54 37... Align basic gauge

Special tools required:

IMPORTANT: Always install and remove the basic gauge with 2 helpers.
To prevent damaging the basic gauge, set the gauge down only in the transportation crate or on the vehicle side panel.
The basic gauge is a highly sensitive measuring instrument which reacts even to light impacts with distortion.
The basic gauge must be checked for dimensional accuracy on a master gauge after being subjected to impact or dropped.

The basic gauge specifies the basic setting on the X, Y and Z axis.

The basic gauge is essential for the following job items:

Calibrating the coupling lock
Calibrating the roof module console

Lift out cover (1) on left base plate.

Installation note:

Cover (1) for base plate must be replaced after each removal.

IMPORTANT: The outermost left bore hole in the base plate is the reference point for the following operations.

Fig 1: Identifying Cover On Left Base Plate

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Special tool 54 0 120 must be equipped with correct plastic block (1).

Plastic block without labelling only matches E93.

Plastic block with labelling 2 360 046 B only matches F33/F83.

Remount plastic block (1) as necessary.

Fig 2: Remounting Plastic Block

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Basic gauge

NOTE: To attach the gauge use only special tool 00 9 251 .

Fig 3: Attaching Gauge Using Special Tool 00 9 251

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Remove butyl strip in side panel in area of basic gauge and clean with Isohexane.

Sand off protruding solder seams.

Restore corrosion protection.

Carefully mount special tool 54 0 121 (cross member) on side panel.

Connect special tool 54 0 122 (arm for x-axis spacing) to cross member and left cowl panel base plate.

IMPORTANT: Insert guide pin of arm 54 0 122 into extreme left hole of base plates.

Connect special tool 54 0 123 (arm, right) to cross member and gauge 54 0 122 .

Observe tightening sequence:

Tighten rear screws on basic gauge to 2 Nm.
Tighten screw connecting arms to 2 Nm.

Check basic gauge is contacting at all four contact points.

NOTE: Owing to the body tolerances, there may be a gap on one side between the arm and body.

Do not exert any pressure on the arms!

Fig 4: Ensuring Basic Gauge Contacts All Four Contact Points

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IMPORTANT: Adjustment work should be carried out by one person only.

Adjust knurled screws without exerting force.

Center basic gauge to body with knurled screw.

Fig 5: Centering Basic Gauge To Body

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Set identical value on scale on both sides (this value may differ from vehicle to vehicle because of the body tolerances). Signs (+ or -) must be identical on both sides.

Basic gauge must contact on inner side panel with no play.