I am in the process of installing my Airflow Performance FM-150 fuel servo. Part of the installation requires the stock studs to be swapped out for longer ones. I was able to remove the stock studs without issue but the new ones thread all the way to the hilt (thread less area) with only finger pressure. The Lycoming SP-1776-5-6 manual says the minimum stud driving torque should be 25 in-lbs. I think this is to ensure there is adequate interference to prevent the stud from backing out when trying to remove a nut.
I have the specified sleeve retaining compound and activator ready to go but if I install the new studs with that, the thread lock will be the only thing preventing the stud from spinning out. The stock studs definitely have an interference fit that the new ones do not. As I said, I can thread the new ones all the way in with my fingers while I can?t get a complete turn on the stock studs. I?ve called around to several auto parts places but none of them seem to know anything about studs with tighter (oversized?) threads.
Have any of you run into similar issues? I?m not sure how to proceed at this point.
I have the specified sleeve retaining compound and activator ready to go but if I install the new studs with that, the thread lock will be the only thing preventing the stud from spinning out. The stock studs definitely have an interference fit that the new ones do not. As I said, I can thread the new ones all the way in with my fingers while I can?t get a complete turn on the stock studs. I?ve called around to several auto parts places but none of them seem to know anything about studs with tighter (oversized?) threads.
Have any of you run into similar issues? I?m not sure how to proceed at this point.