Function of the injection system: - ra07106020010x(0010)

J. RSF governor Engine 602. 96, 603.96/97 TURBO (Model 463.3: pay attention to variations) 

J. RSF Governor 

1. a) Design and operating principle 

   The governor is a minimum/maximum speed governor, the governor spring of which (2m) is sized and set in such way that it does not govern in the part load range, with the exception of torque control (refer to "Control when starting and at full load"). In the part load and full load range, the control rod (2t) of the injection pump is operated only from the accelerator pedal, which is connected through the accelerator control linkage to the control lever (2g) of the governor.

   The idling spring (2n) is pretensioned and the idle speed set by the adjusting screw (3).

   Fig 1: Identifying RSF Governor Components

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
   Fig 2: Identifying RSF Governor Components

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
2. Control when idling 

   Control lever (2g) is resting against the idle stop screw (2b). As the engine speed increases, the sliding sleeve (2h) passes through the idling state. Guide lever (2a) swivels around the pivot point "A" and thus operates against the idling spring (2n).

   At a certain engine speed, the guide lever (2a) moves against the adjusting nut of the idling auxiliary spring (2o). The movement of the sliding sleeve (2h) is transmitted through the relay lever (2c) and fulcrum (2d) in the same direction to the control rod of the injection pump. After passing through the idling stage, the sliding sleeve (2h) moves against the spring retainer (2e). If the engine speed increases further (e.g. deceleration), from a certain engine speed on, first of all the spring retainer (2e) and then the governor spring (2m) is over-compressed. The control rod is thus brought into the "stop position" (deceleration fuel cutoff).

   Fig 3: RSF Governor operation Diagram - Control When Idling

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
3. Control with actuator 

   The lift rod (163) is resting against the guide lever (2a). The actuator (Y22) is fed by the control unit (electronic idle speed control) with a clocked D.C. voltage in the frequency range of approx. 50 Hz. If engine speed drops (e.g. drive position engaged or power steering turned to full lock), the actuator is energized with a higher voltage. This causes the lift rod (163) to press against the guide lever (2a) and the control rod (2t) moves in the direction "a" increased quantity.  As soon as the engine speed increases, the voltage is reduced and the control rod (2t) moves in the direction of "b" reduced quantity. 

   Fig 4: RSF Governor operation Diagram - Control With Actuator

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
4. Start position 

   If the control lever (2g) is moved against the full load stop (c) (fixed stop on governor housing) when the engine is not running, the relay lever (2c) moves around the pivot point "B" and moves the fulcrum lever (2d) with it in the direction of Start. When the control lever is in the full load position (2g "Full throttle") the idling auxiliary spring (2o idling stabilizer) is pressed away from the guide lever by the cutoff idling auxiliary spring (2j).

   This enables a more rapid cutoff from the start position of the governor.

   Fig 5: RSF Governor operation Diagram - Start Position

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
5. Full load speed regulation/adaption 

   After passing through the idling stage (c) (refer to ill. of control when idling) the governor sleeve (2h) moves against the spring retainer (2e). This causes the relay lever (2c) and fulcrum lever (2d) to move the control rod of the injection pump into the full load position.

   When a certain engine speed is reached, the spring retainer (2e) is over-compressed by a certain distance (d) (adaption).

   If the engine speed continues to rise, the force of the flyweights is sufficient to overcompress the governor spring (2m) (full load speed regulation). The start of cutoff depends on the preload of the governor spring (2m).

   Fig 6: RSF Governor operation Diagram - Full Load Speed Regulation Adaption

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
6. Engine stop 

   The vacuum unit (6) is pressurized with vacuum from the vacuum pump through the glow start switch of the vehicle. This causes the diaphragm of the vacuum unit to move against the compression spring.

   The vacuum unit (6) is connected to a stop lever (2r), which swivels about the pivot point "D", pulling the control rod of the injection pump into "Stop" position. This causes the deflecting spring of the fulcrum lever to be over-compressed. The control rod can be pulled into the "Stop" position from the outer side of the governor in the same way by means of the emergency stop lever (2s).

   Fig 7: RSF Governor operation Diagram - Engine Stop

   Courtesy of MERCEDES-BENZ OF NORTH AMERICA.