the oil pump sprocket had come off the oil pump and was hanging in it's drive chain!
some muppet must've not tightened the retaining nut properly, the nut was in the sump
potentially a free fix
the oil pump tensioner's damaged but i think it's not needed, only added to give quieter running, the older m30s don't have a tensioner at all. bit of research needed but at least i don't need Ԛ£250 of new oil pump!









