Chevrolet 10144121 Sprocket,Camshaft

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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.

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.

After removing the front cover, it's recommended to remove the crankshaft position sensor reluctor ring if applicable. Measuring the timing chain's free play is important, and if it exceeds 5/8 inch, replacement is recommended alongside the gears. The camshaft sprocket and chain are removed as a unit, with proper alignment being crucial.

Most engines use a large bolt threaded into the crankshaft's nose to secure the vibration damper. It should be removed with a puller that exerts force solely on the damper hub to avoid damage.

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.

During installation, lubricate the chain with clean engine oil and apply Loctite to the camshaft sprocket bolt threads. Apply RTV sealant to the U-shaped channel on the bottom of the cover and a thin layer of RTV sealant to both sides of the new gasket.

After installing the timing chain cover, 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.

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.