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What are the valve positions when cam gear is at tdc

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Hi from uk hope this will explain TDC valve positions ? when the crankshaft is at tdc this means that numbers 1 and 4 pistons are both at tdc but only one of the cylinders are on firing mode so if let us say in relation to 4cyl engine the fire order is 1 3 4 2 the c/shaft is at tdc ? but for which cyl ? 1 or 4 ? to check look if the camshaft mark is at its mark or check rotor arm ?if at 1 or 4 ? if it isat no1 cyl then both of the valves for that cyl are fully closed whilst no4 cyl valves are at the point of exhaust valve just closed and inlet just about to open this is correct for tdc number 1 cyl firing stroke ?ok so far ? now then if c/shaftmark is atTDC it may be number 4 cyl ready to fire? that is because the camshaft rotates at half speed to the crankshaft soyou need to rotate crank 360 deg to bring cyls 1 + 4 to tdc again then it will be cyl 1 at tdc on firing stroke along with rotor arm at No 1 plug lead and both valves for No 1 cyl will be closed (the cam lobes will be facing up whereas No 4 cyl valves will be pointing down ) hope this is clear for you to understand? if you look at any 4 cyl engine the sequense is the same for No 1 TDC but firing orders may change ie fords 1 2 4 3 is fire order they use as apposed to 1 3 4 2 ? OK? CURIOUSE why you asked? but best wishes and merry xmas from uk

Posted on Dec 07, 2008

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Hi trying to set the timing on my j1 elantra its a 16 valve and each cam has two marks on it.so my question is what positions should the cam lobes be at when timing is supposed to be correct.thanks


no 1 piston tdc
the cam lobes for no 1 piston should in such a position so that a slight turn of the cam shaft one way makes the exhaust start to close and the inlet start to open or the other way the inlet start to close and the exhaust start to open
this is known as valve rock or valve overlap and occurs when the cam shaft is properly timed to the tdc position of the piston
for a twin cam engine the cam lobes position will be the same operation just that the inlet cam rock will be for the inlet cam and the exhaust cam rock will be for the exhaust cam

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place crank at TDC. turn cam until all the valves over number one are closed. your valve train will now be in time. however there should be timing marks on the cam gear and crank gear, with the motor at TDC align the marks and your valve train will be in time. you dont have to have your valve adjusted, you can either watch you pushrods move or watch the valves move in an overhead cam application

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You need to turn the engine over and bring it up to top dead center (TDC). Aline your put the chain or belt on. The crank gear will be on you just will need to aline the cam gear as I believe it is overhead cam. Do NOT force the cam gear to turn as you can bend your valves. When you are putting in the distributer as you slide it in it will rotate a bit. Make sure it is alined to where your rotor will be faceing to the #1 position on the cap. I hope you understand. If need be I can look up the timing marks for the cam for you just post a comment if you need. When I say to bring to TDC you turn the engine over to where the # 1 piston is to the top of the cylinder. Hope this helped and good luck.

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Doesn't matter what engine it is as long as it has valves and uses petrol (not diesel), the camshaft lobes at cylinder #1 should always face upwards. This positions the valves at it's closed setting (combustion), this is known as Top Dead Center or TDC. With this in position, all your timing markers should align on their marks (cam pulley, crankshaft pulley or flywheel ring gear). Do not confuse yourself with other cylinders being this and that, as long as number 1 cylinder is at TDC or 0* you have set your timing correctly.

Pls. give this a rating, thank you.

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I tried to find a maual quickly but was unable. The year may help, but I think I can provide you with what you need.

The cam gear should have a dot, or a line on it, check both sides, you will be able to tell that you are at TDC when both the intake valve & exhaust valve are closed, on the #1 cylinder. The cylinder should also be at the very top of it's travel to be at TDC.

This is standard TDC for all engine valves on the #1 Cylinder.

I believe when you have it there, you will be more able to find the mark you are looking for to verify the exact position.


good luck

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