Quote:
Originally Posted by glenmore
My 2000 C280, 60m, is probably overdue for a plug change. Is this procedure pretty routine save for the cost of 12 plugs? Also I been reading that there is a potential of frozen plugs with this engine and that anti-seize is recommended with a change. Is it ever appropriate to spray a penetrating fluid like WD40 or Liquid Wrench down in the spark plug bore before trying to break them loose?
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I have had problems in the past with spark plugs seized in the aluminum heads of vw's. I found that squirting some 'tap magic' tapping fluid around the plug will prevent the galling that strips out the threads. If the plug turns hard after it is broken loose, just squirt some tap magic and work the plug. Sometimes you can only turn the plug a fraction of a turn but keep working it back and forth and the fluid penetrates and then the plug will come out cleanly. I have yet to have this method fail me. Penetrating oil may also work but I will continue to use what I know from experience will work.
I chase the threads before installing plugs if they did not remove easily and I use anti-sieze on the threads.