I have recently replaced a Nissan Pathfinder 2006 engine with the new good one used the engine. After three months now I am going to replace the spark plug.
I have successfully replaced the 5 spark plug but when I have tried to no 3 plugs and I have inserted the plug tool in the slot but the tool not going up to the plug. Then I have noticed that there is a metal sleeve in the slot.
Can anybody assist me what is the purpose of this metal sleeve in the spark plug slot?
How I can remove that metal sleeve to change the spark plug.
Thanks