MTU 12 V 4000 M23F Operating Instructions Manual page 188

Replacing fuel filter with the en-
gine running
1. Cut out the filter to be replaced (1):
B Left filter cut out
C Right filter cut out
2. Remove the cut-out oil filter (1) using an oil
filter wrench.
3. Clean sealing surface on filter head.
4. Check sealing ring of new filter (1) and coat
with fuel.
5. Screw on filter (1) and tighten manually.
6. Turn three-way cock into position (A) where
both filters are operational.
7. Replace other fuel filters in the same way.
188 | Task Description | MS150068/01E 2014-01