18
6 Components
6.1.5 Glow Plug (Not Applicable to Air Top!)
Description:
The filament of the glow plug serves to ig-
nite the fuel/air mixture upon start-up of the heater.
Glow plug series resistors can
be
used
to
reduce the
temperature at the filament (see section 6.4).
Removal:
- Remove cap (wiring harness)
(using Phillips screwdriver)
- Remove seal from plug pins
- Unscrew glow plug (socket wrench size 19).
Check: Current draw
12
V
24
V
Test voltage
12
± 0,2 V
24
± 0,2 V
: Current draw
• max.
22
amps
max.
15
amps
Any coked residues on the glow plug should
be
removed
by
glowing and careful cleaning. Replace
glow plug, if necessary.
Note: A coked glow plug may be
an
indication of irregu-
lar combustion.
In
this case, the CO2-setting and com-
bustion values (see section 6.1.3) must be checked.
Installation: Installation is the reverse of removal.
When screwing
in
the glow plugs a torque of
28
Nm
is
to
be used. Coat threads using Copaslip.
A new seal must be installed under the cap (wiring har-
ness) prior
to
each installation. When attaching the cap
(wiring harness), it must
be
tightened to a torque of 1.0
Nm.
Order
no,
479 594 12V
I
Max.
Amperage
Tightening
Length of sleeve
1 voltage
torque
(i)
12
20
28Nm
ea.
7
mm
24
13,3
I
28Nm
ea.
3
mm
I
6.1.6 Pencil-Tape Glow Plug (Unique to Air Top)
Description:
The pencil-type glow plug serves to ignite
the fuel/air mixture upon start-up of the heater.
Removal:
- Remove cap (wiring harness)
(using Phillips screwdriver)
- Remove screw (using Phillips screwdriver) and pull
out pencil-type glow plug
Check: When testing the pencil-type glow plug with a
digital multimeter, the following values should be ob-
tained:
Pencil-type glow
plug
i 12 volts (
red)
I
24
volts
(green)
Resistance at
24°C: 0.29
...
0.34 ohms
1.2
...
1.4
ohms
Test current
!
<5mA
<5mA
Installation: Installation is the reverse
of
removal. A new
seal must
be
installed under the cap (wiring harness)
prior to each installation. When attaching the cap (wiring
harness),
it
must
be
tightened
to
a torque of 1.0 Nm.
glow plug
pencil-type glow plug
CAUTION:
The glow plug or pencil-type glow plug is to be handled
with great care and to be removed from its packing
only just before installation.
Dia.
of
wire Filament length
I
Overall length
(2)
(3)
@
1,1
mm
ea.
20
mm
!
64,5± 1
mm
0,8mm
ea.
30
mm
I
64±
1
mm
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