NGK GR8DI-8 94975 Spark Plug

In modern engines, cylinder heads are usually made of aluminium, and with heat this material expands more than spark plugs, so its thread seizes . Therefore, when changing the spark plugs, the engine must be completely cold . Features: - Loosen the spark plug that is mounted. - Before removing it, remove deposits and dirt from the mounting hole with the help of a brush or, if you have the means, by applying pressurized air. - Unscrew the old spark plug. - Remove coarse dirt from the spark plug hole area. - Hand thread the spark plug until it stops. - Never use spark plugs that have been dropped on a hard surface without being packaged. - Correctly position the indicated wrench on the spark plug nut and tighten moderately .