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Primary fuel pressure regulator - Is disassembly possible?

Started by raueda1, 01 November 2022, 06:59 PM

raueda1

Quote from: Randys01 on 05 November 2022, 10:39 PM"The spring isn't really doing anything except keeping the needle in position".

Not quite right mate.......the spring and the shims are the only things doing the work!!  The O rings are passive in the scheme of things. By adding /reducing the no of shims, they are tensioning the spring. More tension, higher fuel pressure etc.
We're talking about different springs.  You refer, I think, to the larger spring inside the piston.  I refer too the small spring on the valve pin shaft. I guess technically the small one is contributing something but it's a tiny fractions of what the larger one is doing.
-Dave
Now:  1976 6.9 Euro, 2015 GL550
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

raueda1

Quote from: Randys01 on 05 November 2022, 10:39 PM"The spring isn't really doing anything except keeping the needle in position".

Not quite right mate.......the spring and the shims are the only things doing the work!!  The O rings are passive in the scheme of things. By adding /reducing the no of shims, they are tensioning the spring. More tension, higher fuel pressure etc.
We're talking about different springs.  You refer, I think, to the larger spring inside the piston.  If so, then yes.  But I refer too the small spring on the valve pin shaft. I guess technically the small one may be contributing something but it's a tiny fraction of what the larger one is doing.  And the small one isn't adjustable in any obvious way.
-Dave
Now:  1976 6.9 Euro, 2015 GL550
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0