Exhaust System (V12)
6.2.1 GENERAL DESCRIPTION
6
4 5
J30-234
Fig. 1 Plan View of Exhaust system
'he low
-loss catalytic converter exhaust system for the VI2 engine comprises catalyst/downpipe assembly with addi- tional secondary catalytic converters (1 Fig.11, a underfloor catalytic converter assembly (2 Fig.1) complete with heat
shield (3 Fig.l), an intermediate muffler section (4 Fig.1) and a rear muffler section (5 Fig. 1).
On non-catalytic converter systems, the downpipe/catalyst assembly is fitted with conventional twin branch down- pipes (6 Fig.11, hence there are no oxygen sensors or exhaust gas temperature sensors.
Conventional mufflers are fitted in place of the underfloor converters.
X300 VSM 1 Issue 1 August 1994
b Exhaust System (V12)
8
Fig.
P
Components of the Exhaust System
130 -2 33
Two heated oxygen sensors are fitted to the downpipe assembly (1 Fig.1) which is connected to the manifold and two
on the underfloor catalytic converter assembly in front of the catalysts. There are two sensorsfor the ROW and Japan
markets (2 Fig.1) and two additional sensors (3 Fig.1) for the NAS markets.
The sensors are located on A
-bank and B-bank, upstream and downstream of catalytic converters.
Apart from two heated oxygen sensors, the exhaust system for vehicles destined for the Japanese market are also
fitted with two gas temperature sensors
(4 Fig.1).
The exhaust system is held in a predetermined position by a fixing arrangement to the manifold by exhaust centre
mountings (5 Fig.l), by rear axis mountings (6 Fig.1). and tail pipe mountings (7 Fig.1).
Clamps (8 Fig.1) used on each slip joint are welded to the pipes and tightened to a higher torque setting than non- welded clamps. ~ ~~~
Issue 1 August 1994 2 X300 VSM
