How do you remove and replace the valve stem oil seal in a cylinder head on Nissan Rogue?

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Accepted Answer

Loosen the cylinder head and put it on a hard surface or better still a working table. Apply a large clamp type of valve spring compressor that has an adapter where by when compressing each valve spring, the bottom section of the tool should be placed under the valve being compressed. Wind the spring just to the extent that you will be able to remove the keepers with a magnet or small pliers. Withdraw the valve spring together with the retainer and then carefully take out the rusted valve stem oil seal with the help of the pliers. Examine the exterior and the stem of the valve for excessive wear, and turn the valve relative to its guide to determine if it moves off center, if so then the valve is bent. Wipe the valve up and down in the guide and if it sticks the groove must have become rotated or the guide worn and the cylinder head will have to be machined. Apply a drop of oil on the valve stem before positioning the valve in the cylinder head; you need to place a plastic protector around the new rubber seal as it is fitted to avoid damaging it. If a seal protector is not available, crowd cellulose tape around the valve stem. Apply multi- purpose grease on the new seal and fit it over the valve stem and remove the protector or tape on it. Lightly engaging a deep socket of the right size, give the new seal a tap and place it down on the top of the valve guide. Align the spring over the valve along with the retainer engaged, then using the fingers and a small hammer, squeeze the valve spring and retainer and then engage the keepers on the groove with a small amount of grease if needed. Remove the pressure in the spring tool and make sure that the keepers are properly locked in place. After that, re-attach the lifters and camshafts back then finish the process by following the removal process in the opposite manner. Ignition of the engine and ensure that there is no signs of oil stains and strange noises coming from the valve cover.

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