sound reasonable...

bakit lagi nagkakaganon timing belts mo? sa isang mekaniko ka lang ba nagppunta?

baka mali yung settings ng timing mo, kasi it's either tumatalon yung timing belt at nadudulas yung ngipin, or mali yung install. kaya your 4d56 engine chews up a lot of belts. check mo din yung main pulley ng engine mo for the timing belt, sa pajero ko kasi square yung ngipin dati, tas yung ibang pulley round. so you need rounded teeth timing belts for round teeth pulleys, and square teeth belts for square teeth pulleys. else dudulas at tatalon yung timing belt.

after overhaul, have the engine checked by a mitsu engine expert. baka kasi all this time you've been running on wrong timing settings.