604 589 00 40 00 Retaining device - WS05.00-P-0169C
WARNING: This page is about a different car, the 2009 Mercedes-Benz E550 and 2008 Mercedes-Benz E550. However, it is still accessible from the selected car via links, so may be relevant.
FG 05/Set C
ENGINE 604, 605, 606
Use:
Retaining device for timing chain on chain sprocket for pulling timing chain into engine (retaining device prevents timing chain from jumping on chain sprocket)