Removing and installing valve springs and valve stem seals - AR05.30-D-3510-02A

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 Retaining Wheel (603 589 01 40 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Pliers (606 589 00 37 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying Valve Assembly Tool Case (111 589 25 61 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 4: Identifying Assembly Board (601 589 01 59 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

1.1 If cylinder head removed:
Bolt cylinder head to assembly board 601 589 01 59 00 with four cylinder head bolts (arrows).

Only if cylinder head removed.

Fig 5: Locating Cylinder Head Bolts
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
1.2 If cylinder head installed: insert retaining wheel (01).

Fig 6: Identifying Retaining Wheel
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
2 Insert matching guide bush (11) into bucket tappet bore, screw detent with pivot bearing with suitable retaining fork (17) into thread of camshaft bearing cap and align.
Do not use the threads of the cylinder head cover as the cylinder head cover is attached with self-tapping bolts.

Fig 7: Identifying Retaining Fork
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
3 Assemble thrust fork (6) with lever handle (3).
4 Insert assembly cartridge (9) into the guide bush (11). Attach thrust fork (6) to the mating bearing (18) and position at the mounting pins of the assembly cartridge (9).
5 Apply slight pressure to thrust fork (6) and to knurled screw and at the same time slowly rotate the knurled screw of the assembly cartridge (9) (arrow) until the inner locating drift with its tips is felt to engage between the valve collects.

Fig 8: Inserting Assembly Cartridge Into Guide Bush
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
6 Apply slight pressure with your thumb to the knurled screw of the assembly cartridge (9) and press thrust fork (6) down as far as the stop (use extension if necessary). The valve collects are removed automatically.
7 Slacken thrust fork (6) and take off.
8 Take out assembly cartridge (9) with the removed valve collects.
The valve collects can remain in the assembly cartridge until installed but all the valve springs or valves should be removed, e.g. if cylinder head removed it is then possible to take the valve collects out of the assembly cartridge by pulling out the knurled screw.

Fig 9: Pressing Thrust Fork
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
9 Check whether the valve collects are in the assembly cartridge (9) and repeat steps 5 to 8, if necessary.
10 Take out guide bush (11).

Fig 10: Identifying Assembly Cartridge And Guide Bush
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
11 Remove top valve spring retainer (3) and valve spring (4).

Fig 11: Identifying Top Valve Spring Retainer And Valve Spring
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
12 Use pliers to pull valve stem seal (5) off the valve stem.
13 Take out bottom valve spring retainer, inspect for pitting, replace if necessary and re-insert. Inspect valve stem for pitting, remove if necessary.

Fig 12: Pulling Valve Stem Seal
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
14 Fit protective cap (12) (contained in parts supplied) onto the valve stem (6) and oil well.
15 Insert new valve stem seal (5) into assembly drift and press onto valve stem (6) as far as the stop.
16 Take off protective cap (12).

Fig 13: Identifying Valve Stem Seal, Valve Stem And Protective Cap
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
17 Insert valve spring and top valve spring retainer.
18 Insert guide bush (11) into the cylinder head.

Fig 14: Identifying Guide Bush
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
19 Insert assembly cartridge (9) with valve collects inside into the guide bush (11), attach thrust fork (6) to mating bearing (18) and position with slight pressure onto the two mounting bolts of the assembly cartridge (9).
20 Press down thrust fork (6) (arrow). Pull the knurled screw of the assembly cartridge (9) up (arrow), this releases the pressure on the thrust fork (the valve collects are thus installed).

Fig 15: Inserting Assembly Cartridge With Valve Collects Inside Into Guide Bush
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
21 Check whether the valve collects (9) are correctly inserted; repeat steps 3 to 9 and 18 to 20, if necessary.
22 Detach all the special tools from the cylinder head.

Fig 16: Identifying Valve Collects
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.