611 589 01 40 00 Retainer device - WS03.00-N-3102B

FG 03/05/Set B 

ENGINES 612, 611, 612, 647, 611, 612, 613, 629, 646, 647, 648, 611, 646 

Use: 

Holding device for pulling in the timing chain. Hold timing chain meshed with camshaft sprocket.

Fig 1: Identifying Retainer Device (611 589 01 40 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.