We carry out the work on a cold engine.
Use spark plugs recommended by the manufacturer: CHAMPION RN9YC, NGK BPR6ES or equivalents from other manufacturers.
To replace the spark plug…
…we remove the high-voltage wire tip from the spark plug.
Using a high 21 mm socket with an extension or a spark plug wrench, unscrew the spark plug…
…and we take it out.
We check the gap between the spark plug electrodes with a round feeler gauge.
If the gap does not correspond to the norm (0.7–0.8 mm), carefully bend the side electrode, achieving the required gap.
When screwing in the spark plug, it is necessary to turn the extension with a head or spark plug wrench by hand, and not with a ratchet or a handle, to avoid damaging the threads of the spark plug hole in the cylinder head.
If the spark plug is not threaded, you will feel a strong resistance to rotation. In this case, you need to completely unscrew the spark plug and, after cleaning the thread, screw it in again.
Finally tighten the spark plug to a torque of 25 Nm.
We check (replace) the remaining spark plugs in the same way.
Overtightening the spark plugs can damage the threads in the spark plug holes in the cylinder head.
The article is reprinted from the website ChevyMan.ru