Question about 1996 Chrysler Cirrus

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I have the dist. rotor in the wrong position. How do I find TDC and compression stroke?

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Remove the spark plug from number one cylinder. With the coil disconnected, have a friend bump the engine over while you hold your thumb on the plug hole. You will feel the compression stroke and can check the timing marks if visible. Then with the distributor cap off point the rotor towards number one wire.

Posted on Mar 19, 2011

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Were do.I find the factory marks on my distributor and intake to stab it right, .on my 93 chevy 5.7


I don't know of any factory marks. You have to put the #1 cylinder at TDC of the compression stroke, then drop in the dist. so the rotor points to the #1 spark plug tower on the dist. cap. The rotor will turn slightly as the dist. shaft slides down, so you need to start the dist. with the rotor turned slightly back. When it drops down, the rotor will be pointing directly to the #1 plug wire tower. Repeat until you have it right. Then it will start, and after warmed up, set the timing with a timing light.

TDC (Top Dead Center) of compression stroke: there are two TDC's for each cylinder, the compression TDC, and the exhaust TDC. To find the compression stroke, pull out the #1 spark plug. With your finger over the plug hole to feel pressure, turn the crankshaft over clockwise with a ratchet and socket on the crankshaft pulley. As the piston rises on compression stroke, you will feel pressure on your finger (there is no pressure build-up on the exhaust stroke). As soon as you feel pressure, now just turn the crankshaft further till the piston is at TDC. You can use a straw or pencil in the hole to find the top, or just look at the pointer scale by the crank pulley. The mark or notch on the pulley will be at 0 degrees on the pointer scale, TDC of compression stroke-now drop in the distributor.

Apr 08, 2015 | Cars & Trucks

1 Answer

On a ram 1500 if I turned the pulley number of time and sstopped the groove at TDC but not in cylinder 1 position will the truck run bad or the timing offset?


the timing mark indicates where the no 1 piston is in the bore. It can be at tdc compression stroke (firing) or at tdc exhaust. If it is on compression stroke ( test by removing no 1 plug and feeling the pressure under your thumb) then the rotor button will be pointing to no 1 HT lead in the distributor cap. If it is on exhaust stroke the rotor button will be 180 degrees from no 1 ht lead . It it is point to no 1 HT lead on compression stroke the truck will start ___IF YOU HAVE THE CORRECT FIRING ORDER FOR THE ht LEADS ) and if it is 180 degrees out it will not start. If it starts and runs but backfires then you will have the firing order wrong on 2 leads

Jan 16, 2015 | Dodge Ram Cars & Trucks

1 Answer

I replaced my whole distributer in my 1992 2.8 liter v-6 s-10 but my son washed off the alignment marks, so I was wanderind how i can time it? please help!!!


If you know the engine's number one cylinder location, you need to put it at TDC of the compression stroke, then you lower the distributor in so that the rotor ends up pointing to the #1 spark plug wire tower on the distributor cap. As you drop it down, the gear on the dist. shaft will mesh with another gear and turn slightly. You want it ending up pointing directly to #1. Get it seated, then you can start the engine and set the timing according to specs with a timing light.

To find TDC of the compression stroke (as opposed to TDC of the exhaust stroke), pull the #1 spark plug out. Put a socket and wrench on the crankshaft pulley and turn it in its normal direction (clockwise), with your finger over the spark plug hole. As the number one piston is rising on its compression stroke, you can feel the pressure build up under your finger. You won't feel any pressure as the piston rises on the exhaust stroke, only on the compression stroke. So when you feel pressure, you know the piston is rising on its compression stroke, and you can turn the crank on around until the piston is at top of its travel-the notch on the crank pulley will now line up with the zero degrees mark on the pointer scale beside the pulley. There, TDC of compression stroke. Now drop in the distributor so the rotor tip lines up with the #1 spark plug tower on the dist. cap.

Sep 29, 2014 | Cars & Trucks

1 Answer

How to reset timing on 1992 454 tbi after replacing distributer


You have to put the number 1 cylinder at Top Dead Center of the compression stroke, and then you install the distributor with the rotor pointing to the #1 spark plug wire tower that is on the distributor cap.

Pull the spark plug from number 1 cylinder. You need a helper to turn the engine over by hand (using a socket on the crank pulley), or he can bump the starter over in very short bursts. Put your finger over the spark plug hole. When the piston is rising on the compression stroke, you will feel air pressure on your finger. Now look at the crank pulley and turn the engine on over until the zero degrees mark lines up on the timing pointer. Or you can stick a long straw or similar into the spark plug hole (don't let it drop into the cylinder!) to feel when the piston is at top of travel...see, you feel for pressure build up with finger (piston is rising on compression stroke), when you feel it, turn engine on over by hand until the piston is at top of travel-that is TDC of compression stroke. Now install distributor so that rotor ends up pointing directly to number 1 spark plug wire tower. Then follow firing order -as the rotor turns, it will follow the firing order around the dist. cap.
There are two top dead centers of each piston, tdc of compression stroke and tdc of exhaust stroke- to time the engine, you need tdc of compression-that is when the spark plug fires in the cylinder, so that is when you want the distributor in with the rotor pointing to #1.

