Adjusting the timing of the camshafts

NOTE: DANGER
High-voltage system.
The high-voltage system operates on the basis of hazardous, electrical voltage and high currents. Danger to life through electric shock!

All work on the high-voltage system may only be carried out by specially trained and technically experienced personnel.
For additional information see:
SAFETY INFORMATION ON HANDLING HYBRID CARS .
For additional information see:
NOTES ON REPAIR OF HIGH-VOLTAGE BATTERY UNIT .

NOTE: RISK OF DAMAGE
Damage to the engine.
The engine may be damaged if it is manually rotated in the wrong direction.

Turn the combustion engine exclusively by hand in the correct direction of rotation: a) Clockwise, facing the vibration damper or b) Counter-clockwise, facing the chain drive, (b) only applies when the rear timing chain is installed.

Preliminary works

Refer to REMOVING CHAIN TENSIONER .

Additional information is available.

NOTE: TECHNICAL INFORMATION
Assemble the tools for releasing and tightening the VANOS central valves depending on their accessibility.

Install a new chain tensioner

Replace sealing ring (1).
Parts: Sealing ring

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Tighten chain tensioner using the illustrated tool.

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Tighten chain tensioner (1) from below.

TIGHTENING TORQUES SPECIFICATION

Chain tensioner to cylinder head
Chain tensioner piston M22x1.5	Jointing torque	20 Nm
	Angle of rotation	30°

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Keep set of special tools 2 358 122 at hand:

Number	Description
1	Basic carrier
2	Screws (basic carrier on cylinder head)
3	Gauge to fix exhaust camshaft
4	Gauge to fix intake camshaft
5	Screw (gauge on basic carrier)

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Have the special tool 2 469 138 ready.

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Prepare all special tools and commercially available tools.

Number	Description
1	Standard torque wrench
2	Wrench socket 2 450 487
3	Reversible ratchet 0 496 855
4	Commercially available reduction
5	adapter 2 469 138

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Assemble all the special tools and commercially available tools as shown.

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To release the VANOS central valve (1) use the reversible ratchet (2) from the special tool 0 496 855 with the special tool 2 450 487.

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To release the VANOS central valve (1) use the special tool 0 496 855.

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Mount basic carrier (1) of the special tool 2 358 122.
If necessary, turn the crankshaft a little using the special tool 0 493 380 (11 6 480).
Mount the counter support (3) and loosen the VANOS central valve of the intake camshaft with the special tool 0 496 855.
If necessary, turn the crankshaft a little further using the special tool.
Mount the counter support (2) and loosen the VANOS central valve of the exhaust camshaft using the special tool 0 496 855.
Turn both camshafts into position so that the marks (1) on the exhaust and intake camshaft can be read from above.
Use the special tool 2 288 380 to block the crankshaft in the TDC firing position, cylinder (1).

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Check
- Check whether the middle one of the 3 flattened areas (1) on both camshafts points upwards. The special tool 2 358 122 can also be mounted if the camshafts are twisted by 180° (center flattened area points downwards).
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Result

» The middle one of the 3 flattened areas (1) does not point upwards.

Measure
- Turn the camshafts to the correct position so that the middle one of the 3 flattened areas (1) on both camshafts points upwards.
Secure the basic carrier (1) of the special tool 2 358 122 with the screws (2) on the cylinder head.
Position gauge (3) with the recess on the exhaust camshaft and fix with the screws (5) on the basic carrier (1).
Position gauge (4) with the recess on the intake camshaft and fix with the screws (5) on the basic carrier (1).

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Have the special tool 2 469 138 ready.

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Prepare all special tools and commercially available tools.

Number	Description
1	Commercial available torque wrench
2	Socket attachment 2 450 487
3	Reversible ratchet 0 496 855
4	Commercially available reduction
5	adapter 2 469 138

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Assemble all special tools and commercially available tools as shown.

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To tighten the VANOS central valve (1) use the reversible ratchet (2) from the special tool 0 496 855 with the special tool 2 450 487.

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Use special tool 0 496 855 to tighten the VANOS central valve (1).

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Tighten the VANOS central valve of the intake adjuster (1) with special tool 0 496 855 or 2 450 487

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TIGHTENING TORQUES SPECIFICATION

VANOS central valve to camshaft
M12x1	1. Tightening torque 2. Tightening torque 3. Angle of rotation	30 Nm 50 Nm 65°


M21 VANOS central valve on the thread and on the contact surface must be coated with engine oil.	1. Tightening torque 2. Tightening torque	50 Nm 140 Nm

M22 VANOS central valve on the thread and on the contact surface must be coated with engine oil.	1. Tightening torque 2. Tightening torque	50 Nm 140 Nm

Tighten the VANOS central valve of the exhaust camshaft adjuster (1) with special tool 0 496 855 or 2 450 487.

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TIGHTENING TORQUES SPECIFICATION

VANOS central valve to camshaft
M12x1	1. Tightening torque 2. Tightening torque 3. Angle of rotation	30 Nm 50 Nm 65°


M21 VANOS central valve on the thread and on the contact surface must be coated with engine oil.	1. Tightening torque 2. Tightening torque	50 Nm 140 Nm

M22 VANOS central valve on the thread and on the contact surface must be coated with engine oil.	1. Tightening torque 2. Tightening torque	50 Nm 140 Nm

Remove special tools 2 288 380 and 2 358122.

Follow-up Work

Refer to DISASSEMBLING ALL SPECIAL TOOLS
Refer to CHECKING CAMSHAFT TIMING .