CAUTION: Keep hands, clothing and tools away from the radiator fan. On some vehicles, the fans may turn on automatically for up to 15 minutes after the engine is turned off.
1. Number the wires so you don't mix them up when you put them back in place. On most Honda engines, the wires are only long enough to reach the spark plugs; be sure to label them to avoid mistakes.
2. Remove the wire from the spark plug tip by grasping the rubber boot on the wire. If the boot is very tight, you should twist and pull it at the same time. Do not pull the wire directly, as this can damage the internal conductors of the wire. DOHC engines have spark plugs deeply recessed between the shafts. The wires are located in long, solid tubes that are fed through tunnels to the spark plugs; be extremely careful when disconnecting wires and tubes.
3. Use a spark plug wrench to loosen all spark plugs approximately two turns. Depending on the location of the spark plug, a short wrench extension may be helpful. Care must be taken to ensure that the wrench shaft is aligned with the spark plug shaft; if the key is tilted in any direction, the spark plug may break.
The cylinder head is cast from aluminum alloy. Therefore, remove the spark plugs, if possible, when the engine is cold to avoid damaging the threads. If it is difficult to unscrew the plugs, then it is necessary to apply a few drops of penetrating oil to lubricate the threads or apply silicone grease near the base of the plug, giving them a little time to penetrate.
4. If you have compressed air, use it to clean the area around the spark plug sockets. If you don't have it, use a rag and brush. Be very careful not to let any foreign material get into the spark plug sockets.
5. Remove the spark plugs by unscrewing them from the engine. If the spark plugs are accessible, they can be removed manually. On DOHC engines, the spark plugs must be unscrewed and removed using a spark plug wrench.
(The article was taken from the website: «www.hondabook.ru»)