Jul 28, 2014 | 1992 Chevrolet C/K 3500

3 Answers

How to insall distributer on 1966 ford mustang


Okay, you have to set the number 1 cylinder at TDC of its
compression stroke, and then drop in the distributor so the rotor is pointing to the #1 spark plug wire tower. This should start the car, then you could set the timing to spec with a timing light.

There are two TDC's of a cylinder- the compression stroke and the exhaust stroke. To find the compression stroke, take out the #1 cylinder spark plug. Put your finger over the hole. Now either turn the engine over by hand (with a socket on the crankshaft pulley-turn clockwise), OR have a helper bump the starter over in as short bursts as possible. As soon as you feel pressure on your finger- stop turning- the piston in #1 is rising on its compression stroke. Now check the timing pointer or scale by the crank pulley. Turn the engine slowly on over until the notch or mark on the crank pulley is right on the zero degrees mark on the scale. This is TDC of compression stroke-the piston is at top of travel in the cylinder. Put the distributor in so the rotor will be pointing to the #1 spark plug wire.

May 24, 2014 | 1966 Ford Mustang

1 Answer

1992 chevy 5.7L 350 8 cylinder engine. I took the distributor shaft off without marking it. How do I know it is in the right position when I replace it?


You have to retime it. You put number one cylinder at top dead center (TDC) of compression stroke, then drop in the distributor so the rotor is pointing to number one tower on the distributor cap.
To find TDC of compression stroke, remove number one spark plug. Use a socket and ratchet on the crank pulley and turn clockwise. Keep a finger over the number one spark plug hole. When turning the crankshaft and you feel pressure against your finger, the number one piston is rising on the compression stroke. Now use the ratchet and turn the crankshaft on around until the crank pulley notch lines up with the zero mark on the pointer scale. Piston will now be at TDC. You can now drop in the distributor. When seated, the rotor must be pointing to the number one cylinder on the dist. cap tower. Dist. shaft will turn as it is seating-if you get it wrong, pull up distributor and reposition the shaft until it drops down into the exact right position. When done, start the engine and use timing light to set the timing to specs.

Sep 10, 2013 | Cars & Trucks

1 Answer

Overbored a cl175 50 thousands .cant get it timed.acts like it is out 180.


You're wrong. It should not fire when the exhaust valve is open-that is the exhaust stroke. As the piston moves down after the exhaust stroke, the intake valve opens and the air-fuel mixture is pulled into the cylinder. Then piston travels up, compressing the mixture( both valves are closed, now), and at the top of this stroke the ignition fires, driving the piston down.
Sounds like your timing is a bit too soon, if it's firing when the intake is open. Try retarding the time just a bit.
If that doesn't work, find tdc of the compression stroke of number one cylinder: pull the sparkplug out and turn the crank around by hand (with a socket on the crank pulley) with your finger over the plug hole. As the crank comes around to the zero mark (TDC), you will feel pressure bui;ld up on your finger if you are on the compression stroke. If you are on the exhaust stroke there will not be pressure buildup as the piston approaches TDC. Once you have number one cylinder at TDC of the compression stroke, the rotor will be pointing to the number one plug wire tower on the distributor cap. If the dist. is off 180, rotor will be pointing opposite of number one.

Nov 01, 2012 | Cars & Trucks

1 Answer

Regaurding firing order on 1993 chevy G20 350 small block is 1 8 4 3 6 5 7 2 but WHERE does number 1 START? ... clock wise I was told and there is a manifacture raised line between two posts IS THAT WHERE...


Yeah, likely that raised line is your starting point. #1. Try lining up your crankshaft pointer(turn with a socket wrench on crank pulley) to 0 degrees. If you are on compression stroke on cyl. 1, your rotor will be pointing to no. 1 plug tower. If you are on exhaust stroke of no. 1 cyl., then your rotor will be exactly 180 degrees off. If you are confused, just turn your crank clockwise one turn (360), and line up zero again. Now your rotor will be (again) either pointing to No.1 position, or 180 degrees off (pointing in opposite direction)One of those positions should line up with that manuf. mark. (Here is easiest way to find TDC of #1 cyl. on compression stroke: pull #1 plug out. Hold finger or thumb over hole, while turning crank, when you feel pressure building on cyl, you are approaching TDC of compression stroke. Just turn crank (clockwise) till pointer is on zero. Done!) Now your rotor will definitely be pointing to #1 plug on your dist. cap.

Oct 30, 2011 | 1993 Chevrolet K1500

1 Answer

Replaced old distributor with new "OE" distributor, but failed to mark old rotor position. I know to find #1 cylinder - do I aim rotor at #1 position when TDC is located?


you need to make sure you are on the compression stroke when the piston comes up to TDC for cylinder #1. Most times you can just feel the compression with your finger over the spark plug hole. After determining the #1 cylinder is at TDC on the compression stroke, note the position of the #1 spark plug lead on the distributor cap. You will need to line up the rotor with the terminal inside the cap for #1.

Jun 04, 2011 | Pontiac Firebird Cars & Trucks

1 Answer

My car turning over but not starting up . had just put lifters in it and i did pull the distributor and i plowed #1 brung it up TDC andset it down were my rotor pointing at #1 witch is in the front on the...


When you brought the #1 to TDC, was it compression stroke? Might it have been exhaust stroke? If yes, go back to TDC and rotor at #1, then pull dist, rotate engine 360, and reinstall dist.

Sep 24, 2010 | 1991 Cadillac Fleetwood

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