The oil pan was caked in grime and hardened oil when I got the bike, not to mention it was painted orange. So it’s time to clean that up and while I’m at it, replace the gasket the fits between the oil pump suction funnel and the flange on the engine block.
The oil pan and gaskets used on the 1983 R80ST are the same ones used on the 1983 R100RS that I previously rebuilt. This R100RS document shows how I do this work and I’ll reference it in this document.
- 11 BMW 1983 R100RS Replace Oil Pan & Oil Pump Suction Flange Gaskets, Get Oil Pan Mating Surface Flat
The parts include two gaskets, the oil pan gasket (BMW Part# 11 13 1 338 427) and the oil pump suction flange gasket (BMW Part# 11 41 1 265 258) that are included in the Euro MotoElectrics engine gasket kit (EME Part# GSK-EngineKit421).
Here is a short video summarizing how I do this work.
VIDEO: 1983 BMW R80ST Replace Oil Pan and Oil Pump Suction Flange Gasket
Previous Work On 1983 R100RS Applies To 1983 R80ST
Below are links to the 1983 R100RS document showing how I do this work.
- Getting Started
- Remove Oil Pan and Gasket
- Remove Oil Pump Suction Housing
- Remove Gaskets, Clean Mating Surfaces
- Install New Oil Pump Suction Flange Gasket and Suction Housing
- Measure Flatness Of Mating Surface
- How To Sand Oil Pan Mating Surface To Get It Flat
- Install Oil Pan and Gasket
Vapor Blast Oil Pan
I had the oil pan vapor blasted after I removed it to remove the orange paint and restore the finish. Vintage Twins in Arvada, CO did the work for me through their sub-division, Colorado Vapor Blasting.
Here are some pictures from the 1983 R80ST work.
The oil pan was not flat. One side and one-half of the front and rear edges were too high. So as I did on the 1983 R100RS, I used a glass plate and 400 grit wet/dry paper to get the mating surface flat so it will seal tightly against the oil pan gasket.
I also used some kerosene and a paint brush to clean out the engine case above the oil pan to get rid of any debris.
The vapor blasted oil pan looks very nice mounted on the engine block.