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Please refer to Check Measure Adjust of the mechanical fuel injection publication, the first printing (4532.20). On page 37 Porsche notes Dont slip the expansion elements off the shaft. If the expansion elements or discs are mixed up, the warm up characteristics of the thermostat will be changed.
Also refer to Up-fixin der Porsche Vol 4, p38. Roger Channey states It is also possible that some thermostats were incorrectly calibrated at Bosch (this should probably read most )
This means that if the bellview springs are not facing each other the cones cannot expand against each other and change (or increase) their distance. Channey talks about adding shims 1/32 at a time to move the shaft to the front of the car to lean the cold start. Reversing one of the pair of belleview springs would move the shaft to the rear of the car but the net travel of the shaft due to temperature (all in at 140 degrees) would be less. If the net travel is less, It would start in a leaner cold start mode provided that the pump was re-calibrated in the warm mode.
PS: This is what I could dig up at a moments notice. Been at this stuff for forty years. I can't remember all the sources.
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