21 BMW 1983 R80ST Remove Clutch

Procedure

The clutch in this 1983 R80ST is the same as the one used in the 1983 R100RS that I rebuilt and converted to an RT model. You can see the procedure I used to remove the 1983 R100RS clutch here.

Avoiding Disaster

As I plan to remove the flywheel so I can replace the rear main seal on the crankshaft and the O-ring that seals the oil pump cover, I block the crankshaft from moving before I start work. I show how I do that in the R100RS clutch removal document.

I put the engine at top dead center and then block the flywheel from moving as shown in the pictures below. Refer to the link above for all the details.

Setting Engine To Top Dead Center

Setting Engine To Top Dead Center

6mm x 12mm Bolt In Face Of Alternator Allen Bolt

6mm x 12mm Bolt In Face Of Alternator Allen Bolt

Front Engine Cover Gap Confirms Crankshaft Is Immobilized

Front Engine Cover Gap Confirms Crankshaft Is Immobilized

NOTE:
If you are only replacing the clutch, you do NOT have to block the crankshaft to keep it from moving. Only if you remove the flywheel MUST you block the crankshaft.

Tools

You don’t need special tools to remove the clutch. That said, I like to use an electric impact driver to quickly remove the six clutch bolts with their star washers.

Electric Impact Driver

Electric Impact Driver

You can remove the clutch bolts with a ratchet wrench and Allen bolt driver as I describe in the R100RS clutch removal document.

Video

I created a short video showing how the removal of the R80ST clutch.

VIDEO: 1983 BMW R80ST Clutch Removal

I also created a video that summarizes how I removed the R100RS clutch.

Clutch Condition And Markings

I took pictures of the 1983 R80ST clutch showing the makings on it (which are the same as those I found on the 1983 R100RS) and the condition. It had debris between the pressure plate and front cover and is pretty rusty.

Balance Marks

These paint marks indicate the heavy portion of the clutch housing and the flywheel.

Clutch Housing Balance Mark

Clutch Housing Balance Mark

Flywheel Balance Mark

Flywheel Balance Mark

Clutch Housing Markings

These are the manufacturer, Fichtel & Sachs, markings on the clutch housing that faces you.

R80ST Clutch Housing Showing Markings

R80ST Clutch Housing Showing Markings

Clutch Housing Manufacturer Marks

Clutch Housing Manufacturer Marks

Clutch Housing Manufacturer Marks

Clutch Housing Manufacturer Marks

Clutch Housing Manufacturer Marks

Clutch Housing Manufacturer Marks

Clutch Removed

This shows the removed clutch assembly and the diaphragm spring.

Clutch Condition-Rear Side That Faces You

Clutch Condition-Rear Side That Faces You

Clutch Condition-Engine Side That Faces Flywheel

Clutch Condition-Engine Side That Faces Flywheel

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