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Whining noise V12

Chris Jackson

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Brand new to the site so apologies if I’m posting in wrong area!! 
Just bought a 92 XJS V12. It’s got a whine / low howl at low revs that disappears under light load and only comes back on backing off or tick over. I was thinking oil pump or water pump but would that disappear under load?? The oil pressure gauge drops quite low but no warning lights and I’ve read the OP gauges are notoriously vague. My instincts say not oil pump and the cars smooth and purrs once under light pedal pressure. Fan belt ? Alternator - ( charging strongly ) . The car has 75,000 and a superb maintenance history . Any ideas?? Thanks 

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