Remove the left valve cover and loosen the number 5 cylinder exhaust valve rocker arm, rotating it aside. Mount a dial indicator on the end of the pushrod to detect valve lifter movement. Turn the crankshaft clockwise until the number 1 piston is at Top Dead Center, ensuring the damper timing mark points to TDC on the timing degree indicator, which will take up slack on the right side of the chain. Zero the dial indicator and slowly turn the crankshaft counterclockwise until the slightest movement is seen on the dial indicator, checking how far the damper TDC timing mark has moved away from the pointer. If the reading on the timing indicator exceeds 6 degrees, replace the timing chain and sprockets. Next, turn the crankshaft clockwise until the number one piston is at Top Dead Center, disconnect the negative cable at the battery, and remove the timing chain cover. Unbolt the camshaft sprocket, ensuring the engine does not turn during bolt removal, and carefully remove the sprocket with the chain still attached. Pry the crankshaft sprocket off, taking care not to lose the small crankshaft key, and check the timing chain and sprockets for visible wear and damage, replacing them as a set if necessary. For installation, slide both sprockets and the chain onto the camshaft and crankshaft with the timing marks aligned, tapping the crankshaft sprocket into place with a brass drift and hammer. Install the camshaft bolt and washer, tightening the bolts to the specified torque, ensuring the camshaft bolt's drilled oil passage is open before installation, and do not substitute any other type of bolt. Apply oil to the timing chain and sprockets, then install the timing chain cover and the remaining components removed for installation.
