How do i mark my timing belt and take it off while doing a head gasket job on a 91 honda accord lx

you need back to the timing belt and re_check the marks for the timing belt this are on the camnshaft and cranck shaft put on the EXACT position .I think is all what you need if is not explain with more details tnk.

It's possible that the head gasket is blown. Symptoms of a blown head gasket are:

1. Lots of white smoke from exhaust
   
2. if equipped with auto transmission, check the dipstick- if the fluid is foamy, this is another example of a blown head gasket

It's best to bring the car to a shop and have a pressure test done on it. If there is a leak elsewhere, it should show under pressure.

The Ballancer Belt runs the ballancer shaft which was installed in the motor from factory to help offset vibrations in the motor or counter ballance for the engine to run smoother

I assume your talking about the timing belt marks for the crank and cam,heres a diagram to help you.

Sounds like the timing is 180 degrees out. You would have to unhook the belt and turn the crank 360 degrees and put the belt back on. I hope this helps!

Timing marks for timing belt,

If you're not a very experienced mechanic, take the car to one. You're going to be pulling off the cylinder head, which requires a LOT of teardown just to get to that point. The way you set up the engine before disassembling even the first bolt is critical, and there are about a hundred little tricks and techniques you're going to need to know before you do such a job.

Here's a photo of my wife's car from this past weekend (copy and paste into your browser) - I replaced the head gasket on her Honda Civic. This was several hours' worth of teardown and cleaning in preparation for installing the new gasket (the new head gasket is in the picture, lying flat with the four large holes for the pistons):

http://farm3.static.flickr.com/2785/4109568522_d7c707bd30_m.jpg

There are specific two-step torque sequences and patterns for reinstalling the head that are crucial to do properly or it'll never seal. I'm sure the information on how to do it, step by step, but if you're going to tackle the job, you'll need a lot of time, an extensive tool set, step by step instructions and torque specs for many of the subassemblies, quite a few new parts (head gasket, head bolts/studs, manifold gaskets, timing belt, timing tensioner, accessory belts, water pump, thermostat, all fluids (since they'll be drained before starting), etc etc etc). It's a huge job and one that is easy to screw up, and on a teardown of this level, one mistake can be all you need to destroy the engine.

take the timing belt cover off and look at the cam gears it should tell you the timing marks

Well basicaly there is no adjustment it has timing marks and the belt goes on with the marks on the points.cam pulley has a stamped mark up with line marks that go evenly one on each side has to be even with top of the head.crank pulley the woodruff key goes straight up facing the cam pulley.The balance pulley has a v mark on the pulley and a mark on the block and those go together, dont worry about the water pump there is not timing mark on that.Good Luck

Sounds like your timing belt is one tooth off on the cam, this I have seen before especially if it is a twin overhead cam. One tooth off will make it idle really low when stopping at the light especially if the engine is warm.