11 36 148 Removing And Installing / Replacing Right Inlet VANOS Gear (S85)

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Special tools required:

11 5 100
11 5 291
11 5 292
11 5 301
11 5 320
11 5 351
11 5 370
11 5 381
11 5 410

Necessary preliminary tasks:

Remove right 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 inlet camshaft, cylinders 1-5.

Designation (E1) on dihedron points upwards.

Fig 2: Identifying Designation (E1) On Dihedron Points Upwards

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Rotate exhaust camshaft with open-end wrench (1) at hexagon head in direction of arrow until special tool A 11 5 301 can be attached.

Designation (A1) on dihedron points upwards.

NOTE: Exhaust VANOS gear (2) adjusted in direction of arrow (advance).

Fig 3: Rotating Exhaust Camshaft

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Disconnect inlet and exhaust camshafts.

Attach special tool A 11 5 301.

Attach special tool E 11 5 301 and secure with bolts (2).

IMPORTANT: Screw in bolts (2) without fail, risk of damage to camshafts.

Fig 4: Identifying Special Tool A 11 5 301 And E 11 5 301

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

Insert M8x18 hexagon socket screw (2) into exhaust 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 exhaust VANOS gear (1) will result in rattling noises at idle.

Fig 6: Identifying Special Tool 11 5 370 And Gearwheel

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

Installation:

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

NOTE: Illustration shows cyl. 6-10.

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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Remove right chain tensioner.

Installation:

Replace sealing ring.

Tightening torque: 11 31 1AZ. See 11 31 CAMSHAFT .

NOTE: Illustration shows cyl. 6-10.

Fig 9: Identifying Right Chain Tensioner

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Remove screw plug for chain rail on right cylinder head.

Installation:

Replace sealing ring.

Tightening torque 11 12 9AZ. See ENGINE - TIGHTENING TORQUES .

Insert special tool 11 5 291.

Secure bearing pin against falling out with special tool 11 5 292.

Fig 10: Identifying Special Tool 11 5 291 And 11 5 292

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Attach special tool 11 5 381.

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

IMPORTANT: Release central bolts (1 and 2) with special tools 11 5 410 and 11 5 381 only.
Risk of damage to VANOS gear.

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.

Release central bolts (1 and 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 bolts (1 and 2).

Fig 11: Identifying Special Tool 11 5 381, 11 5 410 And Central Bolts

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IMPORTANT: Danger of injury!

Installation:

If the VANOS gear is to be reused, the special tool 11 5 381 must not be removed.

VANOS gear is tensioned.

Tilt special tool 11 5 381 in direction of arrow.

If the VANOS gear is to be replaced by a new part, the special tool 11 5 381 can be removed.

Remove VANOS gear with special tool 11 5 381.

Fig 12: Tilting Special Tool 11 5 381

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IMPORTANT: Danger of injury!

Installation:

If the VANOS gear is to be reused, the special tool 11 5 381 must not be removed.

VANOS gear is tensioned.

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

Fig 13: Identifying VANOS Gear And Special Tool

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Remove both VANOS gears.

IMPORTANT: Do not allow timing chain to fall into the engine compartment.
It is possible for the timing chain to become blocked on the VANOS high-pressure pump - risk of damage!

Insert special tool 11 5 351 into chain drive.

Press sliding rails (1) together.

Pretension timing chain with special tool 11 5 351.

Fig 14: Identifying Special Tool 11 5 351 And Sliding Rails

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Installation:

Position inlet VANOS gear (2) so that one of the three screws with washers points downwards.

Position exhaust VANOS gear (1) so that one of the three screws with washers points downwards.

M8x18 hexagon socket screw points upwards.

Check that timing chain is in correct installation position.

Insert central bolts (1 and 2) without play.

Installation:

Replace central bolts (1 and 2).

Fig 15: Identifying Inlet VANOS Gear And Exhaust VANOS Gear

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Insert bearing pin with special tool 11 5 291 into sliding rail.

Tightening torque 11 31 2AZ. See 11 31 CAMSHAFT .

Remove special tools 11 5 291 and 11 5 292.

Install screw plug for chain rail on right cylinder head.

Installation: Replace sealing ring.

Tightening torque: 11 12 9AZ. See 11 12 CYLINDER HEAD WITH COVER .

Fig 16: Identifying Special Tools 11 5 291 And 11 5 292

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Insert chain tensioner with sealing ring. Tightening torque: 11 31 1AZ. See 11 31 CAMSHAFT .

NOTE: Illustration shows cyl. 6-10.

Fig 17: Identifying Chain Tensioner

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If necessary, remove transportation lock from VANOS gear. Insert special tool 11 5 381 between outer sleeve and gearwheel. Fit special tool 11 5 410. Remove M8x18 hexagon socket screw or special tool 11 5 370.

IMPORTANT: Secure central bolts (1 and 2) with special tools 11 5 381 and 11 5 410 only.

Tighten central bolts (1 and 2). Tightening torque: 11 36 1AZ. See 11 36 VARIABLE CAMSHAFT CONTROL .

Fig 18: Identifying Exhaust VANOS Gear And Special Tool 11 5 381 (2 Of 2)

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Remove special tools 11 5 381 and 11 5 410. Release hexagon socket screws with washers (1 and 2) through 90°.

Fig 19: 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 20: Identifying Thrust Bearing Plates

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Installation: VANOS adjustment unit is 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.

IMPORTANT: Risk of mixing up parts!

Fig 21: Identifying Lettering EIN On Inlet Camshaft (1 Of 2)

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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 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 22: Identifying VANOS Adjustment Unit, Thrust Bearing Plates And VANOS Gears

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

IMPORTANT: All 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 23: Locating VANOS Adjustment Unit Bolts

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Installation: Check seal for correct seating.

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

Fig 24: Identifying VANOS Adjustment Unit 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.

Fig 25: Identifying Hexagon Socket Screws

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IMPORTANT: Remove all special tools - risk of damage.

Continue cranking engine at hexagon head or with special tool 11 5 100 120° camshaft 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 VANOS camshafts are moved in the direction of the arrow (retard stop). Illustration shows cyl. 1 to 5.

Fig 26: Identifying Special Tool 11 5 100

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Check timing. Assemble engine.