Mitsubishi 4DQ50 Service Manual page 39

Fig. 3-26 Diaphragm block of governor
Fig. 3-27 Venturi unit
4-7 Governor (mechanica/)
1) Model 4DQ50 Engine is equipped, for governing of its speed, with mechanical
governor (centrifugal type) which connected directly with fuel injection pump
camshaft.
This governor is RUV and all-speed type, so it controls not only max-min
engine speed but also can control every engine speed by control lever position.
2) As mechanism illustrated Fig. 3-28, two flyweight combined with governor
shaft and rotates through the gear which equipped with camshaft, and
centrifugal force of weight conducts to the governor sleeve.
In the governor sleeve, angleich spring is equipped. Centrifugal force of
flyweight and control spring force act to this spring, so it works as angleich.
Control spring is installed to the adjusting lever's shaft and one end of spring
put to the spring seat. Control spring force changes by this lever's motion.
The lower parts of floating lever is ·combined to supporting lever and this
position is determined by
full~load
stopper.
Sliding peace, which is equipped in the middle of the floating lever, inserts
governor sleeve groove and works with movement of sleeve, and move the
control rack which connected with upper parts of the floating lever.
The arm, which connects floating lever and control rack, is equipped with start
spring and one end of spring is connected with governor housing.
This spring always pull the control rack to the fuel feed "increase" and increase
of fuel feed at starting. In the case of torque spring equipped, torque control
lever is installed, and upper parts of lever touch to the torque spring adapter,
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