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Assuming that everything MECHANICAL (ie, camshaft, timing chain) is working properly: pull the #1 plug, put your compression gauge tube in the hole WITHOUT connecting the compression gauge (assuming you have a 2 piece compression gauge), put your finger over the hole in the compression gauge tube, turn the engine by hand, using a long rachet and socket until you feel the compression. At this point you have 2 options, slowly turn the engine by hand until pressure stops and you start feeling vacuum, then turn the rachet the other direction a couple times until you have split the difference between compression and vacuum. It's actually a pretty good guess, but if you can see the timing mark you can get it EXACTLY on TDC.

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โˆ™ 2006-09-01 21:19:43
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Q: How do you set No 1 cylinder to 0 degrees top dead center TDC of compression stroke in a 1997 ford explorer v8?
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