How To Gap A Spark Plug
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Date: 2020-08-05
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Comments and reviews: 5
Sam
One footnote on gapping spark plugs when you have a spec range - as Mr. O said in the video, the plugs he was working with was. 042 to. 046 thousands - that's the range. With plugs, one is wise to set the gap on the smaller of the range (closer in this case to. 042, the reason being that the plug will stay in spec longer. As spark plugs wear, the gap increases, so a plug gapped to the smaller dimension. 042) will get larger as the plug wears, and will get closer and closer to the. 046 in time. A plug set to the larger side of the gap range will go out of spec sooner as the plug electrodes wear, the side electrode and the center.
One would use the opposite with ignition points on an older traditional non-electronic ignition. For example, if there was a range of. 018 to. 012, you'd normally want to set them to the larger gap of. 018, because points usually get closer together as they wear. The rubbing block that rubs against the cam lobes wears down, and as it does, the point gap decreases. Hence the reason why they give a small amount of light grease to wipe on the lobes - this makes the rubbing surface last longer - therefore keeping the ignition in tune for a longer period of time.
Love your videos, Dr. O! Keep 'em coming!
reply
One footnote on gapping spark plugs when you have a spec range - as Mr. O said in the video, the plugs he was working with was. 042 to. 046 thousands - that's the range. With plugs, one is wise to set the gap on the smaller of the range (closer in this case to. 042, the reason being that the plug will stay in spec longer. As spark plugs wear, the gap increases, so a plug gapped to the smaller dimension. 042) will get larger as the plug wears, and will get closer and closer to the. 046 in time. A plug set to the larger side of the gap range will go out of spec sooner as the plug electrodes wear, the side electrode and the center.
One would use the opposite with ignition points on an older traditional non-electronic ignition. For example, if there was a range of. 018 to. 012, you'd normally want to set them to the larger gap of. 018, because points usually get closer together as they wear. The rubbing block that rubs against the cam lobes wears down, and as it does, the point gap decreases. Hence the reason why they give a small amount of light grease to wipe on the lobes - this makes the rubbing surface last longer - therefore keeping the ignition in tune for a longer period of time.
Love your videos, Dr. O! Keep 'em coming!
reply
David
Incorrect about the round disc and determining the gap. You do not take an average because the electrode covers about 0. 003 or 3 markings as you state. You take the widest marking. That is the marking the leading edge of the electrode first touches and stops. The electrode is not touching the width of 3 marks. It is only touching the first or widest indication marking at the leading edge of the electrode. In the video, that would be 0. 051 before modifying the gap, and 0. 045 after gaping it.
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Incorrect about the round disc and determining the gap. You do not take an average because the electrode covers about 0. 003 or 3 markings as you state. You take the widest marking. That is the marking the leading edge of the electrode first touches and stops. The electrode is not touching the width of 3 marks. It is only touching the first or widest indication marking at the leading edge of the electrode. In the video, that would be 0. 051 before modifying the gap, and 0. 045 after gaping it.
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johnwrench4speed
I just learned that one should not use the ring type plug gap tool on any coated (i. e, platinum, etc) spark plugs because it will take the coating off.
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I just learned that one should not use the ring type plug gap tool on any coated (i. e, platinum, etc) spark plugs because it will take the coating off.
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Handy
Another awesome video. I have one of those coin type tool and had no idea until now that that hole is for expanding the gap. THANK YOU!
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Another awesome video. I have one of those coin type tool and had no idea until now that that hole is for expanding the gap. THANK YOU!
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Dewayne
Since I started as a kid messing with cars I always thought that was 4 the keychain. And they say an old dog cant learn new tricks
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Since I started as a kid messing with cars I always thought that was 4 the keychain. And they say an old dog cant learn new tricks
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