Compression Ignition Addict
Join Date: Jun 2011
Location: Colorado Springs
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I am assuming it is not your belt making a squeek or other noise...
Typically if something is designed to go round and round, and it starts making a whining noise, you will need to plan on replacing it fairly soon. If it had greasable bearings or replaceable bearings it may be a different story, but most alternators aren't meant to be serviced by at home mechanics.
2005 F-250 6.0L, crew cab, long bed 4x4
completed in 2011: STC update, new IPR, BPD EGR cooler, oil cooler rebuild, 6.4 banjo bolts, blue spring update, SCT X3, Insight CTS, 58V FICM, CCV Mod, DIY coolant filter (now gone), refinished turbo
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2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter