It is mandatory if a car that has been in an accident is being repaired. A deformed beam can cause overloads and rear axle noise. The beam is checked both in the horizontal and vertical planes in the following order.
Attach a square flange A.70172 to each end of the beam (the side of the square is 150 mm and polished) and install the beam with flanges on identical prisms so that the contact surface of the crankcase to the beam is in a vertical plane. Beam deformation 1 (pic. 81) check by attaching a square 3 to the outer and side surfaces of the flange A.70172 (2). If the beam is not deformed, the square will fit snugly. The amount of deformation is checked with a feeler gauge. If the 0.2 mm feeler gauge passes through any flange, the beam must be straightened. The perpendicularity of the mounting surface of the gearbox relative to the bearing surface of the flange A.70172 is checked using a square. The 0.2 mm probe must not pass through. If the deformation exceeds the specified one, the beam must be corrected.
After completing all the edits, the beam is thoroughly washed and the quality of the welds, the tightness of the beam, and the cleanliness inside the beam are checked (free of burrs, chips and oil residues) and the cleanliness of the breather. The beam is then painted on the outside to prevent corrosion.