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Looking at the engine from the front of the vehicle, find the crankshaft pulley, it should be below the fan pulley (toward the ground). There is a small mark on the crankshaft pulley. Also mounted on the engine the is a piece of metal that looks like teeth kinda looks something like this - ---vvvvvvvvvv/\vvv--- Those are your timing marks. Each tooth is one degree and the larger concave space is TDC of the compression stroke for the #1 cylinder

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โˆ™ 2006-08-13 19:11:20
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Q: Where are the timing marks on a 1991 F-150 4.9L and what do they look like?
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