As I plan to replace the rear main seal, that is the rear oil seal on the crankshaft, inspect the oil pump and replace the oil pump cover O-ring, I need to remove the flywheel. On 1981 model year (the 1981 model year started in September 1980) and later models, the flywheel is also called the “Clutch Housing”, (part# 21 21 1 338 722).
I previously removed the airbox, transmission and the clutch so I can access the flywheel. You can see how I do that work here.
- 13 BMW 1983 R80ST Remove Air Box & Pulse Air System
- 23 BMW 1983 R80ST Remove Transmission
- 21 BMW 1983 R80ST Remove Clutch
The flywheel on the 1981 and later models (the 1981 model year started in September 1980) is different from the earlier models. It is lighter, for one thing and is mounted differently on the rear nose of the crankshaft. The procedure for removing the earlier flywheels (before September 1980) is different as shown in these documents.
The flywheel on the 1983 R80ST is the same as the one on the 1983 R100RS. I show how I removed the R100RS flywheel here. I’ll link to sections of this document as appropriate.
Here is a link to a document showing how I do this work and a video summary.
VIDEO: 1983 BMW R80ST Remove Flywheel