Nissan 13207-81W00 Seal-Oil Valve

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.

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. The universal shaft-type valve spring compressor needed for the tight valve spring pockets of this vehicle may not be available at all tool rental yards, so check on availability before starting the job. Begin by removing the upper intake manifold and the valve covers, followed by the timing chain, camshafts, and lifters from both cylinder heads. Remove the spark plugs and turn the crankshaft until the piston in the affected cylinder is at Top Dead Center on the compression stroke. If replacing all valve stem seals, start with cylinder number one and work on one cylinder at a time, following the firing order sequence while turning the crankshaft 120 degrees to bring the next cylinder to TDC. 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 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 and remove the valve stem locks with small needle-nose pliers or a magnet, ensuring the valves are held in place by air pressure. If the valve faces or seats are in poor condition, leaks may prevent air pressure from retaining the valves, necessitating the removal of the cylinder head for a valve job at a machine shop. 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, checking for eccentric movement that would indicate a bent valve. Move the valve up and down in the guide to ensure it doesn't bind; if it does, the valve may be bent or the guide damaged, requiring cylinder head removal for repair. Reapply air pressure to retain the valve in the closed position, then remove the tape or rubber band from the valve stem. Lubricate the valve stems with engine oil and install new valve stem seals, which can be installed with a special tool or a deep socket and hammer-tapped until seated. Position the valve spring over the valve with the more closely-wound spring coils toward the cylinder head, then install the valve spring retainer. Compress the valve springs and carefully position the valve stem locks in the groove, applying a small dab of grease to hold them in place. Remove the pressure from the spring tool and ensure the valve stem locks are seated. Disconnect the air hose and remove the adapter from the spark plug hole, then install the camshafts and lifters, followed by the timing chain. Finally, install the valve covers, spark plugs, ignition coils, and the upper intake manifold as necessary, then start and run the engine, checking for oil leaks and unusual sounds from the valve cover area.

To do this, you will need a compressed air system and special tools. After removing the valve cover and top timing chain, camshaft and lifters should be removed from affected cylinder head. In case you plan to replace all the valve stem seals, remove all spark plugs. Put the piston of the bad-cylinder at TDC in its compression stroke by turning the crankshaft. Place an adapter into the spark plug hole and use compressed air on that cylinder. For protection against debris entering the engine, fill with old rags around each valve. Use a spring compressor to compress spring and remove valve stem keepers. Pay attention to any bending or misalignment of the valve stem. Replace valve stem seals, lubricate valve stems then reinstall valve springs, retainers and keepers. Take off compressed air then reset camshaft, lifters, timing chain, valve cover then spark plugs and plug wires. Finally start as well as run an engine; check oil leaks and abnormal valves covers sounds.

Typically, two special tools and a compressed air source are required.