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The older cases do not have through bolts. The studs on #3 are (if I recall correctly) through studs and go from the cylinder base into the opposite case half to provide the clamping force on the main bearing. Be glad this is not the one that broke. Nothing good can come of it. The stud on the #2 side should be the same as the other 7/16 studs on that side, part number 25331. Later cases (after the introduction of the O200) have through bolts in this position and are a lot stronger in the area of the center main bearing web. The early style often cracks around the stud where it screws into the case in the event of a prop strike with a metal prop. Late style cases that take early conical mounts are rare and quite desireable. there is no approved way to convert an old style to use the through studs because of an oil passage in close proximity. Try and figure out why the stud broke.... John ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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