Recently my sonata 2.0 gls cam belt snapped. we

not 100% certain if I'm getting right where ur coming from, but, I'll take a shot-- with tensioner set, revolve engine with socket on front pulley bolt...this will of course thrust up any slack in belt as if engine was actually running..round and round once twice, three time, and back to TDC on compression...see if cams are coming up at correct or very close to correct angles at each compression-stroke TDC. If not, trial and error with resetting your tensioner until you have judged it right and have the angles coming up three pears every comp stroke TDC..

The snapped belt has a number mark.

How To Install Replace Engine Serpentine Belt Volkswagen ...

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Dec 31, 2011 - Uploaded by 1A Auto Parts
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VWVortex.com - Broken timing belt, valves likely bent

forums.vwvortex.com > ... > Golf IV & Jetta IV

You can have your mechanic pull the valve cover. Loosen the bolts that hold the cam(s) in place and do a compression test. If one or more cylinders is low on compression the motor is junk. If the compression test is fine reinstall the cam and replace the timing belt and you should be good to go.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

First remove all. Power-steering pump 3 bolts on cylinder head. Loosen the alternator. remove the two belts. Underneath the car. remove black wheel arch plastic cover (6 or 7screws) Loosen the air con pump tension-er pully. Remove belt. put a trolley jack under engine as the mounting needs to be removed and lift the engine slightly. Remove the engine mounting bolts next to the black cam belt cover and remove the mounting. Loosen the Main crank shaft pulley. Normally very tight put a power bar and socket on. engine turns forward so let the bar rest on X member and turn the key only so that the engine turns. do not start. Remove cam belt covers (comes in to parts - top and bottom) then loosen the tension pulley which is on the left. 1 x bolt in middle. remove cam belt. now the tricky part. Replace the bottom crack pulley. turn so that the marks are lining up. the cam pulley has got a small hole in turn the hole upward to the top of engine. there is a small dot on the cylinder head which can be seen through the hoe. line up. replace idle pulley on the right. replace tension pulley on the left. put new belt on and now to tension the belt. take a number 5 or 6 allen key and turn the tension er clock wise until its like a watch at 10 min to the hour. tighten the bolt. test belt with fingers. if belt to loose you will feel the belt move easily. belt must not be to hard when pressed. try to turn the belt with fingers half a turn if going passed the halfway mark tighten some more. Use power bar and ensure engine turns properly meaning two or three full turns with hands without it getting stuck. otherwise the valve and piston is toughing. if so do crank turn of 180 degrease. free turn again. should be right. replace all that was taken off. start car. if belt tension is to tight you will hear a signing sound.

You would have to proceed like you were going to change the belt until you could see it to inspect it. Here is a link to instructions on inspecting and replacing it.
http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0996b43f803786a9

The sonata has a 16 valve machine and works with a timing belt and not a timing chain. if the belt snaps it will bend the valves. not all the valves but some of them. a secondhand top with valves shouldn't be expensive. I would change all the valves. sometimes a valve cen bend so minimal it can't be picked up by the eye. you don't want take the top off again. it's a fairly simple machine. a mechanic should help you with the timing once you're done. good luck

more than likely you have a bad oil control valve if in fact you have an 06 sonata. They are chain driven engines... You can ohm out the valve and get a good reading even when the valve is bad. Pull it out and check to see if it is clogged, if it is thats more likely your problem. If it is clean, go ahead and replace the valve. Hyundai calls them the oil control valve (OCV) and usually located on the head close the the variable valve sprocket.

most belt manufacturers recommend 60,000 miles or sooner, some car makers say 80,000 but it is better to change it early than have it snap and ruin the engine.

Severe engine damage to the head, pistons and valves can occur if the belt snaps, the faster the engine is going, the worse the damage. Even at tickover / idle a belt breaking will bend most of the valves in the head so it is prudent to do it as soon as it is required. Also check if the water pump needs doing at the same time, as it needs the timing belt off to do and may be near failure due to having a plastic impeller. Make sure the belt idlers and tensioner are replaced with the belt.

look at the belt for visible cracks and frays if visible replacement is needed and i believe they are under 20.00

yes they bend valves
head needs to come off and valves will need replacing
this can be repaired
timming belts on these should be replaced every 60,000km