From what I understand it’s not for wading up to the time case cover but for a vacuum created when you leave the wading plug in, but I could be mