There are special tools which are required for this procedure; therefore, check it carefully before starting work. Firstly, disconnect the negative battery cable, taking precautions if the vehicle is equipped with the Delco Loc II audio system. Secondly, remove the coolant reservoir and engine lifting bracket at the drivebelt end. Next, remove vibration damper, upper and lower timing chain cover fasteners and detach the cover and gaskets from the housing. Slide oil slinger off crankshaft and temporarily reinstall vibration damper bolt for later use. Then rotate crankshaft clockwise to align camshaft sprocket's timing pin holes with housing holes by inserting 8 millimeters pins or bolts for alignment. Make sure that crankshaft sprocket mark lines up with engine block mark having keyway pointing up. Following removing timing chain guides, take away timing chain tensioner sleeve and spring in model through 1991 together with tensioner shoe after that. In addition, retract tensioner shoe using a wire on 1992 and later models. Then remove tensioner assembly followed by timing chain from sprockets beginning at exhaust camshaft sprocket. Remove camshaft sprockets as necessary ensuring proper identification using sealant on camshaft sprocket bolt threads. Also check alignment of camshaft and crankshaft sprockets to make sure correct valve timing.Slip timing chain over the sprockets; release intake camshaft alignment dowel pin; check timing marks.Adjust chain if needed.Install chain housing-to-block stud and tighten.Reset timing chain tensioner assembly to its "zero" position.Reinstall tensioner shoe, spring and sleeve.Remove alignment pins then rotate crankshaft clockwise two full turns aligning crankshaft timing mark with engine block mark and temporarily reinstalling eight millimeter alignment pins.Lastly, install remaining components in reverse order; check fluid levels; start engine and inspect for proper operation and leaks.
