Adjusting the timing of the camshafts
WARNING:
High-voltage system.
The high-voltage system operates on the basis of hazardous, electrical voltage and high currents. Mortal hazard through electric shock!
The high-voltage system operates on the basis of hazardous, electrical voltage and high currents. Mortal hazard 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:
- For additional information see:
NOTE:
RISK OF DAMAGE
Damage to the engine.
If the engine is manually rotated in the wrong direction of rotation, the engine can be damaged.
Damage to the engine.
If the engine is manually rotated in the wrong direction of rotation, the engine can be damaged.
- Only rotate the engine manually in the correct direction of rotation: a) clockwise when looking at the damper, or b) counterclockwise when looking at the chain drive, b) applies only if the timing chain is installed in the rear.
Preliminary work
- Refer to REMOVING CHAIN TENSIONER .
NOTE:
TECHNICAL INFORMATION
Assemble the tools for releasing and tightening of the VANOS central valves according to their accessibility.
Assemble the tools for releasing and tightening of the VANOS central valves according to their accessibility.
Install a new chain tensioner
- Replace sealing ring (1)
.
Parts : Sealing ring
- Tighten chain tensioner using the illustrated tool.
- Tighten chain tensioner (1)
from below.TIGHTENING TORQUE SPECIFICATIONS
Chain tensioner to cylinder head Chain tensioner piston M22x1.5 Joining torque 20 Nm Angle of rotation 30° - Keep set of special tools 2 358 122
at hand:
Number Description 1 Basic carrier 2 Screws (basic carrier to cylinder head) 3 Gauge to fix exhaust camshaft 4 Gauge to fix intake camshaft 5 Screws (gauge to basic carrier) - Have the special tool 2 469 138
ready.
- Prepare all special tools and commercially available tools.
Number Description 1 Standard torque wrench 2 Wrench socket set 2 450 487 3 Reversible ratchet 0 496 855 4 Commercially available reduction 5 adapted 469 138 - Assemble all the special tools and commercially available tools as shown.
- In order to release the VANOS central valve (1)
, use the reversible ratchet (2) from the special tool 0 496 855with the special tool 2 450 487
.
- To release the VANOS central valve (1)
use the special tool 0 496 855
.
- Mount the 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 to a position so that the marks (1) on the exhaust and intake camshafts can be read from above.
- Block the crankshaft with the special tool 2 288 380
in the TDC firing position of cylinder (1)
.
Check
- Check whether the center of the three flattened areas (1)
on both camshafts points upwards. The special tool 2 358 122
can also be mounted when the camshafts are twisted by 180° (central flattened area points downwards).
Result
» The center of the three flattened areas (1) does not point upwards.
Measure
- Turn the camshafts to the correct position so that the center of the three flattened areas (1) on both camshafts points upwards.
- Secure the basic carrier (1) of the special tool 2 358 122 with the screws (2) 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)
.
- Have the special tool 2 469 138
ready.
- 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 adapted 469 138 - Assemble all special tools and commercially available tools as shown.
- In order 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
.
- Use special tool 0 496 855
to tighten the VANOS central valve (1)
.
- Tighten the VANOS central valve of the intake adjuster (1)
with special tool 0 496 855
or 2 450 487
.TIGHTENING TORQUE SPECIFICATIONS
VANOS central valve to camshaft M12x 1 1. Tightening torque 30 Nm 2. Tightening torque 50 Nm 3. Angle of rotation 65° M21
VANOS central valve on the thread and on the contact surface must be coated with engine oil.1. Tightening torque 50 Nm 2. Tightening torque 115 Nm M22
VANOS central valve on the thread and on the contact surface must be coated with engine oil.1. Tightening torque 50 Nm 2. Tightening torque 140 Nm - Tighten the VANOS central valve of the exhaust camshaft adjuster (1) with special tool 0 496 855
or 2 450 487
.TIGHTENING TORQUE SPECIFICATIONS
VANOS central valve to camshaft M12x 1 1. Tightening torque 30 Nm 2. Tightening torque 50 Nm 3. Angle of rotation 65° M21
VANOS central valve on the thread and on the contact surface must be coated with engine oil.1. Tightening torque 50 Nm 2. Tightening torque 115 Nm M22
VANOS central valve on the thread and on the contact surface must be coated with engine oil.1. Tightening torque 50 Nm 2. Tightening torque 140 Nm - Remove special tools 2 288 380 and 2 358 122 .
Follow-up work
- Refer to DISASSEMBLING ALL SPECIAL TOOLS .
- Refer to CHECKING CAMSHAFT TIMING .