The 1988 Nissan pickup uses two drive belts. The smaller drive belt runs the alternator and AC compressor. The larger drive belt, called the serpentine belt, runs all of the other accessories. Each belt is removed from the engine in a different manner. It is a good idea to change both belts at the same, as they generally wear out within the same period.
Tools Used: Socket set
Replace Drive Belts
Smaller Drive Belt
Locate the idler pulley for the smaller belt. The idler pulley is in-between the pulleys for the alternator and the AC compressor.
Loosen the nut that locks the idler pulley in place, using a socket and ratchet.
Pull up on the idler pulley to loosen tension on the drive belt.
Pull the drive belt off the three pulleys, and place the new belt onto the three pulleys.
Push down on the idler pulley, and lock it into place, by tightening the nut in the center of the pulley.
Larger Serpentine Belt
Locate the idler pulley on the bottom of the engine. The idler pulley acts as a tensioner, by putting tension on the belt as it wears and loosens.
Place the 3/8-inch ratchet driver from your socket set into the square hole on the idler pulley, and lift up on the handle.
Slide the belt off the idler pulley, and remove the belt from the other pulleys.
Place the belt onto the pulleys other than the idler pulley.
Pull up on the ratchet handle, and slide the belt over the idler pulley.
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