Underbody restructuring

PARTS REQUIRING SETUP ON THE BENCH

1. 1
   Engine mount
2. 2
   Front wheel arch
3. 3
   Front half-assembly
4. 4
   Front side member
5. 5
   Radiator crossmember bracket
6. 6
   Front subframe front mounting box
7. 7
   Front subframe rear mounting box
8. 8
   Rear side member

1. MAIN SETTING-UP REFERENCES

A - REAR FRONT SUBFRAME MOUNTING

This is the main front setting-up reference.

1 - Front mechanical unit in place

The gauge fits over the subframe mounting bolt.

Two cases may arise:

1. 1
   For rear restructuring, these two points alone are sufficient for aligning and supporting the front of the vehicle.
2. 2
   For a minor front impact without removing the front subframe.

If in doubt about deformation of one of the main reference points (A or B), it is nevertheless advisable to use two additional points located in an area not affected by the impact, in order to confirm the setting-up.

2 - Front mechanical unit removed

NOTE: On the left side the hole is round; on the right side it is a slot.

If the rear subframe bracket is replaced, this reference is temporarily replaced by point (G), located on the rear part of the front side member, with point (A) then used to position the replacement part.

CAUTION: This point helps ensure front suspension geometry. It aligns the front subframe with the body and has a direct influence on all front suspension angles.

B - REAR SUBFRAME FRONT MOUNTING

This is the main rear setting-up reference.

1 - Rear mechanical unit in place

The gauge fits over the rear suspension bearing bracket mounting bolts.

Used for a front impact or a minor rear impact.

2 - Rear mechanical unit removed

The gauge rests under the rear suspension mounting box and is centred in the tapped holes of the rear suspension bearing bracket.

When the complete rear side member is replaced, this reference is replaced by point (G) located at the rear of the front side member. Points (B) are then used to position the replacement part.

IMPORTANT:

These points help ensure rear suspension alignment with the body and have a direct influence on the vehicle's tracking angle.

2. REFERENCES FOR POSITIONING REPLACED PARTS

C - FRONT SUBFRAME FRONT MOUNTING

With only the front mechanical components removed, the gauge rests under the front subframe mounting box and is centred in the threaded subframe mounting hole.

Use it when replacing:

• a partial or complete front side member,
• of a half-assembly

WARNING:

This point helps ensure front suspension geometry. It has a direct influence on the vertical travel of the lower wishbone, and therefore on variations in castor and toe.

F - FRONT SHOCK ABSORBER UPPER MOUNTING

The gauge rests under the shock absorber top mount and is located in the shock absorber top mount hole.

Use it when replacing:

• a wheel arch section,
• of a front half-assembly.

It is also used during straightening.

WARNING:

This point helps ensure front suspension geometry. It has a direct influence on the camber and caster angles.

P - ENGINE MOUNTING

The gauge is placed over the engine mount and is centred in the mounting holes of the pad.

Use it with the mechanical unit removed when replacing:

• a front half-assembly,
• a front wheel arch.

H - FRONT SIDE MEMBER END

The gauge rests under the side member and is centred in the tapped hole of the radiator crossmember mounting.

Use it with the mechanical unit removed when replacing:

• a side member,
• a front half-assembly,
• a radiator crossmember bracket.

K - FRONT IMPACT CROSSMEMBER MOUNTINGS

The gauge rests vertically against the radiator crossmember bracket and is centred in the tapped holes of the front impact crossmember mountings.

During restructuring, points (K) are used for replacing:

• a radiator crossmember bracket,
• a partial or complete front side member,
• a front half-assembly.

They also serve as a reference for point (K3), the front wing upper support mounting.

J - REAR SIDE MEMBER END

The gauge bears against the underside of the side member and is centred in the pilot hole.

Use with the body structure in place to realign the side member.

It is also used with the body structure removed, under the same conditions, when replacing the side member.

E - REAR SHOCK ABSORBER MOUNTING

The gauge is centred and fixed on the shock absorber axis.

Use this when replacing the complete rear side member.

L - SILL PANEL CROSSMEMBER

The gauge bears vertically against the rear sill panel lining and is centred on the studs for the rear bumper crossmember.

They are used when replacing:

• a bumper crossmember mounting reinforcement,
• a partial or complete rear side member.