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TDC is when the piston is at top dead center of the compression stroke. The easiest way to set it at TDC is to remove spark plug number one and insert a slim item such as a pencil or screwdriver into the spark plug hole and turn the crankshaft clockwise with a ratchet or breaker bar as you watch when the piston starts coming up. Remove the pencil or screwdriver and inseret your finger tip into the plug hole to feel for pressure (compression) building up. When you feel compression building up, remove your finger and re-insert the pencil or screwdriver to see when it reaches the top; the piston will be at TDC and the timing marks should be aligned. NOTE: The crankshaft rotates twice for each time the piston is at TDC.

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Q: Setting TDC on a f150 4.9l stright 6 when timing mark is 180 degree from the TDC when timing mark is at TDC and piston down how do you get tming mark the same?
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