GM 90537298 Sprocket,Water Pump

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To remove and inspect the timing system components, start by disconnecting the negative battery terminal and removing the spark plugs, valve cover, engine oil, and drivebelt. Remove the drivebelt tensioner and the engine front cover, then set the No. 1 piston at TDC by aligning the marks on the crankshaft sprocket, intake camshaft sprocket, and exhaust camshaft sprocket. Remove the timing chain tensioner, upper timing chain guide, and adjustable timing chain guide. Next, remove the exhaust camshaft sprocket bolt and the intake camshaft sprocket bolt, discarding them and installing new bolts for reassembly. Carefully remove the timing chain through the top of the cylinder head, taking caution not to rotate the camshafts or crankshaft. Remove the timing chain drive sprocket and the timing chain oiling nozzle from the engine block. Inspect all components for wear or damage and replace any questionable parts. For installation, ensure the crankshaft sprocket's timing mark is correctly positioned and install the intake camshaft sprocket with a new bolt. Lower the timing chain into place, making sure the bright-colored link aligns with the INT designation on the intake camshaft sprocket. Engage the plated link on the chain with the crankshaft sprocket timing mark and proceed to install the adjustable timing chain guide, exhaust camshaft sprocket with a new bolt, fixed timing chain guide, and upper timing chain guide. Tighten all bolts to their respective torque specifications. Compress the timing chain tensioner following the specified steps and measurements, then install it. Apply RTV sealant to the timing chain guide access plug threads and install it. Finally, reassemble the valve cover, engine front cover, and other components in reverse order, ensuring to refill the crankcase with oil, reconnect the battery, and check for any leaks during engine operation. It's crucial to handle this procedure with expertise, as any errors can result in severe engine damage. Double-check all work and ensure the timing marks are correctly aligned before attempting to start the engine.