Open and close coupling - AR09.41-P-1311-01AL

Engine 152, 156, 157, 266, 270, 271, 272, 273, 274, 275, 276, 278, 607, 629, 640, 642, 646, 651 

Open coupling 

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

   Do not pull on the eyelet (1) as the catch spring (3) will lose pretension.

2. Detach hose on component.
3. Replace seal.

   Close coupling 

4. Slide nose (2) of catch spring (3) to position (A).
5. Slide hose onto component until the catch spring (3) latches.
6. Check connection by pulling a little at the hose.

Fig 1: Identifying Open And Close Coupling

Courtesy of MERCEDES-BENZ USA