Technical data
9.The repair DBW 2010 / 2012 / 2020 / 2022 / 300 / 350
918
9.2.15 The replacement of the fuel pump
9.2.15.1 Dismounting
1. Open the burner head to the side (refer to 8.5.1).
2. Remove the ignition electrodes (refer to 9.1.14.1).
3. Remove the hollow bolts (22, Figure 905) and
washers (21) and take off and remove the fuel lines
(20).
4. Remove the screwed connections at the pressure line
(16) and take off the pressure line.
5. Remove the bolts (23) and take off the plain butt gear
(25).
6. Remove the segment (26) and take off the nozzle
block plate (24).
7. Take off the bolts (17) and washers (18) and remove
the fuel pump (19).
8. Apply the measures pertaining to the elements in
dismounted status (refer to 9.1.1).
9.2.15.2 Mounting
1. Get the fuel pump (19, Figure 905) in the assembly
position and fixate it with the bolts (17) and washers
(18).
2. Tighten the bolts with 3.0 Nm.
3. Install the plain butt gear (25) and secure it with the
segments (26).
4. Install the nozzle block plate 824) and fixate it with
bolts (23).
5. Tighten the bolts with 5.5 Nm.
6. Bring the pressure line (16) in the assembly position
and tighten the screwed connections with 6 ± 0.6 Nm.
7. Bring the fuel lines (20) in the assembly position and
fixate with the hollow bolts (22) and washers (21).
8. Tighten the bolts with 15 ± 1.5 Nm.
9. Install the ignition electrodes (refer to 9.2.14.2).
10. Turn the burner head toward inside (refer to 8.5.1).
9.2.16 The replacement of the magnetic valve
9.2.16.1 Dismounting
1. Open the burner head to the side 8refer to 8.5.1).
2. Remove the ignition electrodes (refer to 9.2.14.1).
3. Remove the pre-heating of the nozzle block (refer to
9.2.11.1).
4. Remove the bolts (23, Figure 905) and take off the
nozzle block plate (24).
5. Remove the electrical connections of the magnetic
valve.
6. Remove the nut (1, Figure 907), remove and take off
the magnetic valve head (3) and washer (2).
7. Remove the magnetic valve block (4) if necessary
and take off the gasket (5), pin (6), spring (7) and
stud (8).
8. Apply the measures pertaining to the elements in
dismantled status.
9.2.16.2 Mounting
1. Install the gasket (5, Figure 907) on the magnetic
valve block (4).
2. Place the spring (7) and pin (6) on the stud (8).
3. Place the stud together with the spring and pin in the
magnetic nozzle block (4).
4. Screw the magnetic valve block (4) in the nozzle
block (9).
5. Tighten the bolt with 11.5 Nm.
6. Place the magnetic valve head (3) on the magnetic
valve block and fixate it with washer (2) and nut (1).
7. Tighten the nut with 2 Nm.
8. Fixate the nozzle block plate (24, Figure 905) with
bolts (23).
9. Tighten the bolts with 5.5 Nm.
10. Install the pre-heating of the nozzle block (refer to
9.2.9.2).
11. Install the ignition electrodes (refer to 9.2.12.2).
12. Install the electrical connections of the magnetic
valve.
13. Turn the burner head toward inside (refer to 8.5.1).
9.2.17 The replacement of the combustion
chamber
9.2.17.1 Dismounting
1. Open the burner head to the side (refer to 8.5.1).
2. Take off the combustion chamber (1, Figure 908)
from the heat exchanger (2).
3. Apply the measures pertaining to the elements in
dismantled status (refer to 9.1.1).
9.2.17.2 Mounting
1. Install and push the combustion chamber (1, Figure
908) on the heat exchanger (2) all the way to the end.
2. Turn the burner head toward inside (refer to 8.5.1).
9.2.18 The pre-heating thermostat of the nozzle
block
9.2.18.1 Dismounting
1. Open the burner to the side (refer to 8.5.1).
2. Dismount the electrical connection.
3. Remove the thermostat (4, Figure 906) from the
nozzle block plate (7) or the disc (1) and remove the
bolt (5), catch (6) or the nut (3) and knurled washer
(2).
4. Apply the measures pertaining to the elements in
dismounted status (refer to 9.1.1).
9.2.18.2 Mounting
1. Bring the thermostat (4, Figure 906) in the assembly
position and fixate it with catch (6) and bolt (5) to the
nozzle block plate (7) or to the disc (1) with the bolt
(3) and knurled washer (2)
2. Install the electrical connection.
3. Turn the burner toward inside (refer to 8.5.1).