Sparks plugs and/or ignition coils replacement

ID: 152633

Description: Applicable to H4D and H4Bt engines (M281 E10...

Steps:

1. Open the trunk.
2. Put aside the trunk carpets.

3. Unscrew the 6 T50 screws by hand or using a wrench and a socket.
4. Lift and put aside the engine hood.

5. Disconnect and put aside the oil vapors duct.
6. Disconnect the ignition coils' connector.
7. Unscrew each 8mm bolts of the 3 ignition coils.
8. Gently extract the ignition coils.

9. Unscrew and extract the spark plugs using a 14mm spark plug socket.
10. Clean off and/or dust off the debris in the zone to avoid contamination in the cylinders.
11. The Nickel/Copper spark plug shown aside is around 25.000km aged, using 100% E85.

12. Torque the new spark plug using a 14mm spark plug socket at 24 N.m.
13. Verify and ajust the spark plug gap to the considered model's spec if necessary.
14. The RTA (French Revue Technique Automobile) and spark plug manufacturers advise not to grease the spark plug's thread.
15. Do not modify an used spark plug's gap.

16. Put back the ignition coils on the spark plugs.
17. Torque each of the 3 ignition coils' 8mm bolts at 10 N.m.
18. Reconnect the ignition coil's connectors.