MTU 12V 4000 Crankcase Ventilation – Oil Separator Element Replacement Procedure

This procedure describes the replacement of the oil separator element, diaphragm testing, and crankcase ventilation for MTU 12V 4000 engines.

Related Content:

• Download of MTU DiaSys 2.74 2.72 engine diagnostic software
• MTU Diagnostic Tool USB-to-CAN (with MTU DiaSys 2.73)

Special Tools, Materials, and Spare Parts:

• MTU 12V 4000 Crankcase Ventilation Oil Separator Element Replacement Instruction
  

Replacing the Oil Separator Element

1. Remove the cover (2) with the O-ring (3).
2. Remove the filter element (1) from the housing (4).
3. Insert the new filter element into the housing (4).
4. Install the cover (2) with a new O-ring.
   
5. Using a torque wrench, tighten the cover screws (2) to the specified torque.
   
6. Replace the other oil separator elements in the same way.

Checking the Diaphragm

1. Remove the cover (4).
2. Remove the spring (5), seal (2), and diaphragm (3).
3. Check the diaphragm (3) for damage and replace it if it is damaged.
4. Fit the new diaphragm (3) in the housing (1).
5. Install the new seal (2) and spring (5) together with the cover (4).
6. 
7. Using a torque wrench, tighten the cover screws (4) to the specified torque.
8. 
9. Check the diaphragm of the other oil separator in a similar way.