possibly the crank shaft wasnt aligned correctly? I'm not exactly sure about 1/4 turns and 180* turns of the crankshaft or whatever, but i know that pistons at cylinders 4 and 1 have to be TDC when you do the timing belt. You said you aligned the marks, but that mark could be on the right spot, but the journals whatever were not in the right locations. you understand what i mean?

cylinder 1 is the cylinder right next to the cam gears and cylinder 4 is on the opposite end. (either that or vice versa, anyways the far left and far right cylinders) just remove spark plugs and then make sure the piston is at TDC in those cylinders, then align all the other marks. maybe that could be the problem.

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