How do you replace the tie rods and idler arm in a 1987-1995 Nissan Pathfiner?
For replacing all four tie rods you need two outers and two inners. They're entirely reversible if you get one out of order. I've swapped them around outer-inner wise and they still work perfectly fine. You just can't get four inners or four outers to work together because the threading on the inner and outer are reversed so that after they screw into the center adjusters, they can be adjusted in and out for alignment purposes. The center adjusters can be re-used unless you need new ones due to them being stripped or damaged.
To change tie rods (both at once), remove the cotter pins from the tie rod end studs, remove the castle nut, then use a balljoint or tie rod puller to separate the joints from the centerlink on the inside and the steering knuckles on the outside. Try to avoid using a pickle fork, they can damage both your hand and the rubber boots on the (hopefully) still good parts you don't need to change. When removing the tie rods, you need to pay close attention to the length of threaded rod remaining outside the adjuster nuts in the center before you loosen the adjuster nuts. Try to keep the length the same as it used to be, or as close as you can get it. Measuring the amount of exposed threads on the old tie rods will give you an idea of exactly how far to thread together the new tie rods. Keep them even when you thread them into the adjuster so the inner isn't all the way in while the outer is all the way out, or vice-versa. That way they have a full range of adjustment travel in the adjuster for alignment.
Installation is the reverse of removal, only you don't need a puller, just tighten down the castle nuts to the proper specs before installing new cotter pins. Remember to grease your new tie rods, most new ones come with grease zerks even if the old ones didn't. By the way, you DO have a Chilton's book for the vehicle, don't you? If not, they're only $15 and one is definitely worth having. To be honest, if you're a screwdriver mechanic I would find someone you trust to help you on this project, it's not something to want to half-ass and then find out about later. -88pathoffroad