When a Timing belt job is done on a 2001 4 cyl sonata , should the mechanic replace the counter balance belt

Now I hear a noise at 107K , so If I have the job done what ball park figure $$$$$are we talking about in price for such a job.

ORIGINAL: ken99

There is no counter balance belt on the engine. I think the counter balance shafts are gear driven off the oil pump drive. There are 2 drive belts serving the water pump, air conditioning compressor and the power steering pump.

I would have the noise diagnosed before automatically spending money on a timing belt replacement. The noise may be unrelated to the timing belt, which can still wait ~9K miles before replacing it. If dealing with the noise means partially disassembling the engine, yes, you could have the belt replaced now. Timing belt replacement cost? $300 to 500 depending on where you have your work done, an independent mechanic or a Hyundai dealership.

Thanks Ken but I found different information on the counter balance belt on the Hyundai shop manual

Now I hear a noise at 107K , so If I have the job done what ball park figure $$$$$are we talking about in price for such a job.

ORIGINAL: ken99

You are right and I stand corrected. I pulled up the diagram for the oil pump.

[IMG]local://upfiles/4972/067AD3936EF84A8F843CED4CCED2B370.gif[/IMG]

It appears the counter balance shafts are coming off the oil pump gearing. The diagram you refer to shows "timing belt B" driving a "counter shaft", but I found another reference that confirms this is the right side counter balance shaft.

I would still have the noise identified before automatically replacing both timing belts.

did you think the counter balance belt should also be replaced with a new timing belt while its all opened?