Nissan 11040-JA00A Head Assy-Cylinder

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Disconnect the multiselector/fuel rail pressure signal adaptor quick-connect and remove the snap ring, then have the engine at TDC compression for cylinder no. 1. Remove the cooling system fluid and take out the timing chain; the camshafts and the exhaust and intake manifolds. Anyone remaining items connected to the cylinder head should be removed and labeled appropriately-coolant fittings/tubes, cables, hoses, or wiring harnesses inclusive. Attach a breaker bar to the appropriate-size hex bit in cylinder head bolts and turn them counterclockwisely in 1/4 turn until they can be removed by hand; apply the reverse of the above process to avoid warping or cracking of cylinder head. Raise up the cylinder head off of the engine block with, perhaps, some force if it is tightly fixed in place. Take out all the bolts from the C/cylinder head so that it is externally clean and dismantled for inspection. The surfaces of the cylinder head and the block which are required to mate have to be free from dirt before they are placed together. Gasket scraper has to be used to scrape off the carbon and the old the gasket material while the surfaces to be mated have to be wiped with the lacquer thinner or acetone, making sure there is no oil that may hinder proper sealing of the gasket. Pack the cylinders with clean shop rags to reduce the chance of bringing in new material so use a vacuum cleaner to clean all the cylinders. Inspect all the flat surfaces of the block and the cylinder head for any signs of nicks, scratch marks or the like or use a fine file if there is mild or use the machining service if there is severe damage. You should change the tap to one that will chase the threads in the cylinder head bolt holes, and blow off the holes with compressed air. When the gasket surface of the cylinder head is cleaned, ensure that it is warping and look at the cylinder head gasket, intake, and exhaust manifold. Bolt any components that were removed from the Cylinder head; align any new cylinder head gasket over the dowel pin in the block; and gently lay the Cylinder head on the block over the gasket. Before tightening a new cylinder head, bolts must be lubricated with a clean engine oil where the threads and the hardened washers are passed through the chamfered side of the washers facing the head of the bolts. Replace the new cylinder head bolts and correctly tighten them in the advised sequence to the right torque. The lifters have to be put into position together with the camshafts, and the timing chain has to go on next the valve clearances have to be checked. The rest of the installation procedure is, of course, the exact opposite to the removal process. Replace the coolant that has lost opacity, replace the oil filter, and put some oil in the engine. Finally, connect the battery , and those of you who are interested in some of the re-learn procedures, turn the Ignition switch on.

Position the new cylinder head gasket over the dowel pins in the block and carefully set the cylinder head on the block.

Ensure the mating surfaces of the cylinder head and block are clean before installation, using a gasket scraper and brake cleaner to remove old gasket material.

Lift the cylinder head off the engine block, prying carefully if it is stuck, and remove all external components for thorough cleaning and inspection.