gas type VOLKSWAGEN CARAVELLE 1992 T4 / 4.G Owners Manual

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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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