Removal and installation of the chain tensioner - ra05006010310x(0310)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Engines 601, 602 (except 602.98), 603

Operation no. of operation texts and work units or standard texts and flat rates 05-7800

Fig 1: Identifying Chain Tensioner

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Turbocharged engines: boost air hose (2) to valve body	detach, attach.
Chain tensioner (1)	remove, install, 80 Nm. Replace seal and install chain tensioner filled with SAE 10 engine oil. NOTE: Chain tensioners which are the subject of problems should be replaced complete.

Filling chain tensioner with engine oil:

Place chain tensioner with the plunger bolt downwards in SAE engine oil until over the collar on the hexagon. Press plunger up to the stop

7 - 10 times slowly with the aid of a press or power drill.

It should be possible to compress the chain tensioner quite slowly, evenly and with little effort after filling with oil.

NOTE: A modified valve disk (231) has been installed in the chain tensioner since 08/84 in order to limit to peak pressures of the chain tensioner on the tensioner rail.

Fig 2: Section View Of Chain Tensioner

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The outer diameter of the sealing surface on the chain tensioner housing has been enlarged by

2 mm since 07/87 making it necessary to install a sealing ring (237) with dimensions of 27 X 32 mm (previously 25 X 30).

Fig 3: Identifying Chain Tensioner Dimension

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

This modification prevents the formation of burrs on the sealing ring (picture, circular cut-out) when tightening the chain tensioner.

This chain tensioner can also be built into vehicles of earlier manufacture.

Special tool

Fig 4: Identifying (001 589 66 21 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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