Sounds to me like the auxiliary'serpentine' belt tensioner failing - the housing cracks and the belt starts to run off the edge of the pulley. Common issue on this engine, usually around the mileage you have.
Not mega urgent, but you need to get it looked at reasonably soon, they can fail completely, and then the belt can break a few bits as it tries to leave the engine bay.
Jon 1992 RR Classic 3.9 efi Vogue
2014 Disco 4 HSE
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Both my fatties now gone...
Previous: 2011 L322 4.4 TDV8 Vogue SE /// 2002 L322 4.4 V8 HSE /// 2009 Discovery 3 2.7 TDV6 XS /// 2004 Defender 90 TD5 /// 1993 110 V8 Snatch Landrover /// 2005 Discovery 3 2.7 TDV6 SE (Aus) /// 1990 110 Isuzu 3.9 County (Aus) /// 1976 Series III Trayback (Aus)
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