Nissan 13207-3Z000 Seal-Oil,Valve

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Broken valve springs and defective valve stem seals can be replaced without removing the cylinder heads, typically requiring two special tools and a compressed air source. Begin by removing the valve cover(s) and the camshafts and lifters from the affected cylinder head. Remove the spark plug from the cylinder with the defective component, and if replacing all valve stem seals, remove all spark plugs. Turn the crankshaft until the piston in the affected cylinder is at Top Dead Center on the compression stroke, working on one cylinder at a time following the firing order. Thread a long adapter into the spark plug hole and connect an air hose from a compressed air source, using a long spark plug adapter with a length of hose attached. Apply compressed air to the cylinder and stuff shop rags into the cylinder head holes around the valves to prevent parts and tools from falling into the engine. Use a valve spring compressor to compress the spring, releasing the valve stem keepers and lifting them out with a magnet or needle-nose pliers. Remove the spring retainer and valve spring, then the valve stem seal. Wrap a rubber band or tape around the top of the valve stem to prevent it from falling into the combustion chamber, then release the air pressure. Inspect the valve stem for damage, ensuring it doesn't bind in the guide; if it does, the cylinder head will need to be removed for repair. Reapply air pressure to retain the valve in the closed position, then remove the tape or rubber band. Lubricate the valve stems with engine oil and install new valve stem seals, using a special tool or a deep socket and hammer to seat them. Install the valve spring over the valve with the more closely-wound coils and paint mark toward the cylinder head, followed by the valve spring retainer. Compress the valve springs and position the keepers in the groove, applying a small dab of grease to hold them in place. Remove the pressure from the spring tool and ensure the keepers are seated, then disconnect the air hose and remove the adapter from the spark plug hole. Reinstall the camshaft and lifters, then the timing chain, followed by the valve covers. Finally, install the spark plug(s), ignition coils, and the upper and lower intake plenum as necessary, start the engine, and check for oil leaks and unusual sounds from the valve cover area.

Valve springs, in particular, those which are broken, and valve stem seals, which are faulty, can be replaced during the course of avoiding the removal of the cylinder head; this requires generally two special tools and a source of compressed air. Waiting for the cylinder head on a stable bench, utilize the big and large clamp type of valve spring compressor and adapter where the bottom part of the tool should be resting beneath the working valve and to compress accordingly until the keepers can be easily removed with the help of magnet or small pliers. Extract the valve spring along with the retainer, to eliminate it, undo the old valve stem oil seal using pliers. Run the valve stem in the guide and using your fingers see whether it wobbles; this is an indication that the valve is bent. Rock the valve back and forth in the guide and look for binding; if there is binding then the valve maybe bent or the guide may be damaged and this means further procedures of cylinder head repair. Apply a coat of engine oil on the valve stem and then fasten the valve spool into the cylinder head, placing a piece of plastic container seal guard on the valve stem to avoid tearing of the new seal. If there is no seal protector, wind the cellulose tape around the valve stem of the faucet . With the multi-purpose grease provided, immerse the new seal and push it downwards over the valve stem; the protector or tape should be withdrawn when the seal hits the guide. Place the new seal into the deep socket appropriate for the diameter and gently tap it down to the top of the valve guide, then put the spring into proper place over the valve with the retainer. Next, co sam Main spring of the valve and its retainer; use the keepers to fit the spring in the grooves and if it is needed a small amount of the grease must be applied in order for the keepers to be stayed in place and properly fixed; the keepers should be inserted with the needle-nose pliers. Release pressure with the use of spring tool while confirming that the keepers are in place. Replace the lifters and camshafts, and finish the procedure in a sequence that is the reversal of that implemented during removal. Switch on the engine and observe its performance and the extent of oil leakage and strange noises originating from the region of the valve cover.

