Saginaw pump valve shims? Mopar muscle "Pump it down" article by Richard Ehrenberg questions.

[HAHNAGON]

I tried the "pump it down" article for the saginaw pump. The shim idea that richard ehrenberg put out. I had bought a new saginaw pump, new borgeson gearbox, cooler, the upgraded linkage, etc. All of that have been working just fine, but still feel like the over powered factory gear box. No slop, just over boosted. Can turn with one pinky finger. I tried the shim idea this weekend, emptied tank, added shim, bleed the system and it really didn't help. Maybe a little?? Either way, now the saginaw makes a whine. The more rpm, the louder the whine. I can't rev engine over 3500 without the pump sounding like its ready to go out. I only added the about .07 "shim. Any advice? Do I need a different model saginaw?

 

[HAHNAGON]

This "Pump It Down" article

 

[Kern Dog]

Advice? Yeah. Take the shim out.
You may feel overboosted because of your alignment.

 

[Demonic]

When hydraulic pumps whine, often it's from an air leak. Does the fluid look like it's foamy?

 

[Geoff 2]

0.07" shim? That is very thick. When you add shims, you reduce pressure. The opposite of what you would expect. Rarely to these pumps need to be modified. While the pressure is regulated by the above valve, the flow volume is regulated by the size of the hole in the pressure hose exit fitting in the bottom of the pump.

 

[Nxcoupe]

Usually when it whines, it's a sign of restriction in the system.

 

[HEMIB]

I tried changing shims to reduce the pressure without success ended up using the ford pump which I think is around 850 psi rather than 1350 psi

 

[moparedtn]

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