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  2. Thread restorer - Wikipedia

    en.wikipedia.org/wiki/Thread_restorer

    A thread restorer is a tool used to fix threads on nuts or bolts that have become damaged. One type of thread restorer is a thread restoring file or thread file. [1] There are other types of thread restoring tools as well, for example a chaser tap or chaser die. [2] Normal taps and dies can also be used to clean up a thread, which is called ...

  3. Tap and die - Wikipedia

    en.wikipedia.org/wiki/Tap_and_die

    Chasers are made of softer materials and don't cut new threads. However they still fit tighter than actual fasteners, and are fluted like regular taps and dies so debris can escape. Car mechanics, for example, use chasers on spark plug threads, to remove corrosion and carbon build-up.

  4. Spark plug - Wikipedia

    en.wikipedia.org/wiki/Spark_plug

    Spark plug with single side electrode An electric spark on the spark plug. A spark plug (sometimes, in British English, a sparking plug, [1] and, colloquially, a plug) is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within ...

  5. Autolite - Wikipedia

    en.wikipedia.org/wiki/Autolite

    Autolite or Auto–Lite is an American brand of spark plugs and ignition wire sets headquartered in Cleveland, Ohio. Autolite products are sold in the United States, Canada, Mexico, and Australia. Until 2011, the Autolite brand was a part of Honeywell's automotive Consumer Products Group, along with FRAM and Prestone. Since then, it has been ...

  6. Dual ignition - Wikipedia

    en.wikipedia.org/wiki/Dual_ignition

    Although a dual ignition system is a method of achieving optimum combustion and better fuel consumption, it remains rare in cars and motorcycles because of difficulties in siting the second plug within the cylinder head (thus, many dual ignition systems found on production automobiles typically were of a two valve design rather than a four valve).

  7. Pre-ignition - Wikipedia

    en.wikipedia.org/wiki/Pre-ignition

    Carbon deposits form a heat barrier and can be a contributing factor to pre-ignition. Other causes include: An overheated spark plug (too hot a heat range for the application). Glowing carbon deposits on a hot exhaust valve (which may mean the valve is running too hot because of poor seating, a weak valve spring or insufficient valve lash)