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If the distributor has been out of the truck recently, could be it wasn't reinstalled correctly. If the distributor has not been disturbed, sounds like a timing chain problem. ANOTHER ANSWER: Every time the rotor turns one complete round the crankshaft will turn twice. Knowing that, the crankshaft will pass TDC TWICE while the rotor will only point to the #1 cylinder once. If the crankshaft is at TDC and the rotor is not pointing at #1 it may just be that the rotor is pointing directly opposite. If that's the case, just turn the engine by hand, once around until it's pointing at TDC again.
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The crankshaft turns twice for every rotation of the distributor. Turn the engine 360 degrees (once around) and it should bring up #1TDC.
The camshaft turns at half the speed of the crankshaft. If you count the gears, you should find that there are twice as many on the camshaft. If you line up the marks at TDC, then turn the crankshaft 360 Degrees, you should find that the camshaft has turned 180 degrees. So, every time the crankshaft turns back around to TDC, the camshaft will turn 180 degrees and if that's what your're seeing, then everything is normal.
It will be at 12oclock stright up.
The crankshaft pulley should have only one timing mark, and that is the one for TDC There are 5 markings. Looking from the front of the motor the marks start at right 15btdc, 10btdc, 5btdc, TDC, 5atdc. Top dead center will be the second marking from left then.
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.
Could be the TDC Sensor, sometimes called the crankshaft Sensor.
Here is a pic of it...You have to have it to replace the crank sensor on the newer Foeds...Jim
inside the distributor along with the crankshaft position and cylinder position sensors
I really need to know how to tell if i have a loose crankshaft or crankshaft position sensor. Or could it be the timing belt . We just put in a new water pump but the timing belt was on TDC when we were done. PLEASE HELP !!!! Its running pretty crappy...
The engine has a crankshaft that is connected to all the pistons in the engine. When the engine is running the pistons are moving up and down and are turning this crankshaft. The crankshaft in turn is spinning a shaft connected to the transmission. The transmission is turning a driveshaft that is connected to the differential which in turn is turning an axle connected to the wheels.