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Got it. The Bosch manual only referenced 0.1 mm shims so that was the value I was basing it on. The manual states a 0.1 mm increase in shim thickness will increase system pressure by 0.15 bar.
Where do you find the shims nowadays? I did some Internet searching and the only thing I could pull up was SMC sells a fuel distributor rebuild kit that includes “shims “but it doesn’t mention how many or the thickness.
So I wanted to know where I was starting from before just adding shims, I wanted to see what was already in there. I pulled the screw plug on the distributor and found that there are already three shims in there. Two 0.4 mm and one 0.1 mm. For a total shim thickness of 0.9 mm. So with the 3 shims already I am still currently getting a low system pressure of 4.3 bar.
Is this too many? And would it be advisable to add additional shims on top of these? Again per the Bosch manual just to get into the range I would need to add at least another 0.2 mm.
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1974 911 Targa
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