Open, close coolant line coupling - AR20.20-P-7441-01RQ

ENGINE 133, 152, 156, 157, 159, 176, 177, 178, 266, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 607, 626, 629, 640, 642, 646, 651, 654 

Open clutch 

1. Slide nose (2) of catch spring (3) to position (B).

   Never pull on the eyelet (1).

   The catch spring (3) will lose its pretension otherwise.

2. Detach coolant line from component.
3. Replace sealing ring.

   Close clutch 

4. Slide nose (2) of catch spring (3) to position (A).
5. Push coolant line onto component until the catch spring (3) engages.

   Ensure clean free of grease connections.

6. Check connection by pulling slightly on the coolant line.
   Fig 1: Catch Spring

   Courtesy of MERCEDES-BENZ USA