Nissan 38189-7S000 Seal-Oil,Drive Pinion

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Firstly, in order to start the process of replacing the differential pinion seal, you have to loosen the lug nuts on the wheels and firmly raise the front or back of your vehicle with jacks while blocking off any other wheels to prevent them from moving . After this, take off your wheels and remove driveshaft from the differential companion flange and set it aside. Next, remove the rear brake discs and rotate manually a pinion shaft several times. Using a beam-type or dial-type inch-pound torque wrench measure torque needed for pinion rotation and note down this value for reference. Also, mark the position between pinion flange and shaft; count exposed threads over nut and note among others things about these details. In order to release a self-locking pinion nut use a flange holding tool, which will prevent movement of the companion flange. The nut is pulled carefully out by using two-jaw pullers if necessary. No attempt should be made at prying or hammering behind the flange or at hammering on the end of pinion shaft. Then pry out, discard old seal. After lubricating lips of new seal, fill wheel bearing grease into space between its lips evenly tapped into place with large socket while ensuring it sits squarely as well as reaches full depth within housing using either a seal installation tool or large socket.. While aligning marks that were previously made install pinion flange into place. If necessary, tighten pinion nut to draw flange into place without any need for hammering on it. Apply RTV sealant to visible ends of splines sticking out in middle of flanges as shown between arrows to seal in oil (Fig. 12). Install new pinion nut followed by new lockwasher (never reuse old ones) and tighten nut (Fig 11). Meanwhile recheck torque necessary for correct rotation rate of pinion and tighten gradually incrementally not exceeding 5ft-lbs until it increases to the value recorded. Finally, tighten the nut slightly more to accommodate new oil seal's drag, until pinion's rotational torque is 5 in-lbs greater than that previously recorded. Warning: if desired preload is not achieved before the maximum nut torque is reached, the differential should be disassembled and a new collapsible spacer installed. Re-install all items previously removed after reversing the steps for removal and tighten fasteners to specified torque values.

No, it is relatively easy to replace the extension housing oil seal without removing the transmission from the vehicle.