Question about 1999 Mercury Cougar

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I have a 99 cougar 2.5 i have the valve covers off and its tdc how can i tell if its jumped time wheres the marks point

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It is on the balincing wheel on the front of the engine ther will be a v groov in the wheel. you will have to pull no1 spark plug to deterrmin TDCwhen no one is at the top of its travel before the intake valve opens you are at TDC when that happens the timeing mark should be lined up with the mark on the frame. If you are not familure with this procedure go to sn suto psartd store and get a book on you car. if you think you have jumped time check the distributor to se if the rotor when you are TDS is pointing to no1 to fire the spark plug.

Posted on Jul 21, 2009

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1 and 4, 3 and 2 are companion piston, you could do the same with 6 or 8 cylinders, you must know firing order

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Where does distributor rotor point for tdc


You can't use a distributor to find TDC. To find it you have to turn the engine over until the timing mark on the harmonic balancer ( bottom pulley) lines up with the 0 on the metal tab on the timing cover. When these 2 marks are lined up that is TDC.

HOWEVER, the crank makes 2 turns to every 1 turn of the camshaft so you hit TDC twice. To make sure that you are right you must remove the valve cover and watch the valves as you turn the engine. The proper thing to see is the intake valve ( farthest from the exhaust manifold) open and starting to close as you come up on TDC. As you go past TDC the exhaust valve (closest to the manifold) will start to open. If this is not what you see turn the engine over 1 complete turn to line up the timing marks again. At this point, where the rotor button points is #1 spark plug.

#1 piston, on a GM is always at the front of the motor. If you have a V6 or V8 then #1 will be at the front on the driver's side of the engine. On a 4 cylinder it will the first cylinder. Hope this helps.

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When #1 piston is up the rotor can be pointing to 2 different places. For every 1 turn on the crankshaft the camshaft turns 2 times. To be sure that the rotor is in the right position to fire #1 spark plug you need to remove the valve cover and watch the valves as you turn the engine. To be correctly positioned the intake valves have to be open and stasrting to close as you turn the crank to align the timing marks (TDC). As you pass TDC the intake valves are closed and the exhaust valves start to open. Back up so the timing marks line up and this is where the rotor is going to fire #1. If this is not what you are seeing, then simply rotate the engine 1 complete turn and you should see it happen then.

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OKAY, THE BEST WAY TO NOT BEAT AROUND THE BUSH IS,
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1 Answer

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first of all you say timing belt so i assume its a 2.0 litre. well you have to pull valve cover and install a special tool in back of both cams to lock them from moving,they are specified and offset so only one way the alignment tool is inserted in back of cams,looks like a metal ruler. you also have to install a blank plug to stop the crank at tdc,it hits counterweight and stops crank from rotating,also the key will be at 12oclock and a notch on balancer lined up on oilpan and 1 and 4 piston will be tdc. you will need the special tools or will may be a tooth off and thats bad to do it twice,also replaced tensioner when you do belt.

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