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Faunsdale, AL | When used in the most demanding application I know (crankshaft bearing fasteners ), they are supposed to be installed so the legs are bent up and down as you are looking down at end of fastener. The upper leg bends back across the end of the fastener and the other one bends down against the side of the nut.
However the cotter pins that come in engine kits are sometimes different from the usual ones you see. The have a "double head" arrangement so there is a second bulge just below the round head. I guess this is so the head sticks out past the flat of the castellated nut so you can grab it with pliers to get it out. A retired mechanic that posts online also recommended that the nut be turned slightly to bind the cotter pin so it cannot shake around and break. Not too bad to do on a small engine, but nearly impossible on some of the big ones. | |
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Correct cotter pin bending?
