11 36 144 Removing And Installing / Replacing Left Exhaust VANOS Gear (S85)

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Special tools required:

11 5 100
11 5 302
11 5 320
11 5 370
11 5 382
11 5 410

Necessary preliminary tasks:

Remove left VANOS adjustment unit .

IMPORTANT: Both inlet and exhaust camshafts can be adjusted in the 1st cylinder firing TDC position.
The procedure for checking timing is different from that for adjusting.

Secure special tool 11 5 320 to vibration damper in 1st cylinder firing TDC position.

Fig 1: Identifying Special Tool 11 5 320

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Position of camshafts, cyl. 6-10, in 1st cylinder firing TDC position.

Dihedron of camshafts is vertical to cylinder axis, lettering of camshaft points upwards (E2).

Fig 2: Identifying Designation On Dihedron Points Upwards

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Rotate exhaust camshaft at hexagon head with an open-end wrench (2) in direction of arrow until special tool A 11 5 302 can be attached.

Designation (A2) on dihedron points upwards.

NOTE: Exhaust VANOS gear (1) adjusted in direction of arrow.

Fig 3: Rotating Exhaust Camshaft At Hexagon Head

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Disconnect inlet and exhaust camshafts.

NOTE: Rotate exhaust camshaft at hexagon head, attach special tool A 11 5 302.

Attach special tool E 11 5 302 and secure with bolts (1).

IMPORTANT: Screw in bolts (1) without fail, risk of damage to camshafts.

Fig 4: Identifying Special Tool E 11 5 302 And A 11 5 302

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IMPORTANT: Removal/installation is not possible without hexagon socket screw (1).
Hexagon socket screw (1) with washer must not be longer than 18 mm.
Gearwheels (2 and 3) of exhaust VANOS gear are tensioned with a spring.

Insert M8x18 hexagon socket screw (1) into VANOS gear.

Fig 5: Identifying Gearwheels Of Exhaust VANOS Gear

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Installation:

If the hexagon socket screw is released or forgotten by mistake, the gear teeth can be readjusted with special tool 11 5 370.

Screw in special tool 11 5 370 until gearwheel (1) lines up with bore (see arrow) on thread.

Failure to tension the VANOS gear will result in rattling noises at idle.

Fig 6: Identifying Special Tool 11 5 370 And Gearwheel

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Release hexagon socket screws with washers (1 and 2).

Installation:

Replace hexagon socket screws with washers (3 and 4).

Fig 7: Identifying Hexagon Socket Screws With Washers

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IMPORTANT: Release central bolt only when inner sleeves (1 and 2) with elongated holes are at left stop.

Pull VANOS gear with outer sleeve forwards until inner sleeves (1 and 2) with elongated holes are at left stop.

Join hexagon socket screws with washers (3 and 4) to 5 Nm

Fig 8: Pulling VANOS Gear With Outer Sleeve Forwards

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Attach special tool 11 5 382.

Fit special tool 11 5 410 with bolts (3).

IMPORTANT: Release central bolt (2) with special tools 11 5 410 and 11 5 382 only.

NOTE:

If the special tool 11 5 410 cannot be fitted due to the hexagon socket screws being unfavorably positioned, it is necessary to remove the two or if necessary four hexagon socket screws.

Fig 9: Identifying Special Tool 11 5 410 And 11 5 382

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Release central bolts (2).

Remove special tool 11 5 410.

NOTE:

If the central bolt is released, the removed hexagon socket screws are reinstalled with a joining torque of 5 Nm.

Installation:

Replace central bolt (2).

IMPORTANT: Danger of injury!

Installation:

If the VANOS gear is to be reused, the special tool 11 5 382 must not be removed.

VANOS gear is tensioned.

Tilt special tool 11 5 382 in direction of arrow.

If the VANOS gear is to be replaced by a new part, the special tool 11 5 382 can be removed.

