I have an 06 Quest when i last drove it, I was going up a slight incline at 60 mph. I heard a small metallic sound and the Quest lost. Power and died. It would crank but not start. My mechanic said I threw a timing chain. His repair quote was about $3600. My question is, if the plastic clip holding the tensioner broke. Would the repair be as costly. I was told I would need a water pump, oil pump, new timing chain and gaskets . does this sound right and is it worth it. I only paid $2500 or it with 120000 miles on it.