Genuine 2004 Chevrolet Astro Cylinder Head

2004 Chevrolet Astro Parts Questions & Experts Answers

• Q: What steps should be taken to remove and reinstall the Cylinder Head to prevent warpage in V6 engine on 2004 Chevrolet Astro?

  A: Heads should also be set in place when the engine is completely cool so as to avoid head warpage. Start by removing the negative battery terminal then the access drive idler pulleys. On CH or TBI engines, securely unbolt and remove the intake manifold; on CMFI or CSFI engines, remove the upper intake plenum bolted to the intake manifold. Moreover, there he unscrewed the engine cover, jacked up the vehicle safely, and then pulled out the spark plugs and the exhaust manifold. If outfitted, take the A/C compressor off its cradle without having to break the refrigerant connections, and take off the power steering pump cradle from the cylinder head. Cylinder head should be checked to guarantee all brackets or electrical connections are undone. For the right cylinder head, it is required to remove the alternator as well as the other components that would come into contact with it if present. Lifting off the rocker arms requires the removal of the valve covers as well as loosening the rocker arm fulcrum bolts, and removing the pushrods, the later to be stored for reuse. Take a new head gasket and sketch the cylinders as well as the bolt placement on cardboard, after which the holes are made on the gasket. Grease the new head bolts with the anti-seize and in a manner opposite to the tightening pattern, turn 1/4th turn at a time and store them in the cardboard holder. Pull up the heads slightly off of the engine, it's recommended this be done with a block of wood and a hammer and then it should be kept on blocks of wood so that they do not get ruined. Refitting the cylinder heads onto the block, make certain that the surfaces are clean, by scraping them with a gasket scraper, then wiping them with lacquer thinner or acetone. Inspect the mating surfaces for signs of damage and repair or replace as required. The threads in the head bolt holes should be chased and the bolts themselves cleaned in order to receive accurate torque readings. Align the new gaskets over the dowel pins of the block, and it is necessary to apply sealant to the steel gaskets, if necessary. Lay the heads gently down on the block without shifting the gaskets, apply a non-freezing thread compound to the bolts then thread them in the original holes, and torque the bolts as suggested. The rest of the installation steps are in the sequence of the reversal of the removal process. , but for the last one use the new engine oil and filter, then switch on the engine and look for the signs of oil and water leaking.