With a timing light? No. But the first time I installed the new timing belt it scared me because I didn't see the white lines (on the Nissan OEM timing belt) line up with the back covers (exhaust and intake cams) and the notch on the oil pump, after turning it with the 27 mm socket wrench. But the dimples on all 4 cams and the one on the crank sprocket always line up....so I'm not concerned.