Removal and installation of piston LB3 - AR27.30-P-0660-01A

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.

Fig 1: Identifying Sleeve (126 589 02 14 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Assembly Device (201 589 12 43 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Removal

Remove Teflon rings (9) from annular grooves in front cover.

Fig 3: Identifying Teflon Ring
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Place assembly device (020) on the spring plate (13) and clamp until the snap ring (15) is released.
Remove snap ring (15).
Release and remove assembly device (020).

Fig 4: Identifying Assembly Device, Spring Ring And Snap Ring
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Remove spring plate (13) and backpressure springs (14) for piston LB3 (12).
Withdraw piston.

Fig 5: Identifying Spring Plate, Backpressure Springs And Piston LB3
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Installation
Check radial lip-type sealing rings (16, 17) and replace, if necessary.
Install radial lip-type sealing rings (16, 17).

Install radial lip-type sealing rings so that the sealing lip points downwards (in direction of arrow).

Fig 6: Direction Of Sealing Lip Points
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Place sleeve (024) on front cover (10).
Lubricate sliding surfaces for the radial lip-type sealing rings.
Insert piston LB3 (12).

The journal (on the piston) and the bore (in the front cover) must align. Carefully press down piston without tilting it over, it may be necessary to push on the outer radial lip-type sealing ring (arrow) with a pin.
Remove sleeve (024).

Fig 7: Pushing Outer Radial Lip-Type Sealing Ring
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Mount backpressure springs (14) and spring plate (13) for the piston LB3 (12).

Number of backpressure springs: 20 pieces

Fig 8: Identifying Backpressure Springs And Spring Plate For Piston LB3
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Place and clamp assembly device (020) on the spring plate
Insert snap ring (15).
Release and remove assembly device.

Fig 9: Identifying Assembly Device And Snap Ring
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Insert Teflon rings (9) in annular grooves in front cover.
Ensure that the splits in the Teflon rings (9) are in alignment. If necessary remove the rings and shape to a smaller diameter.

Fig 10: Identifying Teflon Ring
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.