What Causes Engine Governor Faults

by Starlight Generator dieselgeneratortech

Instability of engine speed (engine hunting)

Possible cause

(1) Non-even fuel supply of each cylinder.

(2) Carbon deposit and fuel dripping at fuel nozzle.

(3) Lose connecting pin of the rack.

(4) The camshaft endply is too large.

(5) Lose flying-weight pin due to wear.

(6) The clearance between the control rack and the control gear is too large or there is burr between them.

(7) The control rack or throttle lever does not move freely.

(8) There is air in the fuel system

(9) The flyweight of flyweight seat does not open freely.

(10) Low speed is not set properly.

Correction

Let professional serviceman readjust the supply flow of each cylinder.

Let professional serviceman clean and repair the nozzle assembly, or replace the nozzle assembly.

Let professional serviceman repair it, or replace the fuel injection pump.

Let professional serviceman regulate it, or replace the fuel injection pump.

Let professional serviceman repair it, or replace the fuel injection pump.

Prime the fuel system.

Let professional serviceman repair it, or replace the fuel injection pump.

The engine can not reach rated speed.

(1) Permanent deformation of the governor spring.

(2) Not enough fuel supply from the fuel injection pump.

(3) The operation handle does not reach the max, speed position.

Correction:

Let professional serviceman repair it. Or the fuel injection pump.

Refer to fuel injection pump fault for troubleshooting.

Let professional serviceman check and adjust the operation handle.

The engine can not reach idle speed.

(1) The operation handle does not reach the idle speed position.

(2) Slight seizure of the rack and ring gear.

(3) The low-speed settings is not proper.

Correction:

Let professional serviceman repair it, or replace the fuel injection pump.

Let professional serviceman adjust it.

The governor does not work and speed exceeds 110% of the rated speed (usually called flying away)

(1) speed is too high.

(2) Deadlock of control rack or throttle lever.

(3) Dropout of the pin connecting the rack and drag link.

(4) Dropout of the throttle lever screw.

(5) Break of speed governing spring.

Correction:

Make emergency stop at once by cutting off fuel supply or air supply. Let professional serviceman check and repair it. Or replace the fuel injection pump if necessary.

Let professional serviceman repair it, or replace the fuel injection pump.

Starlight Power provides 20kw to 2500kw diesel generator set with various brand, including Cummins, Perkins, Volvo, Deutz, Ricardo, Yuchai, SDEC, Weichai, etc. Contact us: sales@dieselgeneratortech.com.