Question about 2002 Kia Sedona

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Rear head cam marks

On the rear of head there is also 2 cam gears, the inlet cam gear is running with the front main timing belt, but the exhaust cam gear has to be put back to right position this is where i mucked up? i position the front timing to top dead centre,no.1 cyl up where do the exhaust cam gears on the rear have to be set at? please some 1 gimme some insight.posibly a diagram if possible, thanxs.

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  • Kia Master
  • 2,122 Answers

Hi There, Didn't see your name so it's difficult to be personal. Right mister Pimpernel, this is what we need to do. the timing belt synchronizes the cam shafts with the crank shaft. These must all run in synchronization so that the valves can open without hitting the pistons as the come up to Top Dead Center. This is what we need to do. Remove the timing belt and set the Crankshaft at TDC. You should then see a mark on the block (The front oil seal housing) which aligns with the mark on the timing gear. Make sure they are perfectly aligned! Next remove the camshaft caps and identify the alignment marks on both cams. Before proceeding further check to see if there is a spring loaded section on the camshafts If there is place the cams into a vise protecting them with strips cut from a rubber mat or something similar. Rotate the tension gear and lock it in position with a ten millimeter bolt. Look for the match marks on both cams and then align them so that when fitted they keep alignment. (At Top Dead Center the cam lobes of number one piston should be pointing away from the valve underneath. The stroke is at the end of compression and about to go to ignition. All valves for number one will be closed. The firing order is 1342, meaning that as number one is beginning the ignition stroke, number four will be on overlap, with the exhaust valves almost closed and the intake valves already beginning to open. The overlap is to make the expulsion of the exhaust gas more efficient and to help the induction of the explosive mixture of fuel and air. (Did you know the optimum mixture is fourteen and a half parts of air to one part of fuel?) There's a piece of useless information for you, but the rest isn't! Let me know how you get on. Regards John

Posted on Feb 12, 2012

  • equipt automotive Feb 14, 2012

    hi john; my names micheal, the kia im refering to is an 03 model kia carnival, v6 it has a timing belt at the front which runs the 2 inlet cams and crank shaft, but it also has 2 exhaust cams & inlet cams which are located at the rear of each head & have small belts running them. I was after the markings on the rear cam gears buddy! thanxs any way.

  • Hi Michael, I haven't seen the engine you're referring to, but the basic set up is the same as I've explained with the difference being in relationship to the firing order. Fact is the engine you're describing is a mystery to me. I would be interested in any info you come across related to it. We usually get deliveries of vehicles some years after the initial release and most of those are vehicles which have been used sold in the country of origin and imported to Africa. You can work out the timing marks yourself using the same technique suggested for the four cylinder, but adapted to the six. Using the TDC and valve overlap you should be able to set up the valve timing and then identify the timing marks. The engine you're describing is typically known as a DTOC (Double Twin Overhead Cam) meaning basically that it has four camshafts. The driving synchronizing mechanism is confusing. The engine type which keeps coming to mind is the Mitsubishi with contrarotating shafts, which are fitted to be a counter balance, making the engine smoother in operation. If you decide to try the way described, to be on the safe side when you have the timing set up, remove the plugs to avoid pushing against compression and rotate the engine several times by hand, using a spanner (wrench) fitted onto the crank shaft pulley nut, this to confirm the timing is correct and that the valves are not hitting or coming into contact with the pistons. Let me know how you get on because you can do it! Regards John

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