CHINESE WATER PUMPS---LOOSE IMPELLER AND OR PREVENTION

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THE PUMPS I HAVE HAD A LOOK AT HAVE AN ALLEN SCREW HOLDING THE IMPELLER ONTO THE CRANK-SHAFT.

ON SOME MODELS, THE PLASTIC WASHER UNDER THE HEAD OF THE ALLEN SCREW IS TOO SOFT AND SQUASHES OUT, LEAVING THE IMPELLER LOOSE, WHICH SERIOUSLY SOUNDS LIKE A BIG-END KNOCK. ON OTHERS THE PLASTIC WASHER IS HARDER BUT THE ALLEN SCREW TIGHTENS DIRECTLY ONTO THE PLASTIC WASHER COME SEALER, THIS COULD PRESENT A PROBLEM WHEN THINGS WEAR A BIT, FURTHER DOWN THE TRACK. I.E. LOOSE IMPELLER.

I HAVE MADE USE OF STAINLESS STEEL WASHERS BY INSERTING THEM DIRECTLY UNDER THE HEAD OF THE ALLEN SCREW AND USING THREAD LOCKING COMPOUNT ON THE SCREW TO CRANKSHAFT UNION, EITHER LEAVING THE PLASTIC WASHER ON, UNDER THE STAINLESS ONE OR BY REMOVING THE PLASTIC WASHER ALTOGETHER AND USING RTV SEALANT UNDER THE STAINLESS WASHER AND UNDER THE HEAD OF THE ALLEN SCREW.

ANOTHER SOLUTION TO GET RID OF THE PLASTIC WASHER IS TO USE AN OVER SIZED DRILL AND MAKE A SMALL RELIEF IN THE IMPELLER THEN USE AN O-RING UNDER THE STAINLESS WASHER AND SOME THREAD LOCKING COMPOUND ON THE ALLEN SCREW.

TO PERFORM THIS ONE YOU HAVE TO BE VERY CAREFUL WHEN MAKING THE RELIEF IN THE IMPELLER, AS TOO MUCH OF AN ARRIS HERE WON'T LET THE O-RING CREATE A PROPER SEAL TO STOP LIQUID SEEPING IN AROUND THE SCREW HEAD.

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