Are you referring to the lower sub pan or main oil pan? the lower sub pan on most nissan engines are fairly easy to diy. just unbolt all the fastening bolts and you would need a pry bar or screwdriver to pry off pan. remove the old liquid gasket on pan and on main pan mating surface and reapply liquid gasket. reinstall lower sub pan and install fastening bolt.
if you are referring to the engines main oil pan its a more extensive repair. you would need the correct tools and equipment such as trans jack and engine support holder.
SOURCE: Need torque specs for oil pan gasket
There likely is a spec for oil pan but unless you are a finatic, you really don't need to know what it is. Simple rule: Don't crank down ******* any fastener. If corners near crank ends have larger fasteners, you can tighten them a bit more than on siderails. Before tightening anything, install all bolts finger tight, to ensure that they are not cross threaded. To avoid warping pan, tighten from the center of the pan, working towards both ends, alternating from side to side as you go. When you are finished, go over it again, using the same amount of force on each bolt. As I said, end bolts can if larger in diameter, be tightened more but be careful not to tighten so much that you will either split or push the gasket out the sides.. Anywhere two gasket ends **** together, I recommend using a sensor -safe dab of silicone. An oil pan is not under any mechanical stress or pressure. I have used this method for many years and NEVER had one leak. If you really need #s, small fasteners get about 12-15in lbs, larger ones about 20.
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