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A stripped spark plug aperture in an engine head of soft metal such as magnesium or aluminum is repaired by the use of a slightly externally tapered sleeve having continuous internal and external threads. The sleeve is threaded onto a threaded shank similar in size to the threaded end of the...
wouldn’t you know the threads just blew out in the cylinder head. You remove the bolt and it is coated with aluminum, which means that the threads in the head are stripped, not the bolt. Now you are in for work. Stripped threads are rarely any fun, but ...
In some cases, external removal is as simple as that. Lock on with some pliers and twist off. In other cases, you’ll need to give the stubborn fastener’s threads a good soaking with a penetrating lubricant of some kind, likePB Blaster. For bolts that are too severely rounded or are...
The grit will help fill the worn areas and jam up in the gaps between driver and screw. For stripped screw threads, sometimes you can get a blade or slotted screwdriver under the head of the screw and pry upward while turning the screw head (unscrewing) normally with the popper driver. ...
Spark plugs that haven't been changed for a long time can become one with the cylinder head. Fortunately, it's possible to repair damaged threads instead of scrapping the head.