Install the car on a lift, brake it with a parking brake and disconnect the mass terminal from the battery. Unscrew the drain plug and drain the oil from the engine crankcase into the prepared vessel.
Remove the protective plates and the engine mudguard by first unscrewing the fastening screws. Loosen the engine mount nuts. Install a cross member on the car for hanging the A.70526 engine and hang it out.
Unscrew the crankcase mounting bolts and remove the crankcase together with the gasket. Unscrew the mounting bolts and remove the oil pump.
Install the oil pump in the reverse order of removal. At the same time, the oil crankcase gasket is replaced with a new one. After final assembly, engine oil is poured into the crankcase.