Chevrolet 12624550 Cylinder Head (Service Partial)

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Don't try removing the cylinder head until the engine has completely cooled down to avoid distorting the head. Have new head bolts on hand before starting this project. Start by disconnecting the negative battery cable. After letting the engine cool, drain the coolant system completely. Take out the drivebelt and drivebelt tensioner. Next, remove the exhaust manifold and intake manifold. Then you can take off the timing chain. Label all electrical connectors obstructing cylinder head removal and mark each connector for reassembly as necessary. Remove head bolts running in opposite direction of tightening sequence then throw them away one by one. Loosen bolts incrementally by a quarter-turn.Camshafts, rocker arms, and hydraulic lash adjusters if necessary for a full head overhaul should be removed using a prybar at corners of gasket sealing surfaces between head-to-block mating surface avoiding prying in gasket sealing area.Lift on hammer with wood block,to get it going if difficult to lift out.Take care not to damage or scratch gasket sealing surfaces when placing cylinder heads on wood blocks.Remove old-style cylinder head gasket keeping track of its position so that it can be installed properly next time around.The carbon from both mating surfaces on the block and cylinder head is scraped off using a gasket scraper which is followed by wiping with lacquer thinner or acetone.Do not let debris fall into cylinders wrap open areas of motor with rags and use vacuum cleaner to suck any up.Examine engine block and cylinerhead matting services for damages.Straighten up those threaded holes on your block clean them up with tap.Position new gasket over dowels placed in an engine block ensuring that even while installing cylinder heads it will not move.Install new top end bolts starting two steps following manufacturer's procedure.To install camshaft sprocket, attach exhaust manifolsd, install intake plenum etc., just reverse order for remaining installation steps.Reconnect battery, change oil and filter, fill cooling system and start engine making sure that there are no leaks of the coolant or oil.

Remove the battery cable from the car's negative terminal and take at least three days to let the engine cool before draining the coolant. Take out the drivebelt and the drivebelt idler, then remove the exhaust manifold and the intake manifold as well, after which you'll have to disconnect the coolant hose on the cylinder head. Take out the timing chain and the plate attached to it and detach electrical connections from the head of the cylinder that may hinder the process of removal; use adhesive tape to note connections for reconnection. Take out the cylinder head bolts and throw them away, and rattle the bolts with a prescribed sequence. It is advisable to loosen the gasket seal at the corners of the head-to-block mating surface with a pry bar, and lift the cylinder head off the engine with the aid of a wood block and hammer in as many places as you feel some point of resistance. Place the cylinder head with the gasket surfaces on wooden blocks to avoid damaging the sealing surfaces and then remove the old cylinder head gasket and remember the correct way it should be fitted. Make sure the surfaces of the cylinder head and the block to be joined by a gasket are free of carbon and of any kind of residue of the old gasket; use a gasket scraper and the brake system cleaner for that. During repair and reassembly, use shop rags to cover the open areas of the engine to avoid having debris inside the cylinders; use vacuum cleaner to clean the cylinders of any debris which may have fallen into it. The flatness of the mating surfaces of the engine block and cylinder head should also be checked for nicks and deep scratches and in chasing the threaded holes of the cylinder head bolts, a correct size tap should be used. Ensure that this new gasket lies in the dowels of the block which should then be followed by placing the cylinder head on the engine block while avoiding to dislodge the gasket. Place fresh cylinder head bolts and tighten using proper torque indicated and sequence that is prescribed; paint an arrow on each of the main cylinder head bolts that may be further tightened by an additional 155 degrees. Replace the timing chain, exhaust manifold, and intake manifold; the remaining procedures are the reversal of the above actions taken. Crank the battery connection loose and tighten again, replace the engine oil and filter, fill up the cooling system, turn the engine on and search for any of leaks of oil and coolant.

