Question about Chevrolet 2004 Chevrolet Aveo

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Timing belt broke how do i make sure crank is on tdc on compression stroke cam gears

I just line the arrows up. Crank has a mark to line how do know compression from exhaust stroke

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  • Chevrolet Master
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On a petrol engine remove the spark plug and put your finger over the hole to seal it. Get somebody to turn the engine for you.

You'll feel the compression build up - that's the compression stroke.

If your distributor has a rotor arm inside, the rotor will be pointing more or less at no1 lead.

Posted on Feb 09, 2016

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Right, so you have two TDC's-the exhaust stroke and the compression stroke Top Dead Center-and both occurr when the crank hits the zero mark on the timing scale.
Always set timing with the number one cylinder at TDC on the compression stroke. How do you know which is which? If you have a distributor, the rotor will be pointing to number one cylinder tower, when at TDC of the compression stroke. If you are on the exhaust stroke's TDC, the rotor will be pointing just opposite of number one .
If you don't have a distributor, look at the valves for cylinder one under the valve cover. If at TDC of compression stroke, both valves will be closed. At TDC of exhaust stroke, the exhaust valve will be open.
You can also find the compression stroke on number one by pulling out the spark plug for number one, and either put a wrench or socket on the crank pulley and turn it clockwise, or use the starter and bump the engine over in short bumps. Put your finger or thumb over the spark plug hole and feel for the pressure to build up. As soon as you feel pressure on your finger, (if turning by hand, pressure will be slight, but you can feel it) you are on the compression stroke. Stop bumping the starter and turn the crank on around by hand until the zero mark lines up on the timing scale-TDC of compression stroke! The exhaust stroke will have no pressure build-up as the piston comes to top-because the exhaust valve is open. On the compression stroke, both valves are closed as the piston travels up the cylinder.

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