Buick 24577247 Chain,Camshaft Timing

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The timing chain should be replaced with a new one if the engine has high mileage, the chain has visible damage, or the total freeplay midway between the sprockets exceeds one inch. Failure to replace a worn timing chain may result in erratic engine performance, loss of power, and decreased fuel mileage. Loose chains can "jump" timing. In the worst case, chain "jumping" or breakage will result in severe engine damage. Remove the timing chain cover. Temporarily install the vibration damper bolt and turn the crankshaft with the bolt to align the timing marks on the crankshaft and camshaft sprockets. Both should be at the top (12 o'clock position). Remove the camshaft sprocket bolts. Do not turn the camshaft in the process. Use two large screwdrivers to carefully pry the camshaft sprocket off the camshaft dowel pin. Slip the timing chain and camshaft sprocket off the engine. Timing chains and sprockets should be replaced in sets. If you intend to install a new timing chain, remove the crankshaft sprocket with a puller and install a new one. Be sure to align the key in the crankshaft with the keyway in the sprocket during installation. Inspect the timing chain dampener (guide) for cracks and wear and replace it if necessary. The dampener is held to the engine block by two bolts. Clean the timing chain and sprockets with solvent and dry them with compressed air(if available). Inspect the components for wear and damage. Look for teeth that are deformed, chipped, pitted, and cracked. Turn the camshaft to position the dowel pin at 9 o'clock, if necessary. Mesh the timing chain with the camshaft sprocket, then engage it with the crankshaft sprocket. The timing marks should be aligned. Install the camshaft sprocket bolts and tighten them. Lubricate the chain and sprocket with clean engine oil. Install the timing chain cover. The remaining installation steps are the reverse of removal.

Special tools are necessary for this procedure, so carefully review it before commencing work. To start, disconnect the negative battery cable, taking precautions if the vehicle is equipped with the Delco Loc II audio system. Remove the coolant reservoir and the engine lifting bracket at the drivebelt end. Proceed to remove the vibration damper, upper and lower timing chain cover fasteners, and detach the cover and gaskets from the housing. Slide the oil slinger off the crankshaft and temporarily reinstall the vibration damper bolt for later use. Rotate the crankshaft clockwise to align the camshaft sprocket's timing pin holes with the housing holes, inserting 8 mm pins or bolts for alignment. Ensure the crankshaft sprocket mark lines up with the engine block mark, with the keyway pointing up. Remove the timing chain guides, and for models through 1991, detach the timing chain tensioner sleeve and spring, followed by the tensioner shoe. On 1992 and later models, retract the tensioner shoe using a wire. Remove the tensioner assembly and then the timing chain from the sprockets, starting at the exhaust camshaft sprocket. If necessary, remove the camshaft sprockets, ensuring proper identification and using sealant on the camshaft sprocket bolt threads. Verify the alignment of camshaft and crankshaft sprockets for correct valve timing. Slip the timing chain over the sprockets, release the intake camshaft alignment dowel pin, and check timing marks. Adjust the chain if needed. Install the chain housing-to-block stud and tighten it. Reset the timing chain tensioner assembly to its "zero" position. Reinstall the tensioner shoe, spring, and sleeve. Remove the alignment pins and rotate the crankshaft clockwise two full turns, aligning the crankshaft timing mark with the engine block mark and temporarily reinstalling the 8 mm alignment pins. Finally, reinstall the remaining components in reverse order, check fluid levels, start the engine, and inspect for proper operation and leaks.

