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I had forgotten about TRAC midsection. That’s another 4 degrees of negative trim you didn’t need in this application. All the more reason to get going with trim up and then trim down before taking off. Bass boaters have been doing this forever.
TDC tool in this case won’t help you diagnosis the flywheel hub magnet. It’s locates the flywheel key and the markings on the flywheel rim, but can not tell you where the slipped hub is at. You just have to do that visually. Other things happen to the magnets in the hub, but we will hope just a loose hub could be the problem here?
More oil is not going to save you from scoring a cylinder if the bridge port is sawing the rings! Just part of the early design. When these engines were repaired (bored) the bridge is relieved so it doesn’t destroy the rings.
Dan in TN