Webasto HL 90 Owner's Manual - page 37
HL 90
9 Repair
907
9.2.7 Heat Exchanger, Replacement
9.2.7.1 Removal
1. Remove control unit (refer to 9.2.1.1).
2. Remove glow plug (refer to 9.2.2.1).
3. Remove flame sensor (refer to 9.2.3.1).
4. Remove temperature limiter (refer to 9.2.4.1).
5. Remove drive (refer to 9.2.5.1).
6. Remove screws (3, Fig. 901) and lock washers (2)
from outer case (11) and remove from end cap (6).
7. Pull off end cap (6).
8. Carefully widen outer case and remove heat
exchanger.
9. Remove nuts (1, Fig. 903) and lock washers (2).
10. Pull rear wall (3) out of heat exchanger and remove
sealing cord (4).
11. Discard sealing cord.
12. Perform procedures on components after
disassembly (refer to 9.1.1).
9.2.7.2 Installation
1. Apply sealing and bonding compound
(Ident. No. 666 05A) to mating surfaces of sealing
cord (4, Fig. 903) and heat exchanger (5) and locate
with rear wall (3) in heat exchanger (5) for assembly.
2. Secure rear wall (3) with nuts (1) and lock washers (2).
3. Torque nuts (1) to 1.5 ± 0.2 Nm.
NOTE
When performing the following step ensure that all
connections and screw holes in outer case are centered.
4. Locate heat exchanger with outer case (11, Fig. 901)
and end cap (6) and assemble with screws (3) and
lock washers (2).
5. Torque screws (3) to 2.5 ± 0.2Nm.
6. Install drive (refer to 9.2.5.2).
7. Install temperature limiter (refer to 9.2.4.2).
8. Install flame sensor (refer to 9.2.3.2).
9. Install glow plug (refer to 9.2.2.2).
10. Install control unit (refer to 9.2.1.2).
Fig. 903 Replacement of Heat Exchanger
1 Nut (3)
2 Lock washer (3)
3 Rear wall
4 Sealing cord
5 Heat exchanger
1
2
3
4
5
Apply sealing and bonding compound
(Ident. No. 666 05A) to these surfaces.
!