long story short my car died and when i got it all apart i found the crank sensor was ruined and the balance belt was just a belt, no teeth. timing belt was fine and new though. does a broken balance have the same effects as a broken timing belt or is it just a matter of getting a new one and thats all. im not replacing my motor for the 3rd time.

the balance belt will not do any damage if it breaks, so just replace it (making sure all the marks are lined up)

marks on the timing belt sprockets right?

yes there are marks

Dear kit,

The balance belt normally does take out the crank sensor when it breaks. You will do no long term damage from a few hundred miles of operation with a broken balance shaft belt, but the engine will vibrate heavily. Once you replace the inner belt and the crank sensor, your engine should run fine.

did your mechanic advise to replace the timing belt but not the inner belt? This is penny wise and pound foolish. the inner belt is only $15.

The alignment of the balance shaft requires locating the flat side on the shaft and blocking this in that position with a long bladed flat screwdriver through the alignment hole in the back of the engine block.

Byron

I saw a TSB last night that when changing timing belt, the balance belt should also be replaced. My sonata is "almost" due for its 2nd timing belt replacement. so, I thought i would go and check. Here is the TSB attachement


Attached File(s)
 Timing_Belt_TSB_07_20_001pdf.pdf ( 123.83k ) Number of downloads: 100

thanks for the help byron . no mechs looked at it, just me. i just had a new motor put in from the previous belt snapping under warranty. my new plan is to get a crank sensor and at least start the car to see if no damage has been done. if all is good its going to the shop for everything. ive been reading that i can run for a bit with no balance belt so itll save me the hassle of getting everything on and having bent valves. the car as it sits now is completely down to the timing belt. all acc. belts are off, water pump pulley off, crank pulley off, timing cover off. im gonna start it this way as i cant see any harm being done for a 20 sec start and run. someone please correct me if im wrong on this assumption. i plan on doing this in a few days at the latest.

There is another good TSB that helps to correctly index the oil pump sprocket. See TSB 01-20-002-1. If you haven't already done so, go to hmaservice.com and register for free Hyundai service info, including all Hyundai TSB's.
Regards,
Rob

well ive got it running. after sitting for over 6 months she lives. as mentioned before i pulled all the parts off to access the timing belt area. i found the belt to be fine (though i suspect it may have jumped a tooth but thats just a thought, no evidence) the ballance belt was completely shredded. when i removed the crank sensor it had indeed been broken by a belt tooth. i got a replacement after much debate as to wether it is worth it and installed it tonite and the car fired up. mind you the car was still in peices, no belts or service covers at all. i zip tied the sensor wire to the front motor mount so the exposed timing belt wouldnt hit it. the car ran for about 30 sec before i shut it down. i did notice a few thing though. while i didnt rev the car high it did have a ticking noise from the timing belt area. im not sure if its a bad valve or just because i have no accessories hooked up or covers on but it is an issue for now. i removed the oil fill cap to swee if the noise got louder and it didnt but thier was a lot of air coming from their. i know some should be coming from their but this was a lot. the car seemed to rev fine and idle good though. im planning on reassembling the car this week and driving it abit. im still very concered about running with no balance belt however. ive been told on this forum that is ok to run for a bit (thanks again byron, youve been spot on for everything) while some say the car will be damaged ( thats the dealer) while some say its no big deal to eliminate it completely (thats the racers running hondas and the such). im leaning towards byrons suggestion thats its ok for a few hundred miles but id like some reassurance. ive come pretty far with this and i dont want to make anymore mistakes cause itll be the cars last.

the car is back together now with no balance belt. it does have a decent tick coming from the passenger side of the motor, im guessing bent valve, but it does run and drive fine. my alt was seized from sitting so i had to pull it and use an impact gun to loosen it but seems ok for now. brakes were also seized but a few hammer blows fixed that. im not getting any vibs at speed from the lack of balance belt. if i were to guess id say the car feels even faster now. im probably not gonna put another one in for a long time. im gonna drive it as is for the time being. no sense dumping money into it if the valves are gonna let go, which it seems like they are.

Dear kit,

To confirm a bent valve, your mechanic can do a cylinder leakdown test. For this test, the mechanic rotates the engine so the suspect cylinder is intake valves closed and exhaust valves closed, pumps 100 psi in the sparkplug hole with a special coupler, and watches the pressure guage for 5 minutes. If the pressure drops immediately, you have a burnt valve or bent valve stem preventing a proper seal.

If the engine runs faster than ever, great. Normally a bent valve or burnt valve does not make your engine run faster.

Since you describe this noise as a ticking, and considering how many other things 'froze' up, you may have a sticking hydraulic lash adjuster. You can confirm this with a long bladed screwdriver, touching the suspect area of the valve cover, and placing your ear against the screwdriver handle. Sure enough, if the ticking is loud and distinct at the valve cover, your noise is outside and above the cylinder head. you could try something like Marvel Mystery Oil to break loose this sticking hydraulic lash adjuster.

Byron

thanks for the suggestions. ive tried listening to the valve cover area and other parts but no to hard since its been raining. i havent taken the car for a long trip yet so im not sure if itll work its way out. do you suggest i pull the valve cover and use the mystery oil if i find a stuck valve lash or do you have another way. its definately in the motor though. it was making the same noise with no accessories attached. im gonna change the oil this weekend since it old and cruddy and see if that changes the pitch of it.