Question about Hyundai Motor 2004 Sonata

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I just replaced the timing belt on a 2004 sonata

I just replaced the timing belt on a 2204 sonata with a 2.4 and now I have a vibration in the engine the cams and the oil pump and the balance shaft marks are all in alignment

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Did you put alot of pressure on belt when installed ? to tight will cause that vibration

Posted on Feb 08, 2010

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It's the oil pump balance shaft. If you rotated the oil pump gear at all you knocked it out of whack. The shaft turns like 2.5 times for every rotation of the gear. You need to remove the bolt on the side of the engine kind of mid-way of the hump for the balance shaft. Remove the timing belt again. Stick a screwdriver into the hole where the bolt was. Rotate the oil pump gear until the timing marks line up AND you can stick the screwdriver all the way in the hole. The balance shaft has a flat spot that will allow the screwdriver to go in only when it is in the correct position. You'll notice that you will have to rotate the gear a few revolutions in order to achieve this. Once both conditions are met. Re-install the timing belt, leaving the screw driver in the hole until assembly is complete to keep the shaft from turning. Replace the bolt. Start the engine and the vibration should be gone.

Posted on Jul 02, 2012

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