Accelerator - Adjusting Control

TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE: December 1994

REF.NO. 30/13

SUBJECT:
ENGINE 111 ADJUSTING ACCELERATOR CONTROL

As of July 1994, the accelerator control (at the engine) was modified in engine 111, therefore the accelerator control adjustments were modified.

In the event that any engine related accelerator control parts are replaced, only the modified parts are available and must be installed.

Effective Serial Number:

Effective Serial Number

WARNING!
Before returning car to owner verify proper throttle opening/closing.

MODIFICATIONS:

Fig. 1 - Up To June 1994:

Up to June 1994

Fig. 2 - As Of July 1994:

As of July 1994

^ Decreased accelerator pedal force.
^ Improved pedal reel due to a modified accelerator fulcrum lever (32/6, Figure 2).
^ Modified cruise control linkage (arrow).
^ Change in the location of the throttle return spring (32/20 and 32/21).
^ Improved return travel of accelerator control components.

ADJUSTING THE ACCELERATOR CONTROL:

Previous adjustment procedures for accelerator control are still valid except for the connecting rod (32/4, Figure 3 [refer to SMS, Engine 111, Combustion, Job No. 30-1010]).

ADJUSTING THE CONNECTING ROD
(32/4, FIGURE 3), UP TO JUNE 1994:

Fig. 3:

1. Disconnect one end of the connecting rod (32/4, Figure 3).
2. Angle lever must be resting against idle stop of idle speed control (ISC) actuator (M16/6).
3. Rest connecting rod (32/4, Figure 3) against ball head (1) without tension. Shorten connecting rod (32/4) length by turning ball socket (2) 2 complete clockwise revolutions. Reconnect ball socket to ball head and tighten nut.

Note!
The adjustment of the connecting rod (32/4, Figure 3) is critical because the closed throttle position (CTP) switch (M16/6s1) for the ISC actuator (M16/6) must be closed (actuated) at idle.

ADJUSTING THE CONNECTING ROD
(32/4, FIGURE 3), AS OF JULY 1994:

Fig. 4:

1. Disconnect connecting rod (32/4, Figure 4) from the throttle plate angle lever (32/5).
2. Angle lever (32/5, Figure 4) must be resting against idle stop of the ISC actuator (M16/6).
3. Adjust connecting rod (32/4, Figure 4) so that when connected the inner top of the ball socket slightly contacts the ball head. Therefore, the connecting rod (32/4) along with the accelerator control are lifted slightly when attached.

Note!
The adjustment of the connecting rod (32/4) is critical because the CTP (M16s1) switch for the ISC must be closed at idle.

This adjustment must be precise so that if the ISC actuator (M16/6) vibrates due changes in engine torque the CTP switch does not open prematurely.