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It is necessary to loosen, but not remove, the 24mm bolts that attach the sprockets to the cams before cranking the engine to its TDC (top dead center) mark. Placing an adjustable open-end wrench on one of the cam's lobe will keep the cam from moving while you loosen the bolts. To ensure the timing does not fall off its original mark, use two wire ties to lock the chain to each sprocket.
SR20 Bumpstick Boogie

 It is necessary to loosen, but not remove, the 24mm bolts that attach the sprockets to the cams before cranking the engine to its TDC (top dead center) mark. Placing an adjustable open-end wrench on one of the cam's lobe will keep the cam from moving while you loosen the bolts. To ensure the timing does not fall off its original mark, use two wire ties to lock the chain to each sprocket.  View Related Article

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