Removing and installing valve springs - RA05001192500X(05-2500)

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.

Preceding work:

Camshafts removed (05-2200) .

Spark plugs removed (15-1031) .

Operation no. of operation texts and work units or standard texts and flat rates 05-3500

Models 124, 129, 140

Fig 1: Identifying Valve Springs Remove/Install Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Right cylinder head: engine wiring harness	disconnect, connect.
Supporting bar (2) with slide (7)	attach off-center (facing toward outside of vehicle) to relevant cylinder head, take off, special tool 111 589 01 59 00.
Supporting bar (2)	bolt on X with two M7 35 bolts (bolts of camshaft bearing caps), unbolt.
Timing chain	raise and turn piston of cylinder to be machined with wrench socket to TDC. If turning at the crankshaft, ensure that the starting position is restored so that the coloured markings affixed to the timing chain can be reused for setting the timing of the camshafts. The respective piston is in the TDC position if the marking numbers on the vibration damper, shown in the drawing above, are aligned with the TDC pointer.

MARKING NUMBER PISTON IN TDC

0	1 and 6
90	5 and 3
180	4 and 7
270	8 and 2

Fig 2: Identifying Valve Springs Remove/Install Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Bucket tappet (3) of relevant cylinder	remove, install (05-2110) .
Connection hose (4) of cylinder leak tester	screw into spark plug hole.
Crankshaft	fix in position with retaining lock to prevent it rotating (03-5000) .
Compression chamber	pressurise.
Lever presser (9) with thrust piece (5)	insert into slide (7), special tools 111 589 18 61 00 and 119 589 06 63 00.
Thrust piece (5)	attach to valve spring retainer (15) vertically.
Slide (7)	fix in position with bolt (8).
Valve spring (17)	compress. Valves must not touch the piston crown otherwise they will be bent.
Valve collects (14)	remove with tweezers (6) or magnetic finger, install, special tool 116 589 06 63 00. Installation note Coat valve spring retainer (15) for fixing valve collects (14) with grease.
Valve spring retainer (15) with valve spring (17)	remove, install.
Valve stem seal (19)	replace (05-2700) .
Bottom valve spring retainer (20)	remove and examine for scoring, install.

Special tools

Fig 3: Identifying Special Tool (111 589 18 61 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 4: Identifying Special Tool (111 589 01 59 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 5: Identifying Special Tool (119 589 06 63 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 6: Identifying Special Tool (116 589 06 63 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

COMMERCIALLY AVAILABLE TOOLS

Cylinder leak tester	e.g.	Bosch E F A W 210 A Sun, CLT 228
Rubber suction cup Ø 30 mm	e.g.	Hazet Nr. 735-2
Straight tweezers 160 mm with rounded tips	e.g.	Stahlwille D-42331 Wuppertal 12

NOTE: Valve springs, upper and lower valve spring retainers with scoring must be replaced. The valve springs of the inlet and exhaust valves are identical.

As of 01/1993 conical-shaped valve springs are installed together with modified valve spring retainers and lighter bucket tappets. The inner valve spring is no longer fitted.

CONICAL-SHAPED VALVE SPRINGS

	Valve spring wire dia. (round)	Valve spring wire dia. (oval)
Engine 119.971/975	3.5 mm	-
Engine 119.970/972/ 974	-	3.4 - 4.2 mm

Preceding work:

Camshafts removed (05-2200) .

Spark plugs removed (15-1031) .

Operation no. of operation texts and work units or standard texts and flat rates 05-3500

Model 210

Fig 7: Identifying Conical-Shaped Valve Springs

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Lift up timing chain and rotate piston of cylinder to be machined to TDC with wrench bit see table for piston in TDC.

MARKING INDEX PISTON IN TDC

0	1 and 6
90	5 and 3
180	4 and 7
270	8 and 2

Bucket tappet (3) of the relevant cylinder	remove, install (05-2110) .
Connection hose (4) of cylinder leak tester	screw into spark plug hole.
Crankshaft	fix in position with retaining lock to prevent it turning (03-5000) .
Compression chamber	pressurize.
Hinged clevis (7a)	insert into appropriate hole of the camshaft bearing cap in cylinder head.
Lever depresser (9)	attach with thrust piece (5) to hinged clevis (7a) in the appropriate hole, special tools 111 589 18 61 00, 119 589 10 63 00 and 119 589 06 63 00.
Thrust piece (5)	position vertically onto valve spring retainer (15).
Valve spring (17)	compress. The valves must not strike the piston crown otherwise they will be bent.
Valve collects (14)	remove, install with tweezers (6), magnetic finger, special tool 116 589 06 63 00 Installation note Coat valve spring retainer (15) with grease for fixing the collects (14) in position.
Valve spring retainer (15) together with valve spring (17)	remove, install.
Valve stem seal (19)	replace (05-2700) .
Bottom valve spring retainer (20)	remove and inspect for pitting, install.

Special tools

Fig 8: Identifying Special Tool (111 589 18 61 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 9: Identifying Special Tool (119 589 10 63 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 10: Identifying Special Tool (119 589 06 63 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 11: Identifying Special Tool (116 589 06 63 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

COMMERCIALLY AVAILABLE TOOLS

Cylinder leak tester	e.g.	Bosch E F A W 210 A Sun, CLT 228
Rubber suction cup Ø 30 mm	e.g.	Hazet Nr. 735-2
Straight tweezers 160 mm with rounded tips	e.g.	Stahlwille D-42331 Wuppertal 12