The head bolts on my Boxster 2.5L are being *****es to take off. I know that installation requires a modest torque and then a total of 120deg of rotation. Does anyone have an idea of what the average breaking torque is required?
I've been using a 20" 1/2" drive breaker. I got two bolts to move 30 degrees (the amount I plan to move each bolt per pass in a reverse of installation order). After that I've broken two T-50 bits in a row.
I am considering the impact wrench route. Anyone have any luck with a particular rating on their head bolts? I'd like to go electric rather than pneumatic, but the highest electric torque is about 350ft-lbs and am wondering if that is enough. The bits could be the limiter, I'm not sure how strong impact bits are. Hopefully much stronger than the "standard" bits.
I guess in the end drilling out the bolt heads (since they must be replaced anyway) might be the answer to the really stuck ones.
