Instructions For Processing Permanent Underbody Protection - Ah97.20-P-9409-01A

Model 124, 126, 129, 140, 163, 164, 166, 168, 169, 170, 171, 172, 197, 199, 201, 202, 203, 204, 207, 208, 209, 210, 211, 212, 215, 216, 218, 219, 220, 221, 230, 231.457/473, 240, 245.2, 251, 292, 414, 461, 463, 671, 690.6, 900, 901, 902, 903, 904, 905, 906, 907, 909, 910 

Model 415, 420, 447, 448, 470, 471, 636, 639 

Model 450, 451, 452, 453, 454 

The frame floor is coated with polyvinyl chloride permanent underfloor protection as standard, see "Paintwork and Corrosion Protection Information". This material is also used as a standard material for sealing work in areas such as spot welds and door folds.

When polyvinyl chloride materials burn, they release a highly corrosive hydrochloric acid.

The new permanent underfloor protection does not adhere well to the burned polyvinyl chloride, allowing corrosion to form later.

For this reason, always remove underfloor protection as well as polyvinyl chloride joint seals before starting any brazing or welding work.

This also applies for work such as cutting or grinding.

For the same reasons, it is preferable to separate damaged body parts using "cold" separating methods.