Pontiac 14102671 Chain Assembly, Timing

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When replacing the timing chain and gears on Oldsmobile 263 Diesel Engines, follow these steps: Remove the front timing chain cover and valve covers. Evenly loosen all rocker arm pivot bolts to create lash between the rocker arms and valves. Remove the crankshaft oil slinger and the camshaft sprocket bolt washer. Remove the timing chain, camshaft, and crankshaft sprockets. If the crankshaft sprocket is tightly fitted on the crankshaft, use an appropriate puller to remove it. To install, reposition the crankshaft sprocket, ensuring the keyway is perfectly aligned. Rotate the crankshaft gear's timing mark to face the center of the camshaft. Mount the timing gear over the camshaft gear and ensure the timing marks align closely between the shaft centers. Rotate the camshaft to align it with the new gear. Install the fuel pump eccentric with the flat side towards the rear. Drive the key in until it bottoms and reinstall the oil slinger. Complete the remaining installation steps in reverse order. Bleed down the valve lifters and check injection timing after completing the process.

Slip the timing chain over the sprockets, release the intake camshaft alignment dowel pin, and check timing marks. Adjust the chain if needed.

If the chain and sprockets must be replaced, the procedure involves temporarily installing the crankshaft pulley hub and bolt, aligning the timing marks on the crankshaft and camshaft sprockets, using a drill bit to retain the tensioner in the retracted position, prying off the camshaft sprocket, and then installing the new chain and sprockets.

Timing chains and sprockets should be replaced in sets.