If blow-off valves are mounted the re-
attachment depends on the variant of
dismounting:
• Variant 1: screw in and tighten the two valve
fixing screws (2).
• Variant 2: screw in and tighten the three
fixing screws of the head bottom cover (3).
For the corrective maintenance, probably both
variants may be used.
Turn the valve support to its correct position.
Screw in and tighten the two fixing screws (1).