Replace spark plugs
Preliminary work
- Refer to REMOVING THE ACOUSTIC COVER .
- Refer to REMOVING INTAKE SILENCER HOUSING .
- Refer to REMOVE IGNITION COILS .
Remove spark plugs
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:
TECHNICAL INFORMATION
In order to avoid an uncontrolled flashover of ignition sparks, special attention must be paid to the cleanliness of the insulator (ceramic) of the spark plugs.
Do not tap the insulator of the spark plugs with your fingers or label it and make sure it does not come into contact with liquid media, such as fuel or oil.
Always handle spark plugs at the spark plug thread. Guiding in the spark plugs using a clean hose (installation aid 12 1 230) is permitted.
In order to avoid an uncontrolled flashover of ignition sparks, special attention must be paid to the cleanliness of the insulator (ceramic) of the spark plugs.
Do not tap the insulator of the spark plugs with your fingers or label it and make sure it does not come into contact with liquid media, such as fuel or oil.
Always handle spark plugs at the spark plug thread. Guiding in the spark plugs using a clean hose (installation aid 12 1 230) is permitted.
NOTE:
The description is for one component only. The procedure is identical for all further components.
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.
- Connect special tool 0 495 560 (12 1 220)
on an extension with joint and a reversible ratchet.
- Unscrew spark plugs with special tool 0 495 560 (12 1 220) and an extension.
Install spark plugs
NOTE:
TECHNICAL INFORMATION
In order to avoid an uncontrolled flashover of ignition sparks, special attention must be paid to the cleanliness of the insulator (ceramic) of the spark plugs.
Do not tap the insulator of the spark plugs with your fingers or label it and make sure it does not come into contact with liquid media, such as fuel or oil.
Always handle spark plugs at the spark plug thread. Guiding in the spark plugs using a clean hose (installation aid 12 1 230) is permitted.
In order to avoid an uncontrolled flashover of ignition sparks, special attention must be paid to the cleanliness of the insulator (ceramic) of the spark plugs.
Do not tap the insulator of the spark plugs with your fingers or label it and make sure it does not come into contact with liquid media, such as fuel or oil.
Always handle spark plugs at the spark plug thread. Guiding in the spark plugs using a clean hose (installation aid 12 1 230) is permitted.
NOTE:
The description is for one component only. The procedure is identical for all further components.
- Insert spark plug (1) into the 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.
- First screw in spark plug using special tool 0 496 065 (12 1 230) into the engine 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 plug with torque wrench, special tool 0 495 560 (12 1 220) and extension with joint.
Follow-up work
- Refer to INSTALLING THE IGNITION COILS .
- Refer to INSTALLING INTAKE FILTER HOUSING .
- Refer to INSTALLING ACOUSTIC COVER .