Chevrolet 12624549 Cylinder Head Assembly (Service Partial)

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Ensure the engine is entirely cool before commencing head removal to prevent head warpage. Acquire new head bolts in advance. Begin by disconnecting the negative battery cable. Allow the engine to cool completely, then drain the cooling system. Remove the drivebelt and the drivebelt tensioner. Proceed to remove the exhaust manifold and intake manifold. Next, eliminate the timing chain. Label and disconnect electrical connectors from the cylinder head that may obstruct removal, marking each connector for proper reassembly. Remove the cylinder head bolts and discard them following the reverse of the tightening sequence. Loosen bolts incrementally by a quarter-turn. If a complete head overhaul is required, remove the camshafts, rocker arms, and hydraulic lash adjusters. Employ a prybar at the head-to-block mating surface corners to break the gasket seal, avoiding prying in the gasket sealing area. Lift the cylinder head from the engine, and if resistance is encountered, utilize a wood block and hammer to dislodge it. Place the cylinder head on wood blocks to safeguard the gasket sealing surfaces. Remove the old cylinder head gasket, noting its correct orientation for future installation. For installation, ensure pristine mating surfaces of the cylinder head and block by removing carbon and old gasket material with a gasket scraper, followed by cleaning with lacquer thinner or acetone. Protect open engine areas with shop rags and use a vacuum cleaner to clear any debris that may fall into the cylinders. Inspect the engine block and cylinder head mating surfaces for damage. Employ a tap to clean cylinder head bolt holes. Verify the new gasket is positioned on the block dowels, then carefully place the cylinder head on the block without disturbing the gasket. Install new cylinder head bolts and tighten them following the recommended sequence to the specified torque, using a torque angle gauge for precise tightening. Reassemble the timing chain, exhaust manifold, and intake manifold, completing the remaining installation steps in reverse order. Reconnect the battery, change the engine oil and filter, refill the cooling system, and commence the engine, diligently checking for oil and coolant leaks.