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That's just leftover terminology from the good old days. Correct, it not TDC but about 20 degrees advanced.
These engines are not designed to be timed by anyone without a computer designed for the task. Timing is taken care of by the ECM, so long as the timing marks are close. IE, being one tooth off usually doesn't make that much difference.
Also correct about the crank timing mark. That is a real bugger to see and line up correctly. Nothing like my easy to see 120S engine.
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My back feels better when I sit in a Volvo seat
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