Changing The Fuel Filter, Jw6H - Grundfos Fire NKF Montage- Und Betriebsanleitung

5. Start the engine by pressing button S1 on the control panel
and check for leaks. Then press button S3 to switch the
engine off again.
Fig. 33 Diesel injection pump JU4H and JU6H

9.5.2 Changing the fuel filter, JW6H

D C E F
Fig. 34 Fuel filter, JW6H
The engine JW6H has two fuel filters - the round primary filter
with a water collector (fig. 34, pos. 8.1) and the rectangular
secondary filter (fig. 34, pos. 8.2).
Changing the primary filter
1. Close the fuel tap (fig. 7, pos. 7).
2. Open the drain screw of the water deposit (fig. 34, pos. A) and
collect fuel in a suitable container. Dispose of the fuel in an
environmentally sound way.
3. Turn the retaining ring of the filter housing (fig. 34, pos. B)
anti-clockwise by a quarter of a turn and remove it. Push the
holding ring up whilst turning to overcome the turning block.
Then remove the fuel filter pulling downwards.
4. Check the filter holder for dirt, and clean if necessary.
5. Remove the water deposit from the old filter element.
Empty the container and clean it. Dispose of the fuel in an
environmentally sound way.
6. Install the water deposit on the new filter element and tighten.
7. Insert a new fuel filter into the filter holder. Ensure that the
blocking mechanism fits exactly into the grooves on the filter
holder. If necessary, move the filter element gently from side-
to-side to ensure a correct positioning.
8. Screw the retaining ring back onto the filter holder, making
sure that the dust seal fits properly in the holder. Tighten the
retaining ring by hand until you hear and feel it click into place
(approx. 1/3 of a turn). Do not over-tighten the retaining ring!
9. Open the fuel tap (fig. 7, pos. 7) and vent the fuel system.
See next section.
A
8.2
B
8.1
A
Changing the secondary filter
1. Close the fuel tap (fig. 7, pos. 7).
2. Unscrew the ventilation port (fig. 34, pos. C) on the side of the
filter holder and remove the plug (fig. 34, pos. D) to drain the
fuel from the filter. Collect the fuel in a suitable container and
dispose of according to regulations.
3. Press the fuel filter (fig. 34, pos. 8.2) against the holder and
remove the upper and lower retaining clips. Then remove the
fuel filter from the guide rods of the filter holder.
4. Push the new filter onto the guide rods and press it firmly
against the holder. Then secure the retaining clips, first the
bottom one and then the upper one.
5. Screw in a new drain plug. Tighten the ventilation port and
drain plug. Do not over-tighten!
6. Open the fuel tap (fig. 7, pos. 7) and vent the fuel system.
See next section.
Venting the fuel system
Warning
Fuel expelled under pressure can penetrate the
skin and cause serious injuries. The pressure
must therefore always be released before the fuel
pipes are disconnected. Only re-pressurize once
all the pipes have been secured.
First vent the fuel system at the primary filter:
1. Loosen the ventilation port (fig. 34, pos. E) at the fuel filter
receptacle.
2. Operate the manual venting system (fig. 34, pos. F) at the fuel
filter receptacle until the emergent diesel fuel does not contain
air bubbles. Collect the fuel in a suitable container and
dispose of it in an environmentally sound way.
3. Carefully re-tighten the ventilation port. Keep the manual
venting system pressed downwards.
Then vent the fuel system at the secondary filter:
1. Loosen the ventilation port (fig. 34, pos. C) at the fuel filter
receptacle.
2. Operate the manual venting system (fig. 35, pos. A) at the fuel
supply pump until the emergent diesel fuel does not contain air
bubbles. Collect the fuel in a suitable container and dispose of
it in an environmentally sound way.
3. Carefully re-tighten the ventilation port. Keep the manual
venting system pressed downwards.
4. Start the engine by pressing button S1 on the control panel
and check for leaks. Then press button S3 to switch the
engine off again.
Fig. 35 Diesel injection pump JW6H
If the engine does not start, the fuel system may also need to be
vented at the fuel injection pump. The procedure is as follows:
1. Loosen the connector (fig. 35, pos. B) of the fuel pipe at the
first injection nozzle.
2. Crank up the engine with the starter until fuel without air
bubbles emerges from the connector. Collect the fuel in a
suitable container and dispose of it in an environmentally
sound way.
B
A
21