Broken valve springs and defective valve stem seals can be replaced without removing the cylinder heads, typically requiring two special tools and a compressed air source. Begin by removing the valve cover(s) and the camshafts and lifters from the affected cylinder head. Remove the spark plug from the cylinder with the defective component, and if replacing all valve stem seals, remove all spark plugs. Turn the crankshaft until the piston in the affected cylinder is at Top Dead Center on the compression stroke, working on one cylinder at a time following the firing order. Thread a long adapter into the spark plug hole and connect an air hose from a compressed air source, using a long spark plug adapter with a length of hose attached. Apply compressed air to the cylinder and stuff shop rags into the cylinder head holes around the valves to prevent parts and tools from falling into the engine. Use a valve spring compressor to compress the spring, releasing the valve stem keepers and lifting them out with a magnet or needle-nose pliers. Remove the spring retainer and valve spring, then the valve stem seal. Wrap a rubber band or tape around the top of the valve stem to prevent it from falling into the combustion chamber, then release the air pressure. Inspect the valve stem for damage, ensuring it doesn't bind in the guide; if it does, the cylinder head will need to be removed for repair. Reapply air pressure to retain the valve in the closed position, then remove the tape or rubber band. Lubricate the valve stems with engine oil and install new valve stem seals, using a special tool or a deep socket and hammer to seat them. Install the valve spring over the valve with the more closely-wound coils and paint mark toward the cylinder head, followed by the valve spring retainer. Compress the valve springs and position the keepers in the groove, applying a small dab of grease to hold them in place. Remove the pressure from the spring tool and ensure the keepers are seated, then disconnect the air hose and remove the adapter from the spark plug hole. Reinstall the camshaft and lifters, then the timing chain, followed by the valve covers. Finally, install the spark plug(s), ignition coils, and the upper and lower intake plenum as necessary, start the engine, and check for oil leaks and unusual sounds from the valve cover area.

Essentially worn out valve springs and faulty valve stem seal can be repaired without removing the cylinder heads,usually this involves the usage of two tools and a compressed air. Initiation requires the preliminary step of the removal of the valve cover or several covers and the rocker arm along with the lifters' guide assembly. OPOP the spark plug out of the affected cylinder, if the entire set of valve stem seals is to be replaced, then pop out all the spark plugs. Let the crankshaft come to a position where the piston of the affected cylinder is on the Top Dead Centre. If changing all valve stem seals, begin with cylinder # 1 and work from that cylinder to number 2 and so on, always following the firing order. Feed a long adapter into the spark plug hole and attach the other end of the air hose to the present compressed air source. As much as the spark plug tubes are relatively long, the long spark plug adapter, which accompanies a hose attachment, is required. Press the air to the cylinder and push the shop rags in the cylinder head holes around the valves so that small parts and tools will not fall in the engine. Apply lubrication on the thread of the valve stem and then remove it using the valve spring compressor; you need to compress the spring so that you can remove the valves stem locks. The valves should seat by air pressure; if they cannot, the cylinder head may have to be removed for a valve grind. Drop the spring retainer, the shield, and the valve spring and then, pull out the valve stem seal. Twirl the rubber band or the tape over the top of the valve stem so that it will not drop to the combustion chamber then deflate it. Check and look at the valve stem for any signs of wear; it should turn with ease in the guide without getting stuck. Apply pressure on the end of pipe to keep the valve closed, then, undo the tape or rubber band. Using engine oil, grease the valve stems and replace the valve stem seals for the intake and the exhaust but do not mix them. Place the inner and outer springs over the valve with the tightly coiled spring towards the head of the cylinder, next is the valve spring retainer. Compact the valve springs and put the valve stem locks in the groove, and than apply little amount of grease for the locks to stay fixed. Pull out the spring tool and make certain the valve stem lock shoulder is in place. Remove the air hose coupling and take out the spark plug adapter from SP hole then replace the lifter assembly and the rocker arm assembly, and the valve cover. Last of all, put the spark plug(s) back and connect the wire(s), cranking the engine and looking for oil drops or any abnormal noises at the vicinity of the valve cover.

Compress the spring just enough to remove the keepers with a magnet or small pliers.

Inspect the valve and its stem for damage, rotating the valve in the guide to check for eccentric movement, which indicates a bent valve.

After removing the valve cover(s), the spark plugs should be removed, and the crankshaft should be turned until the piston in the affected cylinder is at Top Dead Center (TDC).

Wrap a rubber band or tape around the top of the valve stem to prevent it from falling into the combustion chamber, then release the air pressure.