Camshaft: Adjustments

11 31 575 - Adjusting camshaft timing (S85)

Special tools required:
- 11 3 302
- 11 5 100
- 11 5 301 11 5 300 Gauge
- 11 5 302 11 5 300 Gauge
- 11 5 320 11 5 320 Plug mandrel

Important!
Do not crank engine in reverse direction.

Crank engine forward in clockwise direction only.

Risk of damage to VANOS gears.

Necessary preliminary tasks:
- Remove left Removing and Installing / Replacing Left VANOS Adjustment Unit (S85) VANOS adjustment unit.
- Remove right Removing and Installing / Replacing Right VANOS Adjustment Unit (S85) VANOS adjustment unit.

Important!
Both inlet and exhaust camshafts can be adjusted in the 1st cylinder firing TDC position.

The procedure for checking timing Testing and Inspection is different from that for adjusting.

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

Position of inlet camshaft, cylinders 1-5.

Designation (E1) on dihedron points upwards.

Position of inlet camshaft, cylinders 6-10.

Designation (E2) on dihedron points upwards.

Rotate exhaust camshaft with open-end wrench (1) at hexagon head in direction of arrow until special tool A 11 5 301 11 5 300 Gauge can be attached.

Designation (A1) on dihedron points upwards.

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

Rotate exhaust camshaft at hexagon head with an open-end wrench (2) in direction of arrow until special tool A 11 3 302 can be attached.

Designation (A2) on dihedron points upwards.

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

Remove spacers (1) from special tools E 11 5 301 11 5 300 Gauge and E 11 5 302 11 5 300 Gauge.

Attach cylinder (1-5) special tools A 11 5 301 11 5 300 Gauge and E 11 5 301 11 5 300 Gauge, secure with bolts (2).

Attach cylinder (6-10) special tools A 11 5 302 11 5 300 Gauge and E 11 5 302 11 5 300 Gauge, secure with bolts (1).

Release all hexagon socket screws with washers (1 and 2), cylinders 1-5 and 6-10.

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

Note:
Illustration shows cyl. 6-10.

Important!
Do not release central bolt, cyl. 1-5.

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.

Installation Note:
Release hexagon socket screws with washers again through 90°.

Important!
Do not release central bolt, cyl. 6-10.

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.

Installation Note:
Release hexagon socket screws with washers again through 90°.

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

Both thrust bearing plates (1) must be retracted.

Clean sealing surfaces.

Installation Note:
Replace seal.

Installation Note:
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.

Important!
Risk of mixing up parts!

Installation Note:
VANOS adjustment units are marked to avoid being mixed up.

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

Cylinder assignment (2), cyl. 6-10.

Important!
Risk of mixing up parts!

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

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

Release hexagon socket screws without washers (1) 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 Note:
Both outer sleeves rotate clockwise and retract approx. 8 mm.

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

The procedure is identical for cylinders 1-5 and 6-10.

Installation Note:
Check seal for correct seating.

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

Tighten down accessible hexagon socket screws of all camshafts at cylinders 1-5 and 6-10 with and without washers to 10 Nm.

Installation Note:
Mark all screws which are already tightened down with a coloured dot.

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 socket screws with and without washers can be inserted on the VANOS gear and tighten down to 10 Nm.

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

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

Check timing Testing and Inspection.

Assemble engine.