11 BMW 1983 R80ST Replace Oil Pan & Oil Pump Suction Flange Gaskets

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

Grungy Oil Pan Was Painted Orange By Previous Owner

Oil Caked Oil Pan And Bottom Of Transmission

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.

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.

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

Checking Oil Pan Bolt Threads For Any Stripped Threads

Removing Oil Pump Suction Funnel Screen Bail

Removing Oil Pump Suction Funnel Screen Bail

Oil Pump Suction Flange Bolts & Washers

Oil Pump Suction Flange Bolts & Washers

Oil Pump Suction Flange Gasket Goes Between Suction Funnel And Flange

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

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

Checking Flatness Of Oil Pan Mating Surface With 0.002″ Feeler Gauge

New Pan And Oil Pump Suction Flange Gaskets

New Pan And Oil Pump Suction Flange Gaskets

New Oil Pump Suction Flange Gasket

New Oil Pump Suction Flange Gasket

Attach Suction Flange With Blue Loctite On The Bolts

Attach Suction Flange With Blue Loctite On The Bolts

Torque To 72-75 INCH-Lbs, NOT FOOT-Lbs

Torque To 72-75 INCH-Lbs, NOT FOOT-Lbs

Attach Oil Suction Funnel Screen With Wire Bail

Attach Oil Suction Funnel Screen With Wire Bail

Oil Pump Suction Funnel & Screen Installed

Oil Pump Suction Funnel & Screen Installed

Oil Pan Gasket Only Goes One Way Due To Cut Out At Top

Oil Pan Gasket Only Goes One Way Due To Cut Out At Top

Hang Oil Pan And Gasket With Two Bolts At The 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 Starting At The Center And Work Outward

Torque Oil Pan Bolts Across From Each Other

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

All Done

All Done

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