Removing Spark Plugs: You'll need to use a spark plug

wrench. Apply firm, steady pressure on the wrench until it starts to

budge. Then, after each full turn of the wrench, actually screw the

plug back in, just a touch, to loosen any debris that may be caught on

the threads.

If You Can't Loosen the Plug: Try running the engine until

it's warm, as this tends to expand the plug hole. Turn off the engine

and try removing the plug. Or, you might want to try spraying

penetrating oil at the base of the plug. However, make sure the

engine is cold before spraying the oil. Allow the oil to soak in for a

while to lubricate the threads before putting the wrench on the plug.

After removing the old plug, have a look to make sure that

the threads in the engine are not damaged. For repairing minor

thread damage, you can try using a thread chaser. But, make sure

you follow the manufacturer's directions carefully.

Installing the New Plug: Start the new plug off by hand to

make sure you don't thread it in crooked. And be sure you

don't over-tighten the plug. Gasket-seat plugs shouldn't be screwed

in more than 1/12th turn past where they contact the engine and

tapered-seat plugs shouldn't be more than 1/16th of a turn.

If done properly, replacing your spark plugs won't be a

difficult or time-consuming task. And, getting into the habit of

replacing them regularly may help you avoid significant engine

damage in the future.

Leaving your spark plugs in too long can cause lost fuel

mileage, rough operation and engine damage.

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