Webasto Diesel Cooker x100 Service Manual - page 33
Webasto Diese Cooker X 100
7 Maintenance and service
701
- You can begin to take verifying measurements only
after the device has heated up thoroughly, i.e.
approximately 10 min after ignition.
- The battery voltage must be at 12 -14 V while
taking measurements. A battery or stabilized direct-
current supply should be used for supplying power. A
battery charger or rectifier can not be used because
the device will not function properly with them.
A Fuel input measurement
1.
Turn on the device.
2.
Adjust the device to maximum.
3.
Figure out how much fuel is being consumed
by measuring the fuel consumed during a
period of 6 min. using a 50 or 100 ml
measuring cylinder. When multiplying the
result by 10 you’ll get the value ml/h.
If the fuel input differes from the nominal value (see
technical information), adjust the input according
adjustment instructions.
- A dish should be set on the left-hand burner when
the stove has been on at full power for a period of 15
minutes. Otherwise, the stove will over-heat and
obtaining normal measurements will be impossible.
B Fuel input adjustment
1.
Turn on the device.
2.
Adjust the device to maximum.
3.
About 5 minutes after start-up, measure the
pump’s input at maximum and adjust it to the
correct value using the “PUMP” trim, which is on
the card; the adjustment range is approximately
± 5 %
a. Turning the trim counter-clockwise will
decrease the yield, turning the trim clockwise
will increase it.
b. Measure the fuel input again.
C Malfunction of the pump
Malfunctions in the pump may be caused by dirt build-
up in the valves or a damaged valve disc. Even a small
particle may prohibit the pressure gradient, needed for
pumping, from forming, especially when starting the
device for the first time, when the pump does not
contain fuel. In this case, you can decrease the
pumping pressure gradient by putting the suction end
of the fuel hose in a bottle containing fuel, for example.
Then, raise the bottle to the same level of the heater or
above it.
Change the pump if needed.
Consider the following before taking measure-
ments:
Maintenance procedure:
1. Clean the burner
Open the burner according the instructions in 3.4.
Change the bottom mat if needed.
2. Check the glow plug
See malfunction and testing of the glow plug in 3.2.
Change the glow plug if needed.
3. Measure the fuel consumption
The fuel pump functions with electric pulses created
by an electronic pulse generator. You can hear the
pump running by the soft “thumping” sound it makes.
The more rapid the pulses (shorter pulses) are, the
more fuel the pump
delivers
. The ratio between the
pulse interval and the amount of fuel is constant. The
pump is adjusted to fixed volume at the factory,
therefore all pumps
provide
the same amount of fuel
within the same pulse interval.
Later, as the pump gets older, it may raise the
amount of fuel input by 5 - 10 %. Therefore, you
should always make a verifying measurement of the
fuel input when servicing the device or changing the
pump.
7.1 Basic maintenance
The cooker shall be serviced every two years by an
authorized service cent
er
.
In case of intensive use, replace the fuel filter once a
year.
The suction height (from the top of
the measuring glass to the bottom
of the device) must be 30 - 60 cm
or, more accurately, the same
suction height as in the actual
installation.
7 Maintenance and service