Spark Plug – inspection and replacement

Spark-Plug – inspection-and-replacement

Every internal combustion engine is driven by the power of the burning fuel inside the engine.

Therefore the engine itself must contain fuel (gasoline, oil or other fuel), air and spark – that will ignite the fuel. The role of the spark plug as a component of the engine in this process is to set off the compressed air-fuel mixture to flame.

The spark plug as a device directs the electrical current from the ignition system, and through the centre electrode it allows the electrical current to complete the circuit with the ground electrode as a finishing point, by creating a spark in the air gap of the spark plug. So the function of the spark plug is to transmit the electrical current so that it ignites the air compressed fuel while containing combustion pressure within the engine.

Like every other part of the vehicle the spark plugs requires regular checks and occasional replacements (at approximately 30 000 miles). Before replacing them the spark plugs need to be carefully inspected and special attention should be paid to these several things: is the electrode spent, is the electrode insulator damaged and to replace the plugs according to the recommendations of the manufacturer.

Firstly, we will show you how to properly make inspection of the spark plugs. Before you even start, you need to check what the recommended distance for inspecting the spark plugs is. Usually it is 30 000 miles. The first step is to disconnect the wires from the spark plugs. After that, you need to check if there is water or debris above them, because when the spark plugs are removed all the dirt or the drops of water will fall right on to the cylinders. Once you are assured that the area is clean you may proceed. For removing the spark plugs you can use many tools, such as the magnetic sockets or the socket wrench. When the plug is removed – carefully inspect it and closely look for the next several things.

-The electrode – check if the electrode is spent or worn out, the best indicator for that is if it has rounded shape instead of being flat.

-The plug gap – firstly you need to check what is the recommended width of the gap, and then with a simple spark plug tool measure the gap (in the example the gap is 1,1 mm).

-The spark plug tip – make sure that the spark plug tip is clean, meaning there are no oil fouling or carbon deposits around it.

-The plug gasket – inspect the plug gasket where the plug seals with the head.

-The electrode insulator – assure that the insulator is not cracked or damaged in any way.

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