Hi, I assemble my rebuild 425 and want to overhaul the oil pump. The kit includes also the valve spring. But I'm stuck cause I don't know how to get the spring out of the body. It looks like there is kind of retaining ring? Didn't see such a construction before. Any hints? Thanks
Looks like a snap ring? https://www.rockauto.com/info/8/SE_224415_Ang__ra_p.jpg https://www.rockauto.com/info/850/EK20G__ra_p.jpg
it just pulls out. just push something that fits tight then pull out. its not a snap ring even though it looks like one
The spring? Yes, it limits the maximum pressure the pump will produce. As long as your oil pressure was satisfactory, you can leave the original one in there. You can also just buy a new pump. I see you are in Germany though.
Stock pumps don't make a lot of pressure, 35-40 psi is common. If you want more pressure, you can add some shims. Drive the original retainer further in and add some shims. Be sure the ID of the shims is at least as large as the ID of the original retainer so you don't reduce the flow. I don't recall the thickness of these shims, but the tang on the retainer is 1/4" below the pickup mounting surface.
