Detach/attach front cover - AR01.30-P-5703-01AO

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.

CYLINDER HEAD

Number	Designation			Engine 120
BA01.30-P-1001-01B	Bolt of front cover at top	M6	Nm	-
BA01.30-P-1001-01B	Bolt of front cover at top	M8	Nm	25

CAMSHAFT

Number	Designation		Engine 120
BA05.20-P-1002-01F	Bolt of driver to inlet camshaft	Nm	16

ECI IGNITION SYSTEM

Number	Designation		Engine 120
BA15.12-P-1001-01C	Bolt of distributor rotor at driver	Nm	≈2.5

Fig 1: Identifying Sleeve (103 589 01 14 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 2: Identifying Torx Bit Set (000 589 01 10 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 3: Identifying Sleeve (03 589 01 14 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1013-01A	Sealant	A 003 989 98 20

Engine 120.980/981: Remove distributor rotor and driver (4).
Installation : The groove of the driver (4) must latch into the locating pin (arrow) in the camshaft
Engine 120.980/981: Remove protective cover and sealing ring
Remove power steering pump reservoir with hoses toward top

Fig 4: Locating Pin
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Unscrew bracket (11), remove.

Fig 5: Identifying Unscrew Bracket And Hexagon Socket Head Screw With Washer
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Unscrew connecting pipe (12) at power steering pump (12)
Installation : Replace sealing ring.

Fig 6: Identifying Power Steering Pump
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Unscrew bolts (arrows), remove front cover.
Install new shaped rubber gasket and O-ring of coolant duct in the front cover.
Clean sealing surfaces of front cover of cylinder head and shaped nut of timing case cover.

Fig 7: Locating Bolts And Right Front Cover
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Check shaped gaskets (arrows of slide rail bridge cover (13) for damage and replace if necessary.

Fig 8: Locating Gaskets On Slide Rail Bridge Cover
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Apply the sealing compound Loctite 5970 punctual at the joint to the cylinder head on left and right (arrows) in the oil-free groove of the timing case cover.
Place newly dried shaped gasket (without sealing compound) in the oil-free groove. Slightly coat the top side of the shaped rubber gasket with engine oil.
Coat front cover at the contact surfaces to the cylinder head with sealing compound Loctite 5970

Fig 9: Locating Cylinder Head Joint
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Engine 120.980/981: Place assembly sleeve (1) 103 589 01 14 00 onto the exhaust camshaft. Coat lip of radial sealing ring (2) with engine oil.
Mount front cover.
When installing the front covers ensure, that the bottom shaped rubber gasket (arrows) is not displaced, for this purpose break the edge at the bottom of the cover.

On the left cover, unscrew screw plug (31), remove sliding rail pin, reinstall after assembly.

Fig 10: Identifying Sleeve, Radial Sealing Ring And Unscrew Plug
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Mount bolts according to bolt diagram, first of all tighten the lower bolts.
Mount left front cover with lower bolt (2).

Fig 11: Identifying Left Front Cover
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Fig 12: Identifying Right Front Cover
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.