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
2012: ARP headstuds, OEM gaskets, standpipes and dummy plugs
2015: XDP coolant filter