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What may be confusing is that when the timing gears are installed correctly with the hash marks lined up, the engine will be at TDC for #4 because the keyways are cut into the gears to make it that way. So as long as the hash marks line up when the engine is rotated, the camshaft to crankshaft timing is set correctly. I don't know why this is, but it is.
But the procedure in the manuals for installing and timing the distributor/oil pump drive gear, the engine is supposed to be at TDC for #1.
But if only the timing gear(s) are being changed and not the camshaft, it is of no concern because the drive gear doesn't need to be removed.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502
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