Disconnect the cable from the negative battery terminal. Caution: On models equipped with the Delco Loc II audio system, be sure the lockout feature is turned off before performing any procedure which requires disconnecting the battery. Remove the crankshaft pulley. Remove the timing chain cover. Before removing the chain and sprockets, visually inspect the teeth on the sprockets for wear and the chain for excessive slack. Also check the condition of the timing chain tensioner. If either or both sprockets show any signs of wear, they should be replaced with new ones. Failure to replace a worn timing chain may result in erratic engine performance, loss of power, and lowered fuel mileage. If any one component requires replacement, all related components, including the tensioner, should be replaced as well. If the chain and sprockets must be replaced, proceed as follows. Temporarily install the crankshaft pulley hub and bolt. Rotate the crankshaft until the timing marks on the crankshaft and camshaft sprockets align with the tabs on the chain tensioner housing. Push the spring back on the timing chain tensioner and insert an appropriate size drill bit into the hole to retain it in the retracted position. Use a prybar against two bolts in the crankshaft balancer hub to keep the engine from turning while removing the camshaft bolt. Use two large screwdrivers to carefully pry the camshaft sprocket off the camshaft dowel pin, and remove the sprocket and chain. Mesh the timing chain with the camshaft sprocket, then engage it with the crankshaft sprocket. Install the camshaft sprocket bolt and tighten it. Press the timing chain against the tensioner, pull out the pin retaining the spring and release the tensioner. Lubricate the chain and sprocket with clean engine oil. Rotate the engine through two complete revolutions and check the alignment of the timing marks again. Install the timing chain cover, using a new gasket and tighten the cover bolts. Install the oil pan. The remaining installation steps are the reverse of removal.

To remove and install the Timing Cover, first, disconnect the negative battery cable. For removal, remove the upper and lower fan shrouds, drive belt, cooling fan, and water pump. Position the number four piston at TDC on the compression stroke, remove the drive belt pulley and the crankshaft damper. Be sure to remove the crankshaft position sensor and the wiring harness nut if applicable. Loosen the front oil pan nuts, then proceed to remove the cover bolts, separating the Timing Cover from the block, breaking the gasket seal if necessary. Note that for some engines, the front cover may be made of composite material and should be replaced rather than resealed. Remove the crankshaft position sensor reluctor ring just inside the front cover, and remove the camshaft sprocket and chain assembly. When installing, use a gasket scraper to remove old gasket material and sealant, clean the cover and block sealing surfaces with lacquer thinner or acetone, and check the cover flange for distortion. Ensure proper alignment of the crankshaft sprocket with the Woodruff key and the balance shaft gears. Lubricate the chain with clean engine oil, apply Loctite to the camshaft sprocket bolt threads, and install and tighten them. Check the oil pan-to-block joints and apply RTV sealant to the U-shaped channel on the bottom of the cover. Apply a thin layer of RTV sealant to both sides of the new gasket and position it on the engine block, securing it with dowel pins. Install the Timing Cover and tighten the bolts, considering whether the oil pan needs to be removed or pried down for access. Finally, lubricate the oil seal contact surface of the vibration damper hub with moly-base grease or clean engine oil, install the damper on the crankshaft, and follow the remaining installation steps, including using a new O-ring for the crankshaft position sensor.

The upper fan shroud, drive belt, fan/clutch assembly, water pump pulley, crankshaft pulley, and hub.

To remove the cover, start by disconnecting the negative battery cable. Then, remove the upper fan shroud, drive belt, fan/clutch assembly, water pump pulley, crankshaft pulley, and hub. Next, remove the drive belt tensioner bracket and the Timing Cover-to-engine block bolts. Use a gasket scraper to remove any old gasket material and clean the sealing surfaces. To remove the timing chain, temporarily install the crankshaft pulley hub and bolt, align the timing marks on the crankshaft and camshaft sprockets, push back the timing chain tensioner and insert a pin to retain it, use a prybar to hold the engine while removing the camshaft bolt, and carefully pry off the camshaft sprocket. Inspect the timing chain and sprockets for wear and damage. If necessary, replace them. To install the new timing chain, mesh it with the camshaft sprocket and engage it with the crankshaft sprocket, align the timing marks, install and tighten the camshaft sprocket bolt, release the tensioner, lubricate the chain and sprocket, rotate the engine to check the alignment of the timing marks, apply RTV sealant to the oil pan sealing surface, and finally, install the Timing Cover using a new rubber seal.