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Home >> Mercedes Benz >> 1987 >> 300SDL >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Diesel >> Operation >> Governor

Fuel Injection System - Diesel: Operation: Governor

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The governor controls idle and maximum RPM. Internal design enables governor to have no effect on pump operation during normal operating speed range.

Through governor action, engine RPM is held constant at idle speed, regardless of engine operating conditions. At 5000-5100 RPM, governor limits RPM by pulling main rack back until balance exists between engine RPM and fuel delivery.