Removing the ignition distributor (see Replacing the ignition distributor).
Remove the oil pump drive gear (see Replacing the oil pump drive gear).
We remove the fuel pump with a heat-insulating gasket and a pusher (see Fuel pump replacement).
Remove the oil pump drive sprocket (see Camshaft Drive Chain Replacement).
key «on 10» unscrew the two bolts securing the thrust flange of the roller...
...and remove the flange.
We take out the drive roller from the cylinder block.
Install the new roller in the reverse order.