Yes, it does have minus/negative marks. Once in a land far away I carefully checked TDC with the head off against the damper marks and the little tang.
As I remember, it was off a bit, but can't recall which way - big help Huh?
But, the system works off the rear crank position sensor, not the front one, and it's all adjusted electronically. So, in theory, timing should not be a problem; nothing to move or wear.
Of course, the cam can get retarded due to chain stretch; but tht won't affect the crank timing.
DG
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