Oil Pump ReBuild

I re-assembling my 1929 oil pump. From my 'manual' it appears there

should be a 1/2" ball sitting on top of the piston shaft. That ball

was in the correct location when I took the pump apart.



There also appears to be a 3/8" ball shown below the piston shaft. I

do not have that ball on my pump.



Do these act as check valves, and are they both required?



Paul H
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