Nissan 11040-F4500 Cylinder Head Assembly

Remember to do a thorough cleaning of the cylinder head before starting reassembly regardless of whether it did or didn't go through valve servicing at an auto repair place. In addition, if it had external valve servicing done, the valves and related components should be in place already since the reassembly will start now. Afterward, smear some light oil on the stems and then put valve spring seat(s) in their right positions on the cylinder head. One needs to realize that there is a difference between old 3.3L engines which have inner and outer valve spring seats and the 2.4L, 3.5L, and new 3.3L engines with just a single valve spring seat. For older 3.3L engines, it is advisable to install the outer valve spring seat first followed by the inner one.Once fitted as required manual installation of valve seals over the tips using stems as guides then gently hit each seal down into its marked position at certain depth is performed.The assembler must be cautious not to bend or twist seals during installation because improper sealing on stems can result.For intake valves in 3.3L engines only, an installation tool is needed while exhaust valves normally have to have their O-rings slid into place.Slide valves onto cylinder heads then use a compressor tool to load springs retainers and locks onto them.Notably, inner and outer valve springs are used for 3.3L engines while single valve springs are applied in 2.4L and 3.5L engines.It is always important that one inserts the outer valve spring into the inner one when positioning these springs together on a 3.3 L engine so that paint marks or end of outer coil more closely wound will be closer to cylinder head.Always return old cylinder head parts back where they were taken from originally saved locations.

Don't forget that the engine should be cold. You can remove the cylinder head with the intake manifold still attached, and then remove the manifold on a workbench. Begin by disconnecting the negative battery cable, removing the upper timing chain, and inserting a wedge for timing chain tensioner down through the opening in lower timing chain cover, making sure it is wedged between the narrowest part of the lower timing chain. Slowly mark on the lower timing chain and idler sprocket, then unscrew idler sprocket bolt but ensure that idler gear and lower timing chain are still engaged and lying over timing chain wedge. Next thing is to take off lifters and camshafts including exhaust manifold as well as label or pull off any other remaining components that are attached onto cylinder head. The loosening sequence has to be according to specific instructions such that cylinder head bolts are loosened at 1/4 turns until they can be taken out by hand. Lift up the cylinder head from the engine block when necessary using a pry bar at a casting protrusion. All external components must be removed from cylinder heads before they are cleaned and inspected for cracks and warpage. It is important to clean all surfaces where cylinder head meets block so as to ensure there is no damage left unattended to. Clean out all holes in threads of cylinder head bolt with a thread chaser thoroughly. Cylinder heads must also be checked for cracks, warpage in intake manifolds involved in this process includes intake & exhaust manifolds. Replace original components, position new cylinder head gasket correctly on it, apply clean engine oil on bolt threads of cylinder heads together with hardened washers before tightening them in required pattern in order to prevent leaking during reinstallation. Put back lifters, shims and camshafts but if necessary whereby they have been refaced on cylinder's machined top surface you will have to set valve clearances. Check that the idler gear/idler shaft bolt aligns with reference marks and remove timing chain wedge. Cover upper timing chain and upper sealing strip, then do installation steps in reverse order for lower timing chain and accessory drive system. Lastly, fill the cooling system refill with coolant oil and change the engine oil as well as filter before putting engine to work and check for leaks.

Remember to do a thorough cleaning of the cylinder head before starting reassembly regardless of whether it did or didn't go through valve servicing at an auto repair place. In addition, if it had external valve servicing done, the valves and related components should be in place already since the reassembly will start now. Afterward, smear some light oil on the stems and then put valve spring seat(s) in their right positions on the cylinder head. One needs to realize that there is a difference between old 3.3L engines which have inner and outer valve spring seats and the 2.4L, 3.5L, and new 3.3L engines with just a single valve spring seat. For older 3.3L engines, it is advisable to install the outer valve spring seat first followed by the inner one.Once fitted as required manual installation of valve seals over the tips using stems as guides then gently hit each seal down into its marked position at certain depth is performed.The assembler must be cautious not to bend or twist seals during installation because improper sealing on stems can result.For intake valves in 3.3L engines only, an installation tool is needed while exhaust valves normally have to have their O-rings slid into place.Slide valves onto cylinder heads then use a compressor tool to load springs retainers and locks onto them.Notably, inner and outer valve springs are used for 3.3L engines while single valve springs are applied in 2.4L and 3.5L engines.It is always important that one inserts the outer valve spring into the inner one when positioning these springs together on a 3.3 L engine so that paint marks or end of outer coil more closely wound will be closer to cylinder head.Always return old cylinder head parts back where they were taken from originally saved locations.