I have a 2010 EX-L with 180,006 miles. Six months ago the alternator went out at 175,300 miles. While looking at what it would take to replace the alternator, I figured the timing belt change interval was coming up and would do it all at once. I ordered a Honda kit which included the TB, idler pulley, tensioner pulley, tensioner, pully mount bolts, water pump and seals. I followed steps from a couple of good YouTube videos and used torque specs from an online manual when assembling everything. All seemed to go together well and it started up and ran well after the job was complete. After about 3000 miles it developed a coolant leak. Grrrrr. I couldn't tell exactly, because of access, but the leak was coming from the general area of the water pump. How could this be? I didn't have the time to get into another water pump replacement so I did the lazy thing and put some coolant Stop Leak in the radiator. That seemed to stop the leak. Then after another 2000 miles, while my daughter was driving through a residential area last week at about 25 mph, she said it just died without any lights flashing or making any sound. Eventually, I was able to look at the valve springs through the oil filler cap, while she cranked it, and could see no movement. The valve camshaft was not turning. How could that be? I thought it might be a bad (seized) pump or pully, but when I tore it down and did the inspection I could find nothing wrong besides a broken belt. Pulleys (idler, tensioner, and pump) all ran freely. Tensioner checks out, no leaks and moves in and out slowly in a vice when actuated with a lot of force. I will have to pull the heads for reconditioning but I do not want to proceed until I determine what caused the belt to fail (ripped into 3 pieces). I am baffled and frustrated. Does anyone have any ideas?