Repair information and repair instructions 19
6.2.5 Replacing the non-return valve in the distributor block
Tools required:
• Crosstip screwdriver, size 1,
• Open-ended spanner SW 22,
• Brass brush,
• Thread tapper M 10 x 1 for internal thread,
• Special locknut tool G 3/8, special spanner SW 20 with handle bar from Set WM 15348.
1. Unscrew the base section of the housing (see
steps 11. to 13. in chapter ”6.2.3 Dismantling
the housing“ on page 14).
2. Screw the special locknut tool onto the oxygen
inlet 5.
3. Clamp the special locknut tool in a vice.
4. Tighten the nuts of the special locknut tool
against the pressure connection using an
open-ended spanner (SW 22).
5. Place the special spanner (SW 20) onto the
distributor block.
6. Next, screw the special spanner with the hous-
ing in an counter-clockwise direction until the
oxygen inlet 5 has been loosened.
7. Open the vice, and unscrew the special lock-
nut tool with the oxygen inlet 5 in a counter-
clockwise direction.
8. You can now remove the non-return valve 48.
9. Remove any adhesive residue from the thread
surfaces:
– Clean the outer thread with a brass brush.
– If necessary, re-cut the inner thread (fine
thread M 10 x 1).
10. After removing cap 47, use oxygen to blow
out any residues etc. from the distributor block.
11. Insert the new non-return valve 48.
Ensure the correct installation position: The seal-
ing surface of the non-return valve must be point-
ing towards the oxygen inlet 5!
12. Wet the cleaned thread of the oxygen inlet 5
with Loctite 245 and screw it tight using the
special locknut tool.
13. Clamp the special locknut tool in a vice.
14. Loosen the nuts of the special locknut tool using
an open-ended spanner (SW 22).
15. Remove the Module from the vice and unscrew
the special locknut tool.
16. Join the two halves of the housing together
(see “6.2.4 Assembling the housing” on
page 16).
17. Fit cap 47 (see „6.2.2 Replacing the O-ring in
the oxygen outlet“ on page 14).
18. Perform a final check (see “3. Final Check” on
page 7).
Special spanner
SW 20
5
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