13 54 010 Performing Throttle Valve Basic Setting (S85)

Necessary preliminary tasks: 

• Read out fault memory of DME control unit.
• Switch off ignition.
• Remove intake air manifold. See 11 61 050 REMOVING AND INSTALLING AIR INTAKE MANIFOLD (S85) .

Fig 1: Identifying Idle Speed Stop Screw And Plastic Caps

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Checking throttle valve basic setting: 

To ensure that the throttle valve basic setting at the 10th throttle valve assembly can be properly checked, it is necessary to remove cover (2).

Unclip lines (1).

Release bolts and remove cover (2).

Tighten to specified torque, see 13 54 2AZ in 13 54 THROTTLE AND ACTUATOR .

Fig 2: Identifying Lines And Cover

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Gap between stop screw (1) and actuator (2) of throttle valve 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 valve actuator in opening direction of throttle valves.
• Slide feeler gauge (3) between stop screw (1) and actuator (2) of throttle valve.
• Return throttle valves slowly to stops.

When correctly adjusted, feeler gauge will jam between stop screw (1) and actuator (2) of throttle valve.

Perform check on each throttle valve assembly.

Performing throttle valve basic setting: 

A basic setting must be performed if the gap is larger than 0.05 mm at one or more throttle valve assemblies.

Fig 3: Checking Gap Between Stop Screw And Actuator

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It is not possible to set the throttle valve at throttle valve assemblies 5 and 6.

However, if increased play is ascertained, the corresponding cylinder bank must be reset.

The actuating levers of throttle valve assemblies 5 and 6 are connected to the actuating shaft via fitting screws and fitting bores.

Do not slacken the screw connections of the actuating levers for the long pull rods.

The long pull rods must not  be disengaged from the actuating levers for the setting procedure.

To slacken screw connection of actuating lever (1), grip screw (3) and release nut (2). (Replace nuts).

Release screw connections of actuating levers of throttle valve assemblies 1-4 and 7-10.

Fig 4: Identifying Screw Connections Of Actuating Levers Of Throttle Valve Assemblies

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Fig 5: Identifying Actuating Lever, Screw And Nut

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Adjusting a throttle valve assembly: 

Move actuating lever (1) in direction of arrow, i.e. "close throttle valve", until actuator (2) of throttle valve rests without play on stop screw (3).

Fig 6: Moving Actuating Lever

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Tighten down screw connection of actuating lever (1) again to actuating shaft. Observe the following instructions in so doing:

• Use nuts only once.
• When pretightening screw connection (approx. 5 Nm), hold actuating lever (1) of throttle valve in direction of arrow at "close throttle valve".
• Only turn nut and grip screw.
• To screw down, use two open-end wrenches which are to be placed at right angles to actuating shaft.
• In this way, no lever action is exerted on the throttle valve linkage; such torque would impair the quality of adjustment.
• After pretightening actuating lever, actuate throttle valve several times at full load.

Adjusting throttle valve assemblies 1-4 and 7-10: 

The previously described procedure applies to adjusting/setting throttle valve assemblies 1-4 and 7 -10.

Adjust throttle valve assemblies 1-4 and 7 -10 in sequence.

After successfully completing throttle valve basic setting and checking, tighten down all screw connections of throttle valve levers to specified torque, see 13 54 1AZ in 13 54 THROTTLE AND ACTUATOR .

Fig 7: Tightening Down Screw Connection Of Actuating Lever

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Fig 8: Identifying Screw Connections Of Actuating Levers Of Throttle Valve Assemblies

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