Removing Unit Carrier (Coolant Distributor Housing)

1. 1.1. Loosen and unscrew M10 threaded bolts.
   1. 1.1.1. Screw two M10 nuts -1-  onto the M10 threaded bolts -2-  to lock them.
   2. 1.1.2. Unscrew M10 threaded bolts -2-  .
2. 1.2. Remove the engine carrier bracket -3-  .
3. 1.3. Clean the threaded bolts and thread in the crankcase (adhesive residue) and remove any traces of grease (using brake cleaner) by blowing out the threaded bore with compressed air.

Fig 1: Identifying Engine Carrier Bracket Threaded Bolts

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→ 137519 REMOVING AND INSTALLING VIBRATION DAMPER - section on "Removing".

Fig 3: Removing Vibration Damper

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1. 4.1. Loosen the vacuum line at the water connection piece -3-  .

   Unscrew one external Torx screw (E10, M6 x 12) -2-  on the water connection piece -3-  .

2. 4.2. Remove water connection piece -3-  .

   Unscrew three external Torx screws (E10, M6 x 25) -1-  on the bracket for the coolant pump -5-  and crankcase and remove the water connection piece -3-  .

Fig 4: Identifying Water Connection Piece

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The thermostat housing is in two parts, which can only be removed separately. Removing the unit carrier simply involves removing the intake tube -1- to the thermostat housing and loosening the thermostat housing underneath. 

1. 5.1. Remove coolant hose on the thermostat housing lid -1-  by releasing and pulling off the spring band clamp.
2. 5.2. Loosen one external Torx screw (E10, M6 x 40) -2-  by two to three turns.
3. 5.3. Loosen and unscrew two external Torx screws (E10, M6 x 12) -4-  on the intake coolant pipe -5-  at the thermostat housing and high-pressure pump holder.
4. 5.4. Pull intake coolant pipe -5-  out of the thermostat housing.
5. 5.5. Loosen and unscrew three external Torx screws (E10, M6 x 50) -3-  on the thermostat housing lid -1-  and remove the thermostat housing lid -1-  .
6. 5.6. Loosen and unscrew one external Torx screw (E10, M6 x 50) at the bottom of the thermostat housing.

Fig 5: Identifying Intake Tube And Thermostat Housing

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1. 1  - Bracket for coolant pump
2. 3  - External Torx screw, M8 x 50
3. 4  - External Torx screw, M8 x 50
4. 5  - External Torx screw, M6 x 20
5. 6  - External Torx screw, M8 x 25
6. 7  - M10 threaded bolt (already removed)

To remove the external Torx screw -4-, the tensioner must be turned and locked. 

Fig 6: Identifying Coolant Pump Bracket

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1. 6.1. Loosen and unscrew external Torx screws -3, 4, 5, 6-  .
2. 6.2. Remove bracket for coolant pump.
   1. 6.2.1. Turn bracket for the coolant pump -1-  slightly until the bars on the bracket for the coolant pump -1-  and thermostat housing -7-  are exposed -arrow-  .
   2. 6.2.2. Pull bracket for coolant pump -1-  off to the rear.

Fig 7: Removing Coolant Pump Bracket

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1. 7.1. Remove coolant connection piece.
   1. 1  - External Torx screws, M8 x 70
   2. 3  - Coolant connection piece
   3. 4  - External Torx screw, M8 x 50
   4. 5  - External Torx screw, M8 x 50
   5. 6  - Unit carrier
   6. 7  - Thermostat housing
   1. 7.1.1. Release spring clamps at the Henn couplings and pull off coolant hose at the coolant connection piece -3-  . Make sure that the spring clamps are not overstretched.
   2. 7.1.2. Release and pull off spring band clamp on coolant hose.
   3. 7.1.3. Loosen and unscrew three external Torx screws (E12, M8 x 70) -1-  and remove the coolant connection piece -3-  .
2. 7.2. Disconnect cable plug on the coolant temperature sensor.
3. 7.3. Unscrew three external Torx screws (E12, M8 x 50) -4, 5-  .
4. 7.4. Carefully pull the unit carrier -6-  off the thermostat housing -7-  and remove it.

Fig 8: Identifying Coolant Distributor Housing Unit Carrier

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