- 16mm spark plug wrench, for example HAZET900AKF.
Materials required:
- 4 or 6 spark plugs of the appropriate specification.
1. Unscrew the spark plugs with a spark plug wrench and check the condition of the spark plugs.
2. Inspect the removed spark plug. If the spark plug is covered in oil or wet, then there is a misfire or the piston rings are in poor condition (check the compression by contacting a workshop).
3. Check the spark plug insulators for traces of surface leakage currents. These are detected by thin, uneven marks on the surface of the insulator. If such marks are present, check the tightness of the high-voltage wire tip on the spark plug. Replace the tip if necessary.
4. Clean the spark plugs with a brass brush or sandblaster if necessary.
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5. Measure the gap 2 between the electrodes using a special feeler gauge (see illustration). The nominal value of the gap is 0.9-1.1 mm.
Attention! The gap between the electrodes of new spark plugs is usually set correctly at the manufacturer and complies with the standard.
6. Replace spark plugs with burnt electrodes with new ones.
7. Bend the side electrode 1 to adjust the gap. Bend by tapping on the side electrode. To bend the side electrode, use device 3 or a small screwdriver, resting it on the edge of the thread, but in no case on the central electrode, otherwise it may be damaged (see illustration 14.5).
Installation
8. Clean the spark plug threads with a clean rag.
9. Screw in the spark plugs by hand until they touch the cylinder head.
10. Tighten the spark plugs with a spark plug wrench.
Caution! Spark plugs that are too tight may break when unscrewed or the threads of the spark plug hole on the cylinder head may be damaged. If the threads are damaged, use a UTC or Heli-Coil repair kit.
11. Place the high-tension wire tips on the spark plugs, following the numbering.
Attention! On four-cylinder engines, the cylinders are counted from front to back; on V6 engines, the first cylinder is located at the front right, 2 and 3 at the back, 4 at the front left, and the rest are behind the 4th cylinder.
Checking electrical connections
12. Check all electrical connections to the ignition unit for tightness.
13. Replace loose or broken plugs.
14. Check the spark plug wires by bending them and checking for cracks. Replace the wires if necessary.
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