They are made in Mexico and have had problems with the shell breaking off in cylinder heads.Happened to me on an Olds V8.Most of the threaded part stayed in the head.It came out easy and showed most of the break was old.Had to be overtightened.Ive had some hard removals but never had a Champion plug break off before that one.I have plans to tap some some half inch steel 14mm and do a torque wrench test to find the breaking point of old and new Mexico plugs.Too much to do getting ready for winter now.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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