ji126652 Posted September 5, 2021 Share Posted September 5, 2021 2012 Subaru Legacy 2.5i here with 97,500 miles. I've read that it's never a bad idea to replace an alternator at around 100k miles, but I've also read here that Subaru alternators can last "a very, very long time." Thoughts? Also I've read on this forum that Duralast are really good alternators, but they don't make new ones for my Subaru. Any thoughts on the next best kind? Or get remanufactured? Lastly any thoughts on when the Crank Pulley should be replaced? Should I just wait for the tell-tale signs of the pulley (or related engine parts) to go bad, like misfiring or rattling noises or vibrations? Thanks! Link to comment Share on other sites More sharing options...
whitexc Posted September 6, 2021 Share Posted September 6, 2021 Is the alternator giving you signs of end of life? Not many of us just replace parts for the sake of doing so. If you are dealing with charging issues, etc then yes. Sent from my SM-G996U using Tapatalk Link to comment Share on other sites More sharing options...
rhino6303 Posted September 6, 2021 Share Posted September 6, 2021 Just replace the two bearings. The bearings are the faster wear items. Link to comment Share on other sites More sharing options...
dgoodhue Posted September 6, 2021 Share Posted September 6, 2021 I would replace the alternator and crank pulley when they fail. Neither of them are common problems at 100k miles. Link to comment Share on other sites More sharing options...
ji126652 Posted September 6, 2021 Author Share Posted September 6, 2021 Is the alternator giving you signs of end of life? Not many of us just replace parts for the sake of doing so. If you are dealing with charging issues, etc then yes. Sent from my SM-G996U using Tapatalk I forgot to mention that there is a constant "whizzing" sound coming from the alternator, kind of like a loud bug, rather than a "grinding" noise. I've read somewhere that this is normal? It just has me worried a bit. Link to comment Share on other sites More sharing options...
ji126652 Posted September 6, 2021 Author Share Posted September 6, 2021 Also, if I just slip the serpentine belt off to check the alternator pulley, what should I look for? Noise free and freely moving with minimal to no friction? Link to comment Share on other sites More sharing options...
Plastixx Posted September 7, 2021 Share Posted September 7, 2021 My '09 3.0R Outback has 210k miles with the original alternator. I would steer clear of parts store alts. OEM, used OEM, or one from Maniac. Maniac also sells rebuild kits/parts if you're feeling frisky... https://www.maniacelectricmotors.com/2010-subaru-legacy-outback-2-5l-alternator.html Link to comment Share on other sites More sharing options...
dgoodhue Posted September 7, 2021 Share Posted September 7, 2021 I think some when you looking at the engine, you sometimes become hyper sensitive. I am mechanically inclined, earlier this year I was selling my GF car and somebody said her engine had a ticks in it. I had never noticed and question myself if it did, after the guy left. I realized it was just injectors ticking. My 2.5i OB and Legacy GT make the same noises. Link to comment Share on other sites More sharing options...
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