Hello Members  Have a quick question.  I picked up a new cast iron georotor  after market pump  many years ago. Getting ready to use it and noticed  it had no relief valve or spring in it.  Can anyone here tell me if spur gear pumps and georotor  use same valve and spring?  Have many gear pump cores but no georotors to compare. Thanks Cos

Thanks for quick replies Charlie and Ted. Will put nose to ground and look for a AL georotor pump. One I have has threaded plug on relief valve bore. Cos

Hello Members  I put up a question 7 months ago and would like to update it.  The cast iron georotor  pump I have is a aftermarket  republic  parts pump. I tried fitting a gear type pump bypass valve (or piston) into it, ( don't have a bore gauge small enough to measure bore) it was to large (OD .4965). Have another 292 with a AL factory pump, removed valve and it fit fine in cast georotor pump  (OD .493).  Length is 1.915 is  .030 less than gear pump valve (1.945). Al valve has 2 groves. Cast gear pump is smooth.  Trying to find a worn out AL georotor  to salvage the  valve from it. Have thought about having bypass bore honed and using gear type valve as plan B.