Question 1

What steps are involved in removing and reinstalling the upper oil pan and cylinder head in V6 engine on Nissan Altima?

Accepted Answer

This procedure involves dealing with the upper oil pan and is only possible if the engine is extracted from the car for the automatic transmission cars as the manual ones also need the engine pulling out. Initially, pull the engine and disconnect it from the transmission then remove timing chains and the sprockets, in such a way that crankshaft is positioned on TDC of compression stroke on No 1 cylinder. After that, remove camshafts, lower intake manifold, and coolant outlet and; remove the rear timing chain cover bolts in the opposite sequence that was used when tightening them. Remove the rear timing cover by loosening it with a block of wood and hammer and do not use pry bar on the cover/cylinder head interface. O-rings have to be returned from the cylinder heads and engine block and the IVT valves should be also returned. Removal of the remaining labels and any other parts connected to the cylinder head, and the loosening of the cylinder head bolts for 1/4-turn and finally removing the cylinder head by hand from the bottom upwards in a reverse order to minimize warping. Remove the cylinder head of the engine block by lifting it and if it is rigid, apply some force to loosen it and pull it off, also, take out all the exterior fixtures of the engine for cleaning and checking. Make sure that the mating surfaces of the cylinder head and block contain no traces of the old gasket material before the installation; for this, a gasket scraper and the brake cleaner may be useful. On the cylinders, clean with rags and ensure that there are no debris that could hinder the functioning of the cylinders and also check for any kind of damage on the mating surfaces and if there is, get a competent person to repair it. Sweep the threads in the head bolt holes and blow out the debries that might be still remaining with the compressed air. Ensure that cylinder head is not warped by placing a straight edge on it, also check on the head gasket and the manifold to see that they are in good condition. Replace the screws/bolts that were removed from the head, align the new cylinder head gasket over dowel pins and then locate the head on the block properly. Pour some clean engine oil on the threads and washer of the new cylinder head bolts then, tighten them in the correct sequence with the required torque. Remove the old gasket and apply clean rags to dry the and clean the cleaning the rear timing chain cover and bolts the seating surfaces of the cover and the block apply the RTV sealant to these surfaces slip the O-rings into place and put the rear timing chain cover and tighten the bolts down to the prescribed torque specification. Replace the camshafts and timing chains and do the reverse procedure of the removal steps above. Lastly, raise the engine back into the car, add coolant to the cooling system and oil to the engine and fit a new oil filter, and connect the battery then do re-learns where necessary and start the car, check for oil leakages and also for the coolant leakage if any.

Question 2

How to remove and reinstall a cylinder head on 2.4L four cylinder Nissan Frontier?

Accepted Answer

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.

Question 3

How to remove and install a cylinder head on 3.5L V6 Nissan Pathfinder?

Accepted Answer

Be wary that the engine must be completely cool before one can begin this procedure. In order to remove the coolant pipe which is attaching to the back of both cylinder heads, it will be necessary to take out the engine from the vehicle. REMOVAL: Take off the timing chain(s) and sprockets. Reverse order of removal should apply here by removing bolts at rear timing chain cover. The rear timing cover separates from the engine. Remove the lower intake manifold and exhaust manifolds. Tackles employ of camshafts and lifters in cylinder head. Identify each part left linked with cylinder heads prior to their removals from them as well. Unscrew bolts holding down cylinder heads in quarter-turns until they can easily come out by your hand only. Take off cylinder head from engine block. Take away all exterior parts that are on top of your head. INSTALLATION: Ensure cleanliness of block-cylinder head's joint surfaces. Employ a carbon scraper to eliminate all carbon and old gasket residues. Inspect mating surfaces on both the blocks and heads for any form of damage that they might have incurred during installation or handling process (Damaged threads in bolt holes must be cleaned up with taps). Use pair of calipers for measuring each cylinder head bolt so as to make sure whether it has been stretched over time or not (Ensure flatness over entire length). Put together such components that were removed earlier from a head, for example, camshafts, valves, valve springs, etc. Put new cylinder head gaskets over dowels on block completely covering these pins without displacing them at all (Set it down carefully upon gasket without moving it). Create a small amount of oil using clean engine oil on hardened washers besides its thread for every single head bolt which is supposed to be fitted into original locations; then tighten all bolts by your fingers alone (Where required, use step-tightening method in which you keep tightening bolts until they reach specified torque figures). In case of old sealant, it should be removed from rear timing chain cover and replaced with a bead of ATV sealant. For example, one can install new O-rings on the front side of engine block or cylinder head in variable valve timing oil control orifices. Place the rear timing chain cover on top of dowels located within holes that are drilled into engine and then tighten these bolts using a specific torque value. Install camshafts together with their individual timing chains and sprockets. If necessary adjust valves to bring them to required specifications. Put an engine back inside your car. Fill up cooling system and change the motor oil plus filter. Turn it on for checking whether there are any leaks related to oil or coolant flow occurring at this moment (Watch for coolant leaks, especially from engine block's rear area near thermostat housing).

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