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Here is the instruction show you guide on how to remove MTU 12V4000 engine injector.

1. Shut off fuel supply to engine.
2. Remove cylinder head cover

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Removing injector
1. Disconnect cable connector on injector.
2. Remove HP fuel line (4).
3. Remove return line (5).
 

Note: The injector accumulator will be emptied when removing the adapter.
4. Remove adapter (3).
5. Remove screw (2) and take off hold-down clamp (1).
6. Install installation/removal tool on cylinder head.
7. Remove injector with installation/removal tool.MTU DiaSys 2.74
8. Remove installation/removal tool.
9. Remove sealing ring (4) from injector or use a self-made hook to take it out of the cylinder head.
10. Remove O-rings (3), O-ring (2) and damper ring (1) from injector.
11. Clean all mating and sealing surfaces.
12. Cover all connections and bores, or seal with suitable plugs.