Jerry’s comment about temperature differences is valid. Plastic has a large coefficient of expansion and the wheel could shrink enough to make it lose the magnetic connection when the engine is cold. Magnetism drops off real quickly with distance. I doubt that any underhood temperature is high enough to kill the magnetism. I too killed a magnet trying to weld up a tool.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.