How do you use a spark plug gapper?

1. What is a spark plug gapper?
2. How do you close a spark plug gap?
3. Are Autolite spark plugs pre-gapped?
4. What happens if the spark plug gap is too small?
5. How tight should spark plugs be?
6. What happens if spark plug gap is too large?
7. What do the numbers on a feeler gauge mean?
8. What is 1 mm on a feeler gauge?
9. How do you gap a spark plug without a tool?
10. Is Autolite spark plugs good?
11. What is the gap on an Autolite 3924 spark plug?

What is a spark plug gapper?

Save time and precisely gap your spark plugs with our new billet spark plug gapping tool. To use, simply place spark plug as shown in the picture and insert desired feeler gauge between ground strap and electrode. ... Then turn knob counterclockwise to create space between tool and feeler gauge and remove spark plug.

How do you close a spark plug gap?

If it is necessary to widen the gap, do so with a tool that only pulls back on the ground electrode without touching the center electrode or the porcelain. To close the gap on a plug, gently tap the plug, electrode first on a hard surface.

Are Autolite spark plugs pre-gapped?

Autolite® and all spark plug manufacturers offer spark plugs pre-gapped in the most popular gap sizes. Because of the many gap sizes required, no one offers spark plugs properly gapped for every application. Gapping has always been the job of the installer.

What happens if the spark plug gap is too small?

The Spark-Plug Gap

One of the key factors that makes a spark plug work well, or not, is the size of the gap between the electrodes. If the gap is too small, the spark will likely be too weak and cause the engine to run poorly or with poor efficiency.

How tight should spark plugs be?

Confirm that the thread reach of the spark plug is the right one for your engine. ... Tighten the spark plug finger-tight until the gasket reaches the cylinder head, then tighten about ½ – ⅔ turn more with a spark plug wrench. (Taper seat: About 1/16 turn more.)

What happens if spark plug gap is too large?

Excessive spark plug gap results when the voltage has too far to travel. ... Excessive plug gap also results in cylinder misfiring, a possible no-start condition, wet, black or fouled plugs, engine hesitation and rough idle. Excessive spark plug gap also happens as result of normal electrode wear and age.

What do the numbers on a feeler gauge mean?

Specifications for Feeler Gauges

The number of blades or leaves – Different feeler gauge sets will feature different numbers of blades. On the low side, 10 or less, with 13, 15, 25, 26, 31 being more common blade counts, all the way up to over 100.

What is 1 mm on a feeler gauge?

A feeler gauge is used to measure or set very small gaps, normally under 1 mm. When the blades are folded back into the handle, the thin, delicate blade are protected. The thickest possible blade that can be inserted into a gap or crack shows its width. Note: normally the blades are not hardened.

How do you gap a spark plug without a tool?

All you need to do is slide the spark plug electrode opening into the gap opener and gently move it over to the smallest side of the gapper. Once it hits the 0.02” area, press the electrode down until it's flush on each end of the gapper.

Is Autolite spark plugs good?

5.0 out of 5 stars Perfect for those looking to choose a spark plug that ... Perfect for those looking to choose a spark plug that has better durability* and a more focused ignition for better overall ignitability** and optimum performance.

What is the gap on an Autolite 3924 spark plug?

The factory gap is . 054. If the ignition is stock and the compression ratio is under 10:1 that setting will work.