'Harmonic balancer' is just another description for the crank pulley. There is a rubber cushion sandwiched between the concentric hub and belt pulley sections of the crank pulley that absorbs minor, normal engine vibrations. You could have damaged it during removal, but I doubt this is the cause of your current dilema. ================================= I found where it is.... I don't recall damaging it or doing anything to it.
You did *something* wrong or this vibration would not be occuring right after the repair. For purposes of diagnosis, it matters whether the engine currently has full power or not. IOW, is the engine misfiring due to bent valves or an improperly installed timing belt, OR is it running properly and the vibration cause lies elsewhere? ========================================
The engine has full-power and is otherwise acting normally. No noises, no smoke, no vibration in drive, normal gas mileage, etc.
If the engine is running properly, you may have damaged an engine mount during removal/replacement. Did you have to take a mount off or pry on it at any time? This would seem to be the most likely cause of vibration only in gear (unless your perception/description of the vibration isn't quite accurate). ===================================== Yes, I had to take one engine mount off. I put it back in place, and I thought I torqued it right. Maybe I damaged it somehow? Maybe I damaged the engine mount on the other side, by jacking up the engine?
Or did you crank the engine with the timing belt not on correctly and nick valve(s), causing the engine to lose compression and run poorly (vibrate)? Did any of the cam sprockets spin out of control while you were trying to hold them in place during belt replacement? That alone could nick a valve. ============================= I did. The first time I put on the timing belt, it went on completely wrong and I tried to start the engine. It did not start. Is this Mazda
2.5L engine non-interference engine? I heard it was.