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After changing one today, I think I would rather pay someone to do it next time. First thing, disconnect the battery. Then take off the top radiator hose and the housing that connects it to the engine(you don't need to take off the radiator hose connecting unit, just take the fans off of the radiator, saves the messy silicone work). You will never get the alternator out if you don't. The next step is to remove the belt. If you are planning on changing the belt then you will have to remove the powersteering belt too in order to get it off. There is an 8mm tensioning bolt between the alternator and the air conditioning compresser. First loosen the 14mm bolt in the center of the idler pully and then loosen the tensioner bolt until the belt slips off. There are three mounting bolts, two on the bottom and one on top of the alternator. Remove these, and the bracket that the top bolt mounts to. Now disconnect the wires from the alternator and the plastic bracket which is attached to the alternator. Finally you should be able to pull the alternator out of the engine compartment. Reverse the procedure to replace the alternator. Here is a list of the tools you will need.

8mm, 10mm, 12mm, 14mm wrenches

10mm, 12mm, sockets and a 3" extension (for bottom passanger side bolt on the alternator use a long 7/16 and a ratchet w/no extension)

Phillips screwdriver

silicon gasket material

bandaids

Small hands and patience will also help with this job.

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Q: How do you replace the alternator on a 1998 Nissan Sentra?
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