Volvo 2002 s60. Changing spark plugs. All was going well till I got to the last one. Only was able to budge it a little. Used strong pressure with socket wrench but was afraid to break it. Any suggestions to remove it. Would trying it with the engine hot help?

 

spray some PB Blaster down the hole and wait a bit (say 30 minutes to an hour) before trying again

 

Yes be patient - if the plug has loosened a few degrees, spray penetrant into the hole - wait, tighten, loosen, wait, tighten, loosen - and so on, With lots of patience and penetrant - it will slowly be able to turn a few more degrees, then a 1/4 turn then 1/2 turn ... - don't use too much force - you could damage the head - that is not a terrible fate, but one you want to avoid.

A hot engine might help - aluminum expands more than steel so it might come out easier - but it is always recommended to install plugs in a cold engine, with a aluminum head and a steel plug. Sometimes plugs are hard to get out because there is carbon built up in the threads - this can come from a loose plug allowing gasses past the sealing ring.

 

Thank you for the quick response. I will try that.