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How to change spark plugs
1. Locate the spark plug or plugs. They can be found by following the spark plug wire (a larger black or colored wire leading to the cylinder head). If there is more than one plug, make sure you write down or label each spark plug wire before you take it off. This is important, as on an 8 cylinder engine, you can easily forget which wire goes where.
2. Clean around the spark plug before removing it. Any dirt that has built up around the plug will fall into your cylinder when you pull the plug out. Nothing should go into that hole while the plug is out. Make sure everything is clean. Don't leave small parts in a place where they could fall into the cylinder.
3. Put your spark plug socket and ratchet handle over the spark plug and turn it counter-clockwise to loosen. It will be quite tight at first, but should come out easily after that.
4. Take a look at the electrode end of the plug. Check to see if there is a carbon buildup on the electrode, or if the gap is filled with dirt. If it is oily, you may have worn rings. If the plug is tan, the engine is working properly.*
5. Be sure that your replacement plug is the same size as your old plug. The threaded part should be the same length, and the threads should match. If you're unsure what plug to buy, take an old one with you to the store and have the counter person match it for you. Also, they may be able to tell you the correct plug gap for your application.
6. Check the gap of the new plug. It should be within the engine manufacturer's specifications. Plug gauges are available at your local parts counter, usually for a dollar.
7. Insert the plug back into the cylinder head BY HAND at first. Make sure to line up the threads. If you can't get the plug most of the way in by hand, something is wrong. When the threads are lined up, you should be able to get the plug all the way in by hand.
8. Tighten the plug with the socket and ratchet. You want the plug very tight, but not so tight that you break the plug or strip the threads out of the head. There may be a torque specification from the engine manufacturer that you should be sure to tighten the plug to if it is available.
9. Put the plug wires back on the correct plugs. They should snap on and not be easily pulled off. Check to see if they are worn or have cuts in the insulation. If they do, replace them.
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