11 36 010 Removing And Installing, Sealing/Replacing VANOS Adjustment Unit (S54): Installation

The installation of the VANOS adjustment unit is described separately from the removal. The assembly sequence for removal and installation is different.

NOTE: Procedure for replacement or new parts: When delivered, the hydraulic pistons (1) of the VANOS adjustment unit are "retracted" and the hexagons are not accessible. Fit special tool 11 7 130 to VANOS adjustment unit.

CAUTION: Oil is sprayed when compressed air is connected. Cover bore (2) with a cloth.

Connect compressed air (2 to 8 bar).

Fig 1: Installing Special Tool To VANOS Adjustment Unit

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Connect special tool 12 6 050 in conjunction with special tool 12 6 411 to solenoid valves of VANOS adjustment unit.

Connect special tool 12 6 411 to correct terminals on car battery.

Press buttons 2 and 4 on special tool 12 6 050. The solenoid valves are activated and the oil chamber of the hydraulic piston is ventilated. The hydraulic pistons (1) extend.

Disconnect compressed air from special tool 11 7 130. Remove special tool 11 7 130 from VANOS adjustment unit.

Fig 2: Disconnecting Compressed Air From Switching Unit

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NOTE: A filter is integrated in the control valve.

In the event of engine damage which suggests that the filter is contaminated with swarf/chips, it is essential to replace the control valve.

Replace sealing rings (1) and coat with oil as antiseize agent.

Preassemble controlled valve in cylinder head.

Fig 3: View Of Sealing Rings

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Check dowel sleeves (1) for damage and correct installation position.

Fig 4: Checking Dowel Sleeves

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Replace gasket (1).

CAUTION: Note direction of installation of gasket. Install gasket (1) in such a way that beading points to VANOS adjustment unit. Secure gasket (1) with sealing compound on.

Fig 5: Replacing Gasket

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Place VANOS adjustment unit on toothed shafts (1).

Fig 6: Placing VANOS Adjustment Unit On Toothed Shafts

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CAUTION: CCW thread! When tightening down toothed shafts, support VANOS adjustment unit with your hand. Grip on dihedron (1) and screw together at hexagon (2) alternately between exhaust and inlet sides in 1/2 turn increments.

Tighten down screw connection of toothed shaft on inlet and exhaust sides.

Tightening torque 10 N.m.

Fig 7: Locating Dihedron And Hexagon

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Align radial piston pump to driver on spline hub.

NOTE: Picture shows a schematic representation.

Fig 8: Aligning Radial Piston Pump To Driver On Spline Hub

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Press buttons 1 and 3 on special tool 12 6 050 simultaneously. The solenoid valves are activated and the air can escape from the hydraulic pistons of the VANOS adjustment unit.

Simultaneously push on VANOS adjustment unit until it rests on cylinder head.

CAUTION: If this position is not reached, check position of radial piston pump to driver and realign if necessary.

Fig 9: Identifying Buttons 1 And 3 On Switching Unit

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Insert screws of VANOS adjustment unit and tighten down.

Fig 10: Locating Screws Of VANOS Adjustment Unit

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NOTE: Check installed direction.

Install holder (4)

Fig 11: Installing Holder

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Insert screws (3) and secure holder (4) (do not tighten down screws (3) yet)
Install sliding rail (2).
Insert screws (1).
Tighten down screws (1) and screws (3).

Fig 12: Installing Sliding Rail
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Disconnect special tool 12 6 050 and special tool 12 6 410 and remove.

Insert screw connections in solenoid valves.

Fig 13: Inserting Screw Connections In Solenoid Valves

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Replace sealing rings of banjo bolt.

Insert banjo bolt but do not tighten down yet.

Fig 14: Inserting Banjo Bolt

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Install bracket of oil line. Install screw and tighten down.

Fig 15: Installing Bracket Of Oil Line

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Tighten down banjo bolt of oil line.

Tightening torque, refer to 11 36 9AZ in ENGINE - TIGHTENING TORQUES .

Assemble engine.

Fig 16: Tightening Down Banjo Bolt Of Oil Line

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CAUTION: There is air in the VANOS system once it is opened. In the first few seconds after startup this results in a clearly discernible "rattling noise". This rattling noise does "not" indicate incorrect assembly. The rattling noise will disappear as soon as the oil pressure has built up and the system has vented.