The head must be removed on a cold engine since taking off the head while hot results into warping of the head. First of all, connect the hollow of cable our from negative battery terminal. First of all, it is necessary to wait until the engine becomes cool; then you have to remove the cooling system including the radiator inlet hose. Then, the drivebelt and the drivebelt tensioner should be taken off and, subsequently, the exhaust manifold and the intake manifold. Breaking the timing chain, take off and identify with the help of tape the electrical connectors of the cylinder head that hinder the removal. Screw out the cylinder head bolts untightening each of them once by 1/4 turn and dispose the bolts. Always use pry bar at the corners of the head to block mating surface, do not pry at the gasket sealing area. Remove the final bolts and lift the cylinder head off the engine, if you meet with any resistance than gently tap them off using a wood block and hammer and always place them on wooden blocks so as not to damage the gasket sealing surface. Take off the old cylinder head gasket and keep in mind which way it has to be installed. Mating surfaces of the cylinder head and block before installation should be free of contaminants, clean it with new razor blade-type scraper using lacquer thinner or acetone. The components can be damaged if anything other than a new razor blade is used. In the event that there is oil on the mating surfaces when installation is being carried out, the gasket may not fit well and the result may be leaks. Use shop rags to cover the sectors of the engine that are exposed to airflow to allow easy eviction of the debris that falls into the cylinders using a vacuum cleaner. Inspect the top of what's called the 'engine block' and the underside of the 'cylinder head' for any flaws. Before installing the new gasket, ensure that it fits properly on the dowels of the block; then place the cylinder head nicely over the engine block without shifting the gasket. Fit new cylinder head bolts and torque tighten them to the value stamped on their heads in sequence as recommended. The cylinder head main bolts and the other four bolts of slightly larger diameter at the front side are done in part one and part two respectively while the last part involves tightening . Place a tick mark on each of the major main cylinder head bolts so as to identify those that were tightened an additional 155 degrees. It is used a torque angle method for head bolt tightening and for tightening with high precision a torque angle gauge can be used. Continue to fit the timing chain, exhaust manifold and intake manifold, the rest of the procedure is done in reverse of removal. Last but not the least, the terminals of the battery has to be connected, engine oil and filter has to be changed, cooling system has to be refilled and then the engine is to be turned on and should be observed for any signs of oil or coolant leakage.

Don't try removing the cylinder head until the engine has completely cooled down to avoid distorting the head. Have new head bolts on hand before starting this project. Start by disconnecting the negative battery cable. After letting the engine cool, drain the coolant system completely. Take out the drivebelt and drivebelt tensioner. Next, remove the exhaust manifold and intake manifold. Then you can take off the timing chain. Label all electrical connectors obstructing cylinder head removal and mark each connector for reassembly as necessary. Remove head bolts running in opposite direction of tightening sequence then throw them away one by one. Loosen bolts incrementally by a quarter-turn.Camshafts, rocker arms, and hydraulic lash adjusters if necessary for a full head overhaul should be removed using a prybar at corners of gasket sealing surfaces between head-to-block mating surface avoiding prying in gasket sealing area.Lift on hammer with wood block,to get it going if difficult to lift out.Take care not to damage or scratch gasket sealing surfaces when placing cylinder heads on wood blocks.Remove old-style cylinder head gasket keeping track of its position so that it can be installed properly next time around.The carbon from both mating surfaces on the block and cylinder head is scraped off using a gasket scraper which is followed by wiping with lacquer thinner or acetone.Do not let debris fall into cylinders wrap open areas of motor with rags and use vacuum cleaner to suck any up.Examine engine block and cylinerhead matting services for damages.Straighten up those threaded holes on your block clean them up with tap.Position new gasket over dowels placed in an engine block ensuring that even while installing cylinder heads it will not move.Install new top end bolts starting two steps following manufacturer's procedure.To install camshaft sprocket, attach exhaust manifolsd, install intake plenum etc., just reverse order for remaining installation steps.Reconnect battery, change oil and filter, fill cooling system and start engine making sure that there are no leaks of the coolant or oil.

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.

Use gasket removal solvents and a gasket scraper to eliminate all traces of carbon and old gasket material, followed by wiping with a cloth saturated with brake system cleaner.

Change the engine oil and filter.

Loosen the cylinder head bolts using a breaker bar, turning them 1/4 turn at a time. Use a pry bar at the corners of the cylinder head-to-engine block mating surface to break the gasket seal, avoiding prying in the gasket sealing area.

Disconnect the cable from the negative terminal of the battery and drain the cooling system.

12624550 IS A BARE HEAD PER VIN#