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Last time I saw one of those testers was in Marathon Fla in the keys working for Mercedes. We found that if you replaced the springs the pressures and spray patterns were as new. I think they can be shimmed but that memory is 32 years old. The higher the pressure the peak power will drop slightly but the better atomization will improve efficiency. Most of the bad smoking diesels only needed new springs to get the pressure in specs, the smoke was due to poor atomization. We used redline in the tester to get them clean.
regards
mech
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