11 BMW 1983 R80ST Remove, Inspect, Install Oil Pump

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.

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

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.

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.

Oil Pump Rotors Marked With "F" For Front Face

Oil Pump Rotors Marked With “F” For Front Face

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

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.

Outer Rotor Inspection-Minimal Scoring

Outer Rotor Inspection-Minimal Scoring

Outer Rotor Inspection-Rear Face Has Some Scoring

Outer Rotor Inspection-Rear Face Has Some Scoring

Inner Rotor Inspection-Minimal Scoring

Inner Rotor Inspection-Minimal Scoring

Inner Rotor Inspection-Lobes Have Minor Scoring

Inner Rotor Inspection-Lobes Have Minor Scoring

Inner Rotor Inspection-Rear Face Has Some Scoring

Inner Rotor Inspection-Rear Face Has Some Scoring

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

Oil Pump Measurements-They Are All Good

Oil Pump Measurements-They Are All Good

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

Here some pictures from the 1983 R80ST work.

Old (Left) and New (Right) Oil Pump Cover O-ring

Old (Left) and New (Right) Oil Pump Cover O-ring

Engine Assembly Lube With Moly-Graphite

Engine Assembly Lube With Moly-Graphite

New Oil Pump Cover O-ring Installed With Engine Assembly Lube On The Face

New Oil Pump Cover O-ring Installed With Engine Assembly Lube On The Face

Oil Pump And Engine Housing Coated With Engine Assembly Lube

Oil Pump And Engine Housing Coated With Engine Assembly Lube

72 INCH-Lbs Torque For Front Cover Bolts - NOT FOOT-Lbs!!!!

72 INCH-Lbs Torque For Front Cover Bolts – NOT FOOT-Lbs!!!!

Torque Oil Pump Cover Bolts To 72 INCH-Lbs NOT FOOT POUNDS!!!

Torque Oil Pump Cover Bolts To 72 INCH-Lbs NOT FOOT POUNDS!!!

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