The rack is the final actuator link inside the inj pump. Similar to a rack and pinion. All of the pump barrels are geared to the rack so that through one action all delivery chambers change accordingly by rotation.
The pin acts as a dampener, at idle delivery, against the rack. It keeps engine vibrations from influencing delivery amount and causing an oscillation in engine speed.
Your problem sounds more like mounts as Mike said.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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