Well, by the sounds of it, you have an sohc, with only a single cam gear. You are going to have to pull the valve cover and timing belt covers. I am not sure about the sohc's since I really only work on my dohc's, but there is a lower and upper timing belt cover. After you have done this, loosen up the timing belt tensioner pulley bolt, loosen up the timing belt enough to slip it off of the gear, and tighten the tensionioner back up so you aren't fighting the spring when you try to reinstall the belt. With the timing belt off, check to make sure the crank is somewhere in the middle of its stroke, so no pistons are going to get tapped by any valves or vice versa. Just make sure it is somewhere in between top and bottom dead center. Now loosen the adjusting bolts on the cam gear, and set the cam to 0 degrees, which is the stock position, then tighten the bolts back up so it wont slip. Set the cam to 1st cylinder TDC, you should see the #1 valves fully closed, i.e. the cam lobes are not pushing on the rocker arms. After that is set, set the crank at TDC. There is a mark on the crank pulley that lines up with a mark on either the block or the timing belt cover. If it is not on the block, then temporarily put the lower cover back on and set the crank TDC. Then you slip the timing belt back on, making sure that you don't rotate the crank or the cam in the process. loosen up the tensioner pulley bolt again and let it take up the slack in the belt, then tighten the bolt back up. Reinstall the covers, and turn on the motor and let in run for like 30 seconds, and turn it off. Recheck the timing belt tension, and loosen the tensioner bolt and let the tensioner take up any remaining slack if there is any. Tighten it up, check to make sure the covers are on tight, and you should be good to go. If you want to set the cam timing different than stock, do that instead of setting it to zero in the steps above. Hope this helps.
