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And for just a bit more clarity, the alternator timing "T" mark will show every revolution, both compression and exhaust/intake overlap.
The cam marks will only show in their respective windows on the correct cycle for checking valve clearance. This is because the cam runs at half the crankshaft speed.
As a side note, if the alternator "T" mark is aligned with it's pointer and the cam marks are NOT centered it is possible the timing chain jumped a bit. This would be reflected by poor performance.
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