Nissan 11090-JA10A Head Assy-Cylinder,LH

You can Select Your Vehicle to check if 11090-JA10A fits your vehicle.

To do it, first, turn off the coolant and then unbolt the timing chains as well as the sprockets and camshafts to eliminate the cylinder head. Next, locate and take off the intake and exhaust manifold, and the coolant outlet assembly. If front cylinder head is being removed, then disconnect the coolant hose and the coolant inlet having the thermostat assembly. Continue by whipping off the lower and upper oil pans followed by the rear timing chain cover bolts without scratching the cover or the sealing surfaces. It is necessary to pull out the utilized O-rings from the cylinder heads and the engine block, even if only one of the heads has been dismantled: Remove any label and disconnect any part still connected to the cylinder head, next, loosen the cylinder head bolts with increment of the same pattern opposite to that of tightening sequence lastly pull off the cylinder head from the engine block. For installation, be cleaning the mating surfaces with gasket scraper and brake cleaner and stuff the cylinders with the rag to avoid sullying the threads. Look for any signs of damage any where on the mating surfaces and run a chamfer on face of the head bolt holes. Put back the components taken out from the head; place the new gasket and gently place the head on the block without compromising on the position of the gasket. New head bolts must be covered with clean engine oil before fitting and tightened to the predetermined torque value, the rear timing chain cover and bolts should be cleaned and the mating surfaces should then be treated with RTV sealant. New O-rings should be installed and the rear timing chain cover has be fitted and its bolts tightened properly. Install back the camshafts and the timing chains and then follow the steps whereby components were removed in the opposite order. Last but not the least, place the engine in the vehicle, fill in the cooling system and engine oil, join the battery terminals, and switch on the engine with the check for any leaks.

For instance, to gain access to the back of the timing chain cover one has to pull off the upper oil pan from the engine; this in turn calls for hoisting the engine which is placed on supports from the underside by a transmission jack dropping the engine mounts from the frame. After pulling the front suspension crossmember off, lower the engine back to the original position. Start by pulling off the timing chain(s) and sprockets with an intention of not touching the crankshaft from TDC of the compression stroke in cylinder No.1. After that, it is necessary to undo the bolts of the rear timing chain cover in the sequence contrary to the tightening sequence and then to separate the cover from the engine: if the cover is tightly fixed it is possible to use a block of wood and a hammer, or a flexible putt knife to divide the gasket seal but not to damage the sealing surfaces. Proceed to next steps of the removal, and eliminate the intake and exhaust manifolds, camshafts and the lifters; all the other parts must be removed and disconnected from the cylinder head, if they still remain. Rotate the cylinder head bolts a ¼ turn counter to the tightening pattern; you can then raise the cylinder head off the engine block gently with a slight pry bar if needed. Before assembling the cylinder head and block it is important to make sure that the mating surfaces are clean using gasket scraper and cleaning with, lacquer thinner or acetone. Inspect the area on the cylinder heads where the bolts are to mate for any damage, flank the threads of the head bolt holes and measure the stretch in each cylinder head bolt and replace those that have turned out to be stretched. Check the condition of the face of the head gasket and fit all the removed parts back, placing the new cylinder head gasket atop the dowel pins in the block. Remove the head from the block without moving the gasket, lubricate the threads and the bottom of the bolts and make the screws fit in the former positions before fixing them tightly in a gradual manner with a specific force. Gently remove any debris and dirt from the rear timing chain cover and bolts, and apply clean RTV sealant on all the sealing surfaces in the rear timing chain cover, place new O-rings and fit the rear timing cover before closing the nuts and bolts in a correct manner to the exact torque recommended. Lastly, fit in the camshafts, replace the coolant, change the engine oil, replace the oil filter, and crank the engine to check you for oil and coolant leaks.

Stuff the cylinders with clean rags to keep out debris and check for damage on the mating surfaces, addressing any issues as needed.

Install and tighten the new cylinder head bolts following the recommended sequence to the specified torque.

NO CYLINDER IS BARE ,OTHER PARTS NEED TO BE ORDER SEPARATELY.