How to calibrate the mechanical diesel fuel injectors


Adjusting the injector nozzle valve opening pressure is an easy operation, by installing the shims having the appropriate thickness to load the spring consequently.

Marbed shim kits (9791, 9792 and 9372) consist of excellent quality pressure shims of different sizes as shown in the following images

Then the injector should then be tested on a pop tester. Any good diesel shop will have Marbed 9375

Marbed 9375 pop tester
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