13 54 010 Performing throttle valve basic setting (S65)

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 (S65) .

Fig 1: Identifying Idle Speed Stop Screw And Caps

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Checking throttle valve basic setting: 

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 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.

Fig 2: Checking Gap Between Stop Screw And Actuator Of Throttle Valve Using Feeler Gauge

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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: Identifying Actuating Shaft, Actuating Lever And Screw Connections

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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 5-8.

Fig 4: 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 5: Identifying Throttle Valve Assembly

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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 mechanism; such torque would impair the quality of adjustment.

• After pretightening actuating lever, actuate throttle valve several times at full load.

Fig 6: Identifying Actuating Lever

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Adjusting throttle valve assemblies 1 - 4 and 5 - 8: 

The previously described procedure applies to adjusting/setting throttle valve assemblies 1 - 4 and 5 - 8.

Adjust throttle valve assemblies 1 - 4 and 5 - 8 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 VALVE ACTUATION (S65) .

Fig 7: Throttle Valve Assembly Screws Tightening/Loosening Sequence

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