #7
bmwrench
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Since BMW chose to put paint dots on them, why not use them?
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Old 09-24-2014, 09:25 PM   #8
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Old 09-24-2014, 11:33 PM   #9
BigAldo OP
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Cy. I was aware of the paint marks and looked for them. The new flywheel has a clear mark, and also has a drill point which looks like part of the balancing process.

The two halves of the clutch assembly have no visible marks left. Everything is just a nice even shade of rust. I marked the position of the old parts, so I know the two clucth halves are back together the same way they came apart, relative to each other.

But with no original markings, on them, or the old flywheel, I can't tell where these should be positioned relative to the new flywheel, for balancing. I've put them back together and lined up all the TDC's which I also marked before disassembly. But this assumes that the heavy point on the old flywheel is the same place as the new one.
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Old 09-25-2014, 01:41 AM   #10
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Quote:
Originally Posted by BigAldo View Post

But with no original markings, on them, or the old flywheel, I can't tell where these should be positioned relative to the new flywheel, for balancing. I've put them back together and lined up all the TDC's which I also marked before disassembly. But this assumes that the heavy point on the old flywheel is the same place as the new one.
BigAldo, this stuff is reserved for those shitfaced times around the campfire.
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