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Old 20-05-16, 08:09 PM   #1
crank
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Default Lister J fuel oil pump

Hi Having a few problems with my pump. should the springs be bigger diameter then the ball baring?so as not to keep it pressed down on the up stroke. suction .any help would be appreciated

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Old 20-05-16, 08:12 PM   #2
Lister M
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the springs have to be slightly smaller than the ball. They could be tapered i.e. small for the ball end and larger at the support end.

Martin P
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Old 20-05-16, 08:26 PM   #3
crank
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Default pump

Thanks you. what about the length of the spring should it be just Short as not to press the ball in to its seat .and the the bearing seat with the slot. is it on the flow or the return.side sorry for all the questions.:whistle

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Old 21-05-16, 08:42 AM   #4
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I must be having brain fade, the only spring in the pumps is to push the piston/plunger back up, the steel/brass balls float under the unions so that when the plunger goes down pressure causes the inlet ball onto its seat and the outlet opens passing fluid and when the plunger goes up the reverse happens sucking in fluid.

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Old 21-05-16, 05:26 PM   #5
crank
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Thanks martin for your help
I think the packing gland my be were i am going wrong
could be drawing in air.
cheers
crank
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