13 54 010 Adjusting Basic Throttle Setting (S54)

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Interrogate fault memory of DME control unit. Switch off ignition.

Remove intake air manifold. Refer to 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (S54) .

CAUTION: Idle stops of throttle assemblies must not be altered! They have been set at the factory and secured against turning with locking paint. Plastic caps (1) on stop screws must not be removed!

Fig 1: Identifying Plastic Caps On Stop Screws

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Checking Basic Throttle Setting:

To ensure that the basic throttle setting at the 6th throttle assembly can be properly checked, you must remove protective cap (1).

Release nuts.

Remove protective cap (1) of throttle.

Fig 2: Removing Protective Cap Of Throttle

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Remove idle-speed control valve (1) to facilitate access to throttle assembly 2.

Release nuts, remove idle-speed control valve (1) together with holder from assembly and place to one side.

Fig 3: View Of Idle-Speed Control Valve

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Gap between stop screw (1) and actuating lever (2) must be less than 0.05 mm.

To check gap, use a feeler gauge with a thickness of 0.05 mm.

Checking gap:

Pull rod of throttle actuator in opening direction of throttles.
Slide feeler gauge (3) between stop screw (1) and actuating lever (2).
Return throttles slowly to stops.

Fig 4: Sliding Feeler Gauge Between Stop Screw And Actuating Lever

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Press lever (1) on throttle actuator in closing direction of throttles. In so doing, compress overload spring (2) in pull rod (3).

Release lever (1) again.

When correctly adjusted, feeler gauge will jam between stop screw (1) and actuating lever (2) and will not fall out.

Perform check on each throttle assembly.

Fig 5: Pressing Lever On Throttle Actuator

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Adjusting Basic Throttle Setting:

A readjustment must be made if the gap is larger than 0.05 mm at one or more throttle assemblies.

Remove auxiliary air line. Refer to 13 41 100 REMOVING AND INSTALLING/REPLACING SUPPLEMENTARY AIR LINE (S54) .

NOTE: In order to ensure correct throttle setting, you must slacken all the screw connections on the actuating levers with the actuating shaft except at throttle assembly 1. It is not necessary to adjust the throttle at throttle assembly 1 because the actuating lever (1) on throttle assembly 1 is connected via set screw (3) to the actuating shaft (2). Also do not slacken screw connection of actuating lever of long pull rod with actuating shaft.

Fig 6: Identifying Actuating Lever On Throttle Assembly

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To release screw connection of actuating lever with actuating shaft, only turn nut (2) and grip screw (1).

Slacken screw connections of actuating levers with actuating-j shaft on throttle assemblies 2, 3, 4, 5 and 6.

Fig 7: View Of Actuating Lever With Actuating Shaft

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Adjusting Throttle Assembly 2:

Move actuating lever (1) of second throttle assembly downwards until actuating lever (2) rests without play against stop screw (3).

CAUTION: Do not exert any pressure!

Fig 8: Moving Actuating Lever Of Second Throttle Assembly

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Tighten down screw connections of actuating levers with actuating shaft again. Observe the following instructions in so doing:

Use screws and nuts only once.
Only turn nut (2) and grip screw (1).
To screw down, use two open-end wrenches which are to be placed at right angles to actuating shaft if at all possible. In this way, no torque is exerted on the actuating lever; such torque would impair the quality of adjustment.
Retighten nut to tightening torque of 7 N.m.

Installation:

If necessary, carry out adjustment with a second person.

Fig 9: Locating Screw Connections Of Actuating Shaft

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Adjusting Throttle Assemblies 3,4, 5 And 6:

To adjust throttle assemblies 3, 4, 5 and 6, follow the same procedure as for adjusting throttle assembly 2. Carry out adjustment of throttle assemblies 3, 4, 5 and 6 in sequence.

Carry out checking of basic throttle setting.

If necessary, carry out adjustment of basic throttle setting again.

Adjusting Full-Load Stop:

Activate servomotor via DIS Tester or MoDiC until throttles are fully open and stop screw (1) rests on detent lug.

Follow instructions featured in DIS Tester or MoDiC.

Fig 10: Identifying Stop Screw

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Carry out measurement at throttle of first throttle assembly (cylinder 1).

Adjust measurement (A) = 24.66 mm +/- 0.2 mm by turning stop screw.

Activate servomotor several times and check whether measurement (A) is in tolerance range.

Fig 11: Adjust Measurement By Turning Stop Screw

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CAUTION: After working on throttle system (throttle assembly, servomotor, potentiometer), carry out electronic throttle test with DIS Tester or MoDiC without fail:

Service functions.
DME system checks.
Function test.

NOTE: Interrogate fault memory of DME control unit. Check stored fault messages. Rectify faults. Then clear fault memory.