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A few days ago I had to replace the spark plugs in my V70 (Alum head). They had been in there for several years and 85,000 miles. Most of them backed out fairly effortlessly, however one in particular did not want to unscrew without a battle. I unscrewed it about a half turn at which point it became VERY TIGHT and I started to worry. I screwed it back in a bit, then unscrewed to where it got tight again, screwed it back in, then back out, etc. Each time I unscrewed it I went a little bit further until it had lifted enough to spray some lubricant down under the washer, hoping it would soak down into the threads. Screw in - screw out - screw in - screw out. Man, was my arm getting tired! I used a medium length ratchet so as to not apply too much torque. Eventually I got it out with no thread damage and without snapping the spark plug in half.
About half way through the process I started thinking what would have happened if I had taken it to the wrong repair shop and some knuckle head tried backing it out with an impact gun?
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Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)
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