how does the oil pump work?

terret725

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Joined
Sep 29, 2005
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972
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berkshire mass
i hear every one say that when the pump goes bad it pumps more oil then normal. to me this makes now sence if its a pump and the shaft breaks the belst bad or somthing jamed it kept it from spining it souldnt be pumping any oil. the only thing i could think of is where it is hooked into the fule pump and the fule pump its self is pumping the oil and the "oil pump" just regulates the flow by letting so much oil by with every revolution. does any one have an asnwer to my question other then its just pumps more? im standing by my idea that a bad pump can not pump more then a good pump its defys every thing ive been tought about fluid pumps in my hydrolics class. also if it is a pump what kind of pump?(gear, gerotor,vane, piston etc...)
 
I tore apart one of my old Phazer pumps and I don't really see any way that it will pump wide open if it goes bad. It's a gear driven plunger pump. The gear and the plunger (which doesn't spin) have lobes on them. When the gear spins, the lobes make the plunger go up and down. If it seizes, it would probably strip a gear (unless it seized in the "up" position). And if it wears, it will pump less oil. I doubt that it would quit pumping completely, but I would hate to take a chance. The first time I blew my Phazer up, it was a bad oil pump (but it still used oil, slightly). I didn't tear it apart, just threw it away.
 


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