How to find Top Dead Center? - Ford Mustang Forum
 
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post #1 of 8 (permalink) Old 04-27-2007 Thread Starter
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How to find Top Dead Center?

i know it sounds like a stupid question, but i think my balancer is off because my stang was pinging at 10degres with premium, and some people have told me to rotate the engine till TDC then check the balancer to see how far it is off, how do i know when its at TDC, do i crank the engine until the distributer rotor points to the #1 terminal

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post #2 of 8 (permalink) Old 04-27-2007
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Originally Posted by 87stang 5.0 View Post
i know it sounds like a stupid question, but i think my balancer is off because my stang was pinging at 10degres with premium, and some people have told me to rotate the engine till TDC then check the balancer to see how far it is off, how do i know when its at TDC, do i crank the engine until the distributer rotor points to the #1 terminal
Remove the #1 spark plug and stick your finger in. When the piston reaches it's highest point that's TDC +/- 2-3 Degrees. It's hard to be extremely precise unless you can take the heads off and use some measuring equipment. The distributor measures your mechanical advance, so if the balancer is off and showing 10 and you are actually at 20 it really won't show you anything.

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post #3 of 8 (permalink) Old 04-27-2007 Thread Starter
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could i pul the valve cover off and look at the valves and tell that way( i have them off) the intake valve would be opening at TDC right?

New addition: 1986 GT t-tops 5.0L 5speed, intake, exhaust,9mm plug wires

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post #4 of 8 (permalink) Old 04-27-2007
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could i pul the valve cover off and look at the valves and tell that way( i have them off) the intake valve would be opening at TDC right?
that'd be tough to tell honestly... because of durations and overlap.. I'm not really sure on the stock Mustang cam. Someone better than I could answer that.

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post #5 of 8 (permalink) Old 04-28-2007
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Pull the #1 cylinder spark plug out of the engine and then have a friend bump the starter one rotation at a time until you feel compression escape around your finger which should be pressed against the empty spark plug hole. As soon as you feel the compression do not hit the starter any more. this might get you close enough to tdc on the compression stroke.
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Also I'm sure you already know but just in case remember to disconnect your coil wire.
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post #7 of 8 (permalink) Old 04-28-2007
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Pull the #1 cylinder spark plug out of the engine and then have a friend bump the starter one rotation at a time until you feel compression escape around your finger which should be pressed against the empty spark plug hole. As soon as you feel the compression do not hit the starter any more. this might get you close enough to tdc on the compression stroke.

If I might add, after doing the above, sick a pencil or something similar in the #1 spark plug hole, and slowly turn the engine by hand while watching the pencil rise. When it reaches it's highest point, you're at TDC.

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post #8 of 8 (permalink) Old 05-13-2007 Thread Starter
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ok i pulled the pass side head off and i have the 1st piston all the way to the top, so then the blancer should be at 0 degres tdc right, because its not its more like-10degress, i have a pic of where tha balancer is at the, white mark is around 10 or 11 degress advance
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New addition: 1986 GT t-tops 5.0L 5speed, intake, exhaust,9mm plug wires

1987 Mustang LX 5.0 5-speed,white with smoke grey interior,MAF conversion,Perfection clutch(valeo)2.5inch Ravin exhaust, subframe connectors, ported lower intake & heads=SOLD
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