11-03-2021, 10:12 AM
I find helicoils quick,cheap and easy to install on stripped out threads,Even Rolls Royce used to fit them on their older aero engines.
Had to repair the threads on a couple of Mag crankcases,The starter mounts 5/16 BSF standard,both had been tapped out to 3/8" BSF and as Charles says there's not a lot of metal there and opening out bigger I thought would needlessly weaken the area around the top of the bell housing plus the shock when engaging the bacon slicer starter.So I attempted to make some 3/8 to 5/16 bsf reducers ,took 3 attempts,the firsts turning into spirals either in the making or in the inserting,but did it in the end.
Had to repair the threads on a couple of Mag crankcases,The starter mounts 5/16 BSF standard,both had been tapped out to 3/8" BSF and as Charles says there's not a lot of metal there and opening out bigger I thought would needlessly weaken the area around the top of the bell housing plus the shock when engaging the bacon slicer starter.So I attempted to make some 3/8 to 5/16 bsf reducers ,took 3 attempts,the firsts turning into spirals either in the making or in the inserting,but did it in the end.