Note: Manufacturers do not specify an exact interval for replacing spark plugs, but only recommend inspecting them regularly. Experience shows that it is better to replace the spark plugs during inspection, even if they still appear to be in good condition.
1. To replace spark plugs, you need a special socket that fits the size of a ratchet wrench. This socket will protect the porcelain spark plug insulator and hold the spark plug in place while it is installed into the cylinder bore. You will also need a special feeler gauge to check and adjust the spark plug gap (photo).
Tools needed to replace the spark plug:
- 1. Nest
- 2. Torque wrench
- 3. Ratchet wrench
- 4. Extension
- 5. Spark plug gap feeler gauge
2. The spark plugs are located on the front side of the engine.
3. It is best to buy new spark plugs in advance, adjust their gap, and then replace the spark plugs one by one.
4. The operation and efficiency of the engine depend on the functioning of the spark plugs. It is essential that the spark plugs installed are suitable for the engine (the correct spark plug brand is indicated at the beginning of this Section). Cleaning spark plugs is rarely necessary and should not be attempted unless you have the proper equipment, as the electrodes can easily be damaged.
5. Allow the engine to cool completely before removing the spark plug. At this time, inspect each of the new spark plugs for defects and check their gaps.
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6. To check the gap, insert the feeler gauge lead between the electrodes at the tip of the spark plug. The interelectrode gap is specified in the Specifications. The wire should only touch each of the electrodes. If the gap is incorrect, use the adjuster on the probe body to slightly bend the curved side electrode to achieve the correct gap. If the side electrode is offset from the center electrode, use the adjuster to align them. Check the porcelain insulator for cracks, which would indicate the spark plug should not be used.
7. Remove the wire from one of the spark plugs (the engine has cooled down), by grabbing the tip of the wire, not the wire itself. Sometimes it is necessary to turn the tip a few times to release it.
8. Use compressed air to remove all dirt from the spark plug and its mounting area (you can use a regular bicycle pump). This is necessary to remove any dirt that may get into the cylinder after removing the spark plug.
9. Place the socket on the spark plug and remove the spark plug from the engine by turning it counterclockwise.
10. Inspect the spark plug and assess its condition.
11. Screw the spark plug into the cylinder by hand, then tighten it with a torque wrench. Where it is difficult to insert the spark plug into the cylinder bore, place a short piece of rubber tubing over the end of the spark plug. The flexible tube will act as a universal joint, which will help align the spark plug with the hole, and if the spark plug threads are crooked, the tube will be easy to slide over the spark plug to prevent damage to the threads. The correct tightening torque is given in the Specifications. If a torque wrench is not available, tighten the plug no more than a quarter turn from the point where the washer contacts the sealing surface.
12. Before installing the spark plug wire onto its end, inspect it as described in Chapter 36.
13. Install the wire onto the new spark plug. Make sure the wire is routed away from the exhaust manifold.
14. Perform the same procedure on the remaining spark plugs, replacing them one at a time to avoid mixing up the wires.