We remove the oil pump drive gear from the cylinder block (see Removing the oil pump drive gear).
On a carburetor engine, we remove the fuel pump with a heat-insulating spacer and a pusher (see Removing the fuel pump).
Remove the oil pump drive sprocket (see Removing the chain and sprockets of the camshaft drive of the carburetor engine, or Removing the injection engine camshaft drive chain and sprockets).
head «on 10» unscrew the two bolts securing the thrust flange of the roller to the cylinder block...
...and remove the thrust flange.
We take out the oil pump drive roller from the cylinder block socket.
Install the oil pump drive shaft in reverse order.