Aligning Basic Gauge

54 37 ... - Aligning basic gauge





Special tools required:
- 00 9 251 00 9 250 Torque Wrench with Flexible Extension
- 54 0 121 54 0 120 Basic Gauge, Retractable Hardtop
- 54 0 122 54 0 120 Basic Gauge, Retractable Hardtop
- 54 0 123 54 0 120 Basic Gauge, Retractable Hardtop






Important!
Always install and remove 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 wall.

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 stipulates the basic setting in the X-, Y- and Z-axes.

The basic gauge is absolutely essential for the following work operations:

- Gauging coupling fastener
- Gauging roof module bracket





Lift out cover (1) on left base plate.

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

Important!
The outer left hole in the base plate is the reference point for the following jobs.

Basic gauge:





Note:
Use only special tool 00 9 251 00 9 250 Torque Wrench with Flexible Extension to screw the gauge into position.

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

Grind off protruding soldered seams.

Re-establish corrosion protection.

Carefully position special tool 54 0 121 54 0 120 Basic Gauge, Retractable Hardtop (cross beam) on side panel.
Connect special tool 54 0 122 54 0 120 Basic Gauge, Retractable Hardtop (extension arm for X-axis clearance) to cross beam and left cowl panel base plate.

Important!
Insert guide pin of extension arm 54 0 122 54 0 120 Basic Gauge, Retractable Hardtop in extreme left hole of base plate.

Connect special tool 54 0 123 54 0 120 Basic Gauge, Retractable Hardtop (right extension arm) to cross beam and extension arm 54 0 122 54 0 120 Basic Gauge, Retractable Hardtop.
Observe tightening sequence:

1. Tighten down rear screws on basic gauge to 2 Nm.
2. Tighten down screw to connect extension arms to 2 Nm.





Check basic gauge for contact at all four contact points.

Note:
On account of the body tolerances there may be on one side a gap dimension between extension arm and body.

Do not exert any pressure on the extension arms.





Important!
Adjustment work should be carried out by one person only.

Adjust knurled screws without exerting force.
Centre basic gauge with knurled screw to body.

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 rest without play on inner side panel.