1 Year no replies, so I thought I’d add this, we had the same issues, but the Wartsilla TFA had a premade Fixture that clamped onto two head-studs, and then you would pass a 3/4′ drive extension between two Heim-joint Swivels, to stabilize the extension while torquing, and was able to retourqe all CAR to Block bolts. On a few we had to cram ourselves between the heads and use a Right Angle Drill with a left handed drill bit to extract the broken bolts.