Replacing spark plugs
Correct functioning of spark plugs is one of the most important conditions for efficient engine operation. It is necessary that only the prescribed type of spark plugs are installed on the engine. If the engine is in good condition, cleaning the spark plugs is a rare operation.
Location of identification marks
Location of high voltage wire identification marks (1) and wire removal tool (2).
1. On the DOCH 1.6L engine, remove the oil filler plug, unscrew the screws (indicated by arrows) and remove the cover from the top of the engine. Replace the oil filler plug.
2. On 1.8L and 2.0L engines, remove the screws and remove the spark plug cover from the top of the cylinder head cover.
3. If there are no marks on the high-voltage wires (see Fig. Location of identification marks) it is necessary to mark them in order to avoid mistakes during their further installation.
4. Remove the spark plug wires from the spark plugs by pulling on the spark plug cap.
5. Clean the spark plugs using a brush, vacuum cleaner or compressed air to prevent dirt from getting into the engine cylinders after the spark plugs are removed.
6. Unscrew the spark plugs using a spark plug wrench.
7. Visual inspection of the working part of the spark plugs can show the condition of the engine. If the nose of the spark plug insulator is clean and white, without any deposits, this indicates that the mixture is too lean. This also indicates that the plug is too hot, i.e. the heat from the central electrode is slowly removed. If this is the case, it is necessary to adjust the mixture or replace the plug.
8. If the nose of the spark plug insulator is covered with a black coating, this indicates that the mixture is too rich. If the coating is black and oily, this indicates engine wear and the need for inspection and repair. If the nose of the insulator is covered with a light brown coating, the mixture composition is optimal and the engine is in good condition.
9. The spark plug gap is very important because if the gap is too large or too small, the spark size changes, which leads to a decrease in engine efficiency. The gap must always meet technical requirements.
10. The gap is checked using a wire template (photo on the left) or with a feeler gauge (photo on the right).
11. The gap is adjusted by bending the side electrode (in the photo - a spark plug with several side electrodes). The central electrode should never be bent, as this can lead to breakage of the insulator and failure of the spark plug.
12. To bend the side electrode of the spark plug, you need to use a special tool.
13. Before installing the spark plug into the engine, check that the threads are clean and all threads are intact.
14. To screw the spark plug several turns, you can use a piece of rubber hose, insert the spark plug insulator into one end and, rotating the hose, screw the spark plug several turns. Then you need to remove the hose and screw the spark plug to the required torque.
15. Connect the high-voltage wires to the spark plugs.
Checking the ignition system
1. Check the condition of the high-voltage wires, which should be clean and dry, and should not have any signs of electrical breakdown or oxidation.
2. Check the internal condition of the spark plug tip, which should not show signs of corrosion, which is a hard white powder. Firmly install the spark plug tip onto the spark plug.
3. The spark plugs are replaced as a set.
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