GMC 14102670 Chain Assembly, Timing

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To replace the timing chain on Oldsmobile 307, 350, and 403 engines, follow these steps: Remove the timing case cover and camshaft gear. Remove the fuel pump operating cam bolted to the front of the camshaft sprocket. Remove the oil slinger, timing chain, and camshaft sprocket. If the crankshaft sprocket needs replacement, remove it as well, ensuring to remove the crankshaft key before using a puller. To install, reinstall the crankshaft sprocket, aligning the keyway perfectly. Rotate the timing mark on the crankshaft gear to point toward the center of the camshaft. Place the timing gear over the camshaft gear and align the timing marks as closely as possible between the shaft centers. Rotate the camshaft to align the shaft with the new gear. Install the fuel pump eccentric with the flat side facing the rear. Drive the key in with a hammer until it bottoms and reinstall the oil slinger.