Remove VANOS gear with special tool 11 5 382.

Fig 10: Tilting Special Tool 11 5 382

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IMPORTANT: Danger of injury!

Installation:

If the VANOS gear is to be reused, the special tool 11 5 382 must not be removed.

VANOS gear is tensioned.

Set down VANOS gear (1) with special tool (2).

Fig 11: Identifying VANOS Gear And Special Tool

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Install exhaust VANOS gear (2) in position.

Installation:

M8x18 hexagon socket screw points upwards.

One of the three screws points downwards.

Insert central bolt, join slightly and then release again through 90°.

Remove M8x18 hexagon socket screw or special tool 11 5 370.

Fig 12: Identifying Exhaust VANOS Gear And Special Tool 11 5 382

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Insert special tool 11 5 382 between outer sleeve and gearwheel.

Fit special tool 11 5 410.

IMPORTANT: Secure and release central bolt (2) with special tools 11 5 410 and 11 5 382 only.
Risk of damage to VANOS gear.

Tighten central bolt (2).

Tightening torque 11 36 1AZ. See ENGINE - TIGHTENING TORQUES .

Remove special tools 11 5 410 and 11 5 382.

Release hexagon socket screws with washers (1 and 2) through 90°.

Fig 13: Identifying Special Tools 11 5 410 And 11 5 382

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Fig 14: Identifying Hexagon Socket Screws With Washers

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Installation:

Both thrust bearing plates (1) on the VANOS adjustment unit can be rotated.

Both thrust bearing plates (1) must be retracted.

Clean sealing surface (2).

Replace seal.

Fig 15: Installing Thrust Bearing Plates On VANOS Adjustment Unit

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IMPORTANT: Risk of mixing up

Installation:

VANOS adjustment units are marked to avoid being mixed up.

The lettering EIN (1) must point to the inlet camshaft.

Cylinder assignment (2), cyl. 1-5 or 6-10.

Fig 16: Identifying Lettering EIN On Inlet Camshaft

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Insert seal.

Position VANOS adjustment unit (4) with both outer bolts (1).

Both VANOS gears (2) are extended.

Align thrust bearing plates (3).

Push VANOS adjustment unit (4) forwards until thrust bearing plates (3) rest against VANOS gears (2).

Installation:

There is a visible gap of approx. 8 mm between VANOS adjustment unit and cylinder head.

Fig 17: Identifying VANOS Adjustment Unit, Thrust Bearing Plates And VANOS Gears

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NOTE: Illustration shows cyl. 1 to 5.

Insert hexagon socket screws (1) without washers and join to 5 Nm.

Release hexagon socket screws (1) without washers through 90° again.

IMPORTANT: All hexagon socket screws with and without washers must be released through 90°.

Screw in bolts (2) of VANOS adjustment unit uniformly in 1/2 turns.

Installation:

Both outer sleeves rotate clockwise and retract approx. 8 mm.

Both inner sleeves with elongated hole must rotate counterclockwise (see arrow).

Fig 18: Locating Hexagon Socket Screws

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Installation:

Check seal for correct seating.

Secure VANOS adjustment unit with screws (1 and 2).

Fig 19: Identifying VANOS Adjustment Unit With Screws

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Tighten down hexagon socket screws with and without washers to 10 Nm.

Installation:

Mark all screws which are already tightened down with a colored dot.

NOTE: Illustration shows cyl. 1-5.

Fig 20: Identifying Hexagon Socket Screws

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IMPORTANT: Remove all special tools risk of damage!

Continue cranking engine at central bolt or with special tool 11 5 100 120° cms until further hexagon sockets screws can be inserted on the VANOS gear and tighten to 10 Nm.

NOTE: First both the inlet camshafts are moved when the engine is cranked.

Both exhaust camshaft gears are moved in the direction of the arrow (retard stop).

Fig 21: Identifying Special Tool 11 5 100

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Check timing.

Assemble engine.