Mercedes-Benz 603 Service Manual page 314

Remove partition wall " A" (9 bolts), of which
6 (WAFlO) are accessible from above, 2 (WAF8)
and 1 (WAFIO) accessible from below.
5 Detach vacuum lines red/violet/brown on
EGR valve and red/violet/blue on air recirculation
valve.
6 Loosen clips " B" on corrugated pipe, and
remove corrugated pipe.
Unbolt trap oxidizer from exhaust manifold,
remove trap oxidizer and supporting bracket at
the same time.
8 Remove charge air connecting line (138 a).
EXIT