Replace the spark plugs of cylinder bank 1
Preliminary work
- Refer to DISCONNECTING ALL BATTERY GROUND LEADS .
- Refer to REMOVING THE COVER PANEL OF THE MASTER DME CONTROL UNIT .
- Refer to REMOVING THE COVER PANEL OF THE SLAVE DME CONTROL DEVICE .
- Refer to REMOVING THE ACOUSTIC COVER .
- Refer to REMOVING HOLDER OF DME CONTROL UNIT FOR CYLINDERS 5 TO 8 .
- Refer to REMOVING THE CONTROL UNIT BRACKET FOR CYLINDERS 1 TO 4 .
- Refer to PARTIALLY REMOVING THE COOLANT EXPANSION TANK .
- Refer to REMOVING THE WIRING HARNESS FROM THE CYLINDER BANK 2 .
Removing ignition coil of cylinder bank 1
NOTE:
RISK OF DAMAGE
Damage to the ignition coil .
The silicone hose of the ignition coil must not be contaminated by fuel as this can lead to failure of the ignition coil .
Damage to the ignition coil .
The silicone hose of the ignition coil must not be contaminated by fuel as this can lead to failure of the ignition coil .
- When working on the fuel system, cover the ignition coils with suitable materials and remove where required.
- Do not oil or grease the silicone tube of the spark plug socket. Do not use any protection or maintenance products (e.g. silicone spray, rubber care products, rust remover, etc.).
NOTE:
The description is provided only at one component. The procedure is the same for all other components.
- Unlock the connector fastener (2) of the ignition coil and disconnect the connector (1).
If necessary, the cable conduit on the heat shield must be pushed upwards slightly.
- Ensure that no cables are crushed or damaged.
- Repair damaged cables.
- Slowly pull the ignition coil (3) up and take out without jerking it.
Pulling out the ignition coil (3) with jerks may cause the silicone hose to tear.
- After removing the ignition coils: Fuse off the silicone hose (1) of the ignition coils with an air gun (2).
The ignition coils must be free of oil and fuel residue.
Removing spark plugs of cylinder bank 1
WARNING:
Hot surfaces
.
Risk of burning!
Risk of burning!
- Perform all work only on components that have cooled down.
CAUTION:
Swirling dirt particles caused by compressed air
.
Injury hazard!
Injury hazard!
- Collect dirt particles, e.g. when blowing out, use cloth to do so.
- Wear safety goggles.
NOTE:
TECHNICAL INFORMATION
Clean spark plug slot with compressed air .
The spark plug shaft must be cleaned using compressed air after having removed the ignition coils and before removing the spark plugs. After having removed the spark plugs, once again check the sealing surface for contamination and (if necessary) clean using a moist cloth or clean using compressed air.
Deposits that are not removed according to instructions may enter the combustion chamber and lead to uncontrolled combustion. Remaining deposits on the spark plug sealing surfaces may lead to leaks and the spark plugs may come loose during engine operation.
Spark plug threads must not be greased or oiled. Insufficiently tightened spark plugs may cause leaks and the sparks plugs may come loose during engine operation.
Clean spark plug slot with compressed air .
The spark plug shaft must be cleaned using compressed air after having removed the ignition coils and before removing the spark plugs. After having removed the spark plugs, once again check the sealing surface for contamination and (if necessary) clean using a moist cloth or clean using compressed air.
Deposits that are not removed according to instructions may enter the combustion chamber and lead to uncontrolled combustion. Remaining deposits on the spark plug sealing surfaces may lead to leaks and the spark plugs may come loose during engine operation.
Spark plug threads must not be greased or oiled. Insufficiently tightened spark plugs may cause leaks and the sparks plugs may come loose during engine operation.
NOTE:
The description is provided only at one component. The procedure is the same for all other components.
- Unscrew the spark plugs with the special tool 0 495 560 (12 1 220)
and an extension with joint
.
Flexible ratchet extensions must always be used. If rigid mounting tools are used, there is a risk of insulator breakages.
Also, do not use a variable plug connection with locking capability as this poses a risk of insulator breakages.
- Unscrew the spark plugs with the special tool 0 495 560 (12 1 220) and an extension with joint .
Installing spark plugs of cylinder bank 1
NOTE:
The description is provided only at one component. The procedure is the same for all other components.
- Insert spark plug (1) into special tool 0 496 065 (12 1 230) .
NOTE:
TECHNICAL INFORMATION
Do not drop spark plug into spark plug shaft! This can lead to a reduction of the electrode gap and can thus impair smooth running of the engine, especially in idle position.
Do not drop spark plug into spark plug shaft! This can lead to a reduction of the electrode gap and can thus impair smooth running of the engine, especially in idle position.
- Make sure the spark plug does not fall into the spark plug shaft.
- First screw spark plugs into the engine using special tool 0 496 065 (12 1 230) and tighten manually.
NOTE:
TECHNICAL INFORMATION
Exclusively swiveling extensions may be used for the reversible ratchet. Rigid mounting tool and variable plug connections with rigid option may not be used; there is a risk that the insulator breaks.
Exclusively swiveling extensions may be used for the reversible ratchet. Rigid mounting tool and variable plug connections with rigid option may not be used; there is a risk that the insulator breaks.
- Tighten spark plugs with a torque wrench, special tool 0 496 065 (12 1 230) and extension with joint.
TIGHTENING TORQUES SPECIFICATION
| Spark plugs | ||
| M12x1.25 | Tightening torque | 23 Nm |
Install ignition coils of cylinder bank 1
NOTE:
RISK OF DAMAGE
Damage to the ignition coil .
The silicone hose of the ignition coil must not be contaminated by fuel as this can lead to failure of the ignition coil .
Damage to the ignition coil .
The silicone hose of the ignition coil must not be contaminated by fuel as this can lead to failure of the ignition coil .
- When working on the fuel system, cover the ignition coils with suitable materials and remove where required.
- Do not oil or grease the silicone tube of the spark plug socket. Do not use any protection or maintenance products (e.g. silicone spray, rubber care products, rust remover, etc.).
NOTE:
The description is provided only at one component. The procedure is the same for all other components.
- Before installing the ignition coils: Fuse the spark plug shafts (2) out with an air gun (1).
- Check the anti-twist lock (1).
The rubber seal of the ignition coil must completely enclose the opening for the spark plug on the cylinder head cover.
- Position the ignition coil and gently push it to the stop, if necessary by twisting it back and forth slightly.
If necessary, the cable conduit on the heat shield must be pushed upwards slightly.
- Push connector (1) onto the ignition coil with the connector fastener (2) open.
- Carefully close the connector fastener (2).
On closing locking lever, the connector (1) must lie on counter piece almost gap-free. In the process, the crank webs of the locking lever are positioned inside the counter piece.
- Ensure that no cables are crushed or damaged.
The connector fastener must snap into place without great effort.
- Repair damaged cables.