NGK CR7HSA-9 5147 Spark Plug Silver

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 . Specifications: - Standard spark plug - Key width: 16 mm - External thread: 10mm - Thread length: 12.7 mm - Spark position: 1.65 mm - M4 connection version - Nickel central electrode - ground electrode - Interference suppression, 5 kOhm