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oil pump techie question ALL

posted by  Rhys on  Wed Mar 9 00:35 CST 2011
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last visit: Tue Nov 20 10:22 CST 2012
[RELATED]

The advantage is that the B21 ( and B23 ) pumps use a plunger style relief valve, that centers the spring and prevents wear on the side of the spring. B20 and B18 pumps used a ball which allowed the spring to wear on the recess in the aluminum housing ( silicon crystals in the aluminum I suspect - George will know for sure )and the springs sometimes snapped, after losing tension of course, and lowering oil pressure. As to the gears, they are the same as far as I can tell.
I've done mod several times. It also meant I could use the IPD pump springs which have not been available for the ball type relief valve for many years.





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