Delphi style alternators on some of the engines have a history of alternator bearing failure. Bearing failure will cause a whining noise coming from the engine compartment.Google+
Car Problem Reports
Honda Accord Alternator Bearing May Fail
Honda Accord Problem
Electrical & Lights Affected: 3.0L V6
Average Mileage: 110,000 mi (55,000 mi - 140,000 mi)
Visitor, 2000 Honda Accord, 135,000 mi
loud whirring noise from engine compartment
Be carefull when presure washing your engine.
One day the alternator started whining, and stopped charging at the same time. It needed replacement and the manufacturer agreed to pay for parts even though it was out of warranty. I paid labor, which at the Honda Dealer, was over 200.00.