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.
Grungy Oil Pan Was Painted Orange By Previous Owner
Oil Caked Oil Pan And Bottom Of Transmission
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.
Parts
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).
Video
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.
Oil Pan After Vapor Blasting By Vintage Twins In Arvada, CO.
Here are some pictures from the 1983 R80ST work.
Checking Oil Pan Bolt Threads For Any Stripped Threads
Removing Oil Pump Suction Funnel Screen Bail
Oil Pump Suction Flange Bolts & Washers
Oil Pump Suction Flange Gasket Goes Between Suction Funnel And Flange
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.
Oil Pan On Glass Plate To Determine If The Mating Surface Is Flat
Checking Flatness Of Oil Pan Mating Surface With 0.002″ Feeler Gauge
New Pan And Oil Pump Suction Flange Gaskets
New Oil Pump Suction Flange Gasket
Attach Suction Flange With Blue Loctite On The Bolts
Torque To 72-75 INCH-Lbs, NOT FOOT-Lbs
Attach Oil Suction Funnel Screen With Wire Bail
Oil Pump Suction Funnel & Screen Installed
Oil Pan Gasket Only Goes One Way Due To Cut Out At Top
Hang Oil Pan And Gasket With Two Bolts At The Top
Torque Oil Pan Bolts Starting At The Center And Work Outward
Torque Oil Pan Bolts Across From Each Other
The vapor blasted oil pan looks very nice mounted on the engine block.
All Done
All Done
One of your best my friend. Keep up the good work.
Jerome,
Thank you. Hope to see you again one day.
Best.
Brook.