Replace chain tensioner sealing ring - AR05.10-P-7800-04OLD

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2016 Mercedes-Benz E63 S AMG, 2016 Mercedes-Benz E400, 2016 Mercedes-Benz E350, 2016 Mercedes-Benz E300, and 2016 Mercedes-Benz E250. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE 651

Clamp chain tensioner (1) into the vise.
Use protective jaws.
Unfasten the sealing ring (2) using a small screwdriver (arrow), pry off and remove.
Do not damage the sealing surface of the chain tensioner (1) in the process.

Leaks can occur otherwise.
Check sealing surfaces on cylinder head and chain tensioner (1) for damage and check for any adhering residues.
If necessary clean sealing surfaces on cylinder head and chain tensioner (1).
Check oil feed bore for chain tensioner (1) for dirt and foreign objects.
If necessary clean oil feed bores of the chain tensioner (1).
Lay on a new sealing ring (2) by hand and pre-center with slight pressure on the centering collar (1a).
Always replace the sealing ring (2). Do not fully press on sealing ring (2) yet. The sealing ring (2) adopts the correct position when screwing in the chain tensioner (1). Do not use any additional lubricant or sealant.
Remove camshafts (1) from vise.

Fig 1: Removing Chain Tensioner Sealing Ring
Courtesy of MERCEDES-BENZ USA