THERE SEEMS TO BE SOME CONFUSION ABOUT AERO S1 STEERING PUMPS... THE S1 AERO WAS ORIGINALLY FITTED WITH A MECHANICALLY DRIVEN HYDAULIC PUMP. THE PUMP WAS DRIVEN BY A DOG TYPE COUPLING WITH A MINUTE KEYWAY WHICH WAS TOTALLY UNSUITABLE FOR THE FORCES APPLIED VIA THE BOTTOM CRANK PULLEY. AEROS'S WERE THEN MANUFACTURED WITH AN ELECTRO HYDRAULIC PUMP FROM THE NEW MINI WHICH SOLVED THE PROBLEM OF COUNTLESS EARLY AERO S1 POWER STEERING FAILURES....I KNOW BECAUSE I'VE JUST FITTED ONE ON MY 8000 MILE AERO....IF YOUR MECHANICAL PUMP FAILS ..YES YOU CAN STILL DRIVE IT AND WOULD BE OK AT HIGHER SPEEDS ,BUT NOT VERY EASY TO STEER AT LOW SPEEDS..IT MAY ALSO MAKE A GRINDING NOISE AS THE SHAFT TURNS IN THE BROKEN COUPLING WHICH IN TURN RUINS THE PUMP SHAFT .MY ADVISE WOULD BE TO CHANGE IT FOR THE ELECTRO HYDRAULIC PUMP AT THE NEXT SERVICE WHEN THE WINGS ARE OFF ,DON'T EVEN THINK ABOUT RENEWING THE COUPLIG IT REALLY IS A BADLY ENGINEERED EFFORT ,THATS WHY MORGAN SWITCHED TO ELECTRO HYDRAULIC DRIVE ENGIEERED BY BMW..NEED I SAY MORE ... I AM STILL BAFFLED ,WHY MORGAN DID NOT RECALL ALL S1 AEROS FITTED WITH THEIR MECHANICAL PUMP ON SAFETY GROUNDS .....SIMONG
