any idea what could be causing a drum noise. i hear it during idle. no power loss. only issue i have is low fuel mpg. dd15 cas adia 2012. 870k miles
My DD15 was rebuilt for a head n head gasket, on restart had a squeak or squeal sound he said took it apart upper/lower bearing slightly scored, replaced on restart same noise he has it apart again and doesn’t see any issues , any ideas ??