Quote:
Originally Posted by kannibul
Looking from the threaded end towards the head - in my case, there is a ring around the threaded portion, that has approximately a 1mm gap all the way around - this in turn has a about a 1mm rise, a 1mm width, then a 1mm drop, then the remainder of the bolt head.
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This would be a "Crush Washer". Quit obsessing about this. I've had 57 cars and only replaced crush washers when the parts guy taped one to the filter box (rare). never had a leak.