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TECHNICAL
DESCRIPTION
Attention
Due to high temperatures which
can occur in the catalytic
con
verter in very unfavourable conditions, the vehicle should not be parked so that the catalyt
ic converter can come into
con
tact with inflammable materials.
If whilst driving, the engine mis
fires, loses power and runs uneven ly,
this
could be due to a fault in the ignition system. In a
case
like this,
unburnt fuel can enter the exhaust
system and then escape to atmos
phere.
Furthermore, the catalytic
converter could become damaged
due to overheating. The vehicle
speed must be reduced immediately
and the defect should be eliminated
at the nearest Volkswagen dealer.
Note
Even
in the
case
of a
perfectly working
ex
haust emission control system there can, under certain engine operating conditions,
be
a
sulphur-type exhaust
smell.
This
depends upon
the
sulphur content
in
the fuel being
used.
Quite often this can
be
remedied
by
select
ing another brand
of
fuel
or,
filling
up
with
unleaded premium petrol.
50
kW
Diesel
engine
An
oxidation catalytic converter
is
fitted
in
the exhaust system
of
this Diesel engine.
It
consists
of
a steel-cased ceramic body
con
taining
a
multitude
of
longitudinal
passages
which are vapour coated
with
platinum. The catalytic converter largely eliminates
the
unpleasant smelling hydrocarbons
and
turns carbon monoxide
into
carbon dioxide.
In addition
an
exhaust
gas
turbocharger
forces
air
into
the
cylinder, causing
the
en
gine
to
operate
with
a high
excess
of
air. The
fuel which is then injected in is so complete ly
burnt,
that
under
full
load soot is no longer
visible
in the
exhaust.
As
the
diesel engine catalytic converter
does
not get
hotter than
a
conventional
ex
haust system, under normal conditions
there
is
nothing special
to be
noted, this
applies
also
to
parking.
The system does
not
require any additional
care
or
maintenance.
Activated
charcoal
filter*
Vehicles
with
a
regulated catalytic
con
verter,
in
Germany
and
other export countries, have
a
fuel system which
in
cludes
an activated charcoal
filter
(petrol vapour accumulator).
The activated charcoal
filter
prevents
the
fuel vapour escaping
into
the
atmosphere.
These
vapours
pass
into
a
container filled
with
activated charcoal and, when
the en
gine
is
stationary they
are
accumulated
in
the activated charcoal. When
the
engine
is
running,
the
container
is
automatically
ventilated
by
opening
a
valve
and the
fuel
vapour
is fed
into
the
engine
for
combus
tion.
The system works completely automati
cally
and
is
maintenance-free.
138
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