MTU 12V4000G34F Operating Instructions Manual page 156

2. During engine operation, turn the switchover
level as far as the stop (arrowed) to cut out
the filter module to be serviced.
Result: • Filter module (1) is cut in
• Filter module (2) is cut out
3. Open threaded vent plug (1) of filter to be
serviced.
4. Open drain plug (1).
5. Allow water to drain until fuel emerges.
6. Close drain plug (2) again.
7. Drain the second filter on the module to be
serviced, from (→ Step 3).
8. Close threaded vent plug again.
9. Vent fuel prefilter (→ Page 167).
156 | Fuel Filter | MS15060/01E 2018-12