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Operating interior lever will not open exterior lever. No source besides experience, though.


A good mechanic can listen to a noisy pump with a stethoscope and tell whether it is cavitating, has a broken impeller blade, or bad shaft bearings. But the proof is always removal and disassembly. Once the pump is removed, then the mechanic can tell by spinning it by hand whether the bearing balls or races are pitted, and by shaking the drive shaft back and ...

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