I’ve removed the airbox, transmission, clutch and flywheel to gain access to the oil pump. You can see how I did 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
• 11 BMW 1983 R80ST Remove Flywheel

I’ve published documents on removing, inspecting and installing the oil pump on other projects. Here are links to those documents.

• 11 BMW 1977 R100RS Replace Rear Main Seal & Oil Pump Cover O-Ring
• 11 BMW 1983 R100RS Remove & Inspect Oil Pump
• 11 BMW 1983 R100RS Install Rear Main Seal, Oil Pump Cover & O-ring

Since the 1983 R80ST engine is similar in many ways to the 1983 R100RS, I will link to the 1983 R100RS documents as appropriate in this document.

Video

Here is a short video that summarizes how I do this work.

VIDEO: 1983 BMW R80ST Remove And Inspect Oil Pump

Remove Oil Pump Cover

I show how to do that on the 1983 R100RS.

• 1983 R100RS: 11 BMW 1983 R100RS Remove & Inspect Oil Pump

Oil Pump Measurements

Before I remove the inner and outer rotors, I put a “F” on the front face using a sharpie so I install the parts the same way they come out.

I show how to make the measurements on the 1983 R100RS.

• 1983 R100RS: Oil Pump Measurements

Inspection and Condition Assessment

I visually inspect the oil pump inner and outer rotors for wear. There is some scoring on the faces of the rotors caused by hard bits that went through the oil pump. But there are only a few of them. The tip of the inner rotor lobes are not damaged.

The table below shows the measurements I took of the oil pump parts. All the measurements where with the acceptable range.

Based on the visual inspection and the measurements, I conclude the pump is serviceable so I will reinstall it.

Install Oil Pump

I show how to do this on the 1983 R100RS

• 1983 R100RS: Install Oil Pump and Cover O-ring

Here some pictures from the 1983 R80ST work.