Nissan 11040-1W200 Head Assy-Cylinder

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Measure each cylinder head bolt for stretching and check the head for warpage. Install components removed from the head, position the new gasket, set the head on the block carefully, and apply oil to the bolts' threads. Install and tighten bolts in the correct sequence to the specified torque.

Before commencing the reassembly of the cylinder head, it is essential to ensure that the cylinder head is thoroughly clean, regardless of whether it underwent valve servicing at an automotive repair shop.

If the valve binds, the area around the valve stem lock groove should be deburred.

Loosen the cylinder head bolts.

The lifters on 3.3L engines should not be laid on their side or upside down. If they need to be laid on their side, they should be submerged in a pan of clean engine oil until reassembly.

If cracks are identified during the inspection of the cylinder head, it is recommended to consult with an automotive machine shop for possible repair options. If repair is unfeasible, obtaining a new cylinder head is advised.

The hydraulic valve lifters, lifter guide assembly, and rocker arms can now be installed on each cylinder head, ensuring the valve lifters are placed in their original lifter bores and held in place with rubber bands during the lifter guide assembly installation.

Position the new gaskets over the dowel pins in the engine block, carefully place the heads on the engine block without disturbing the gaskets, and lightly oil the threads of the new cylinder head bolts before installing them in the proper locations.

Check valve springs for wear and free length, ensuring they are suitable for reuse, and assess spring retainers and valve stem locks for wear and cracks, replacing any questionable parts.

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.

After removing the valves and related components, the cylinder head should be thoroughly cleaned and inspected.

Start by relieving the fuel system pressure and disconnecting the battery. Drain the cooling system and remove the spark plug wires, distributor cap, and spark plug wires as an assembly.

Before proceeding, ensure the engine is completely cool. Note that the cylinder head can be removed with the intake manifold still attached, and the manifold can be removed later on the workbench. To initiate removal, disconnect the negative battery cable, remove the upper timing chain, and insert a timing chain tensioner wedge through the lower timing chain cover's opening, ensuring it's wedged between the narrowest section of the lower timing chain.

For 3.3L engines, a seal installation tool is only necessary for the intake valve guide, while exhaust valve seals should be slid into place by hand.

When inspecting valve springs, check for wear on their ends and pits. Measurements should be compared to specified free lengths. Tension checks should be carried out by an automotive machine shop before determining their suitability for use in an engine rebuild.

Ensure that the engine is completely cool before beginning any removal procedures.

Remove the timing chain(s) and sprockets, then proceed to remove the rear timing chain cover bolts in reverse order. Detach the rear timing cover from the engine.

After properly placing the valve spring seat(s), manually install the valve seals over the valve tips, using the valve stems as guides.

The lifters on 3.3L engines should not be laid on their side or upside down. If they need to be laid on their side, they should be submerged in a pan of clean engine oil until reassembly.

Lift the cylinder head off the engine block, being careful not to damage it.

Valve stem-to-guide clearance should be measured with the appropriate tools. If it exceeds specific limits, consider replacing valve guides. When in doubt, consult an automotive machine shop for further evaluation.

Install the removed components, position the new cylinder head gasket, and apply clean engine oil to the cylinder head bolt threads and hardened washers before tightening the bolts in the recommended sequence. Reinstall the lifters, shims, and camshafts, adjusting valve clearances if necessary due to prior machine work on the cylinder head.