Nissan 11090-4W015 Head Assy-Cylinder,LH

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Clean and apply sealant to the rear timing chain cover. Install new O-rings in the front of the engine block and in the variable valve timing oil control orifices. Place and tighten the rear timing chain cover, install the camshafts, timing chains, and sprockets, and adjust the valve clearance if necessary.

During installation, gently tap each valve seal into its designated position to the specified depth, exercising caution to avoid damaging the seals or twisting them.

Proceed to remove the camshafts and lifters, followed by the exhaust manifold, and label and remove any remaining components attached to the cylinder head. Loosen the cylinder head bolts in 1/4-turn increments, ensuring they can be removed by hand, and follow the specific loosening sequence. Lift the cylinder head off the engine block, prying it up at a casting protrusion if needed. Remove all external components from the cylinder head for cleaning and inspection.

If a valve binds in the guide and won't pull through, it should be pushed back into the cylinder head and the area around the valve stem keeper groove should be deburred with a fine file or whetstone.

During valve inspection, each valve face should be assessed for even wear, deformities, cracks, pits, and burn marks. The valve stem should also be inspected for scuffs, galling, cracks, and to ensure it is not bent. Additionally, measure the margin width on each valve, and valves with narrower margins than specified should be replaced.

Complete the remaining installation steps in reverse order. Add coolant, change the engine oil and filter, and check for any leaks.