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How to gap spark plugs with a feeler gauge
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Shop for Feeler Gauges |
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![Using feeler gauge to check Spark Plug gap Gapping Spark Plugs with a Feeler Gauge](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==) |
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Step 1 – Check gap meets spec
Use your feeler gauge to check the spark plug gap meets the specification for your vehicle.
You may need to adjust the spark plug gap from its out-of-the-box state. |
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![Centre and ground electrode Use feeler gauge to check gap between spark plug centre electrode and ground electrode](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==) |
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Step 2 – Bend ground electrode
To alter the gap, bend the ground electrode slightly away from or toward the centre electrode. |
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![Adjusting the spark plug gap Using pliers to adjust spark plug gap after checking with feeler gauges](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==) |
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Step 3 – Use other tools if necessary
Spark plug gapping tools are available, however, sometimes a small mallet, wrench, or pliers can be used to adjust the gap slightly. |
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![Rechecking spark plug gap with feeler gauge After adjustment. recheck spark plug gap with feeler gauge](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==) |
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Step 4 – Place gauge between electrodes
Re-check the gap by placing the feeler gauge between the two electrodes.
The gap must meet the vehicles specification so the spark plug can fire efficiently. |
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![Gapping a spark plug with a feeler gauge Gapping spark plugs with a feeler gauges](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==) |
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Spark plugs in automobiles generally have a gap between 0.9-1.8 mm (0.035″–0.070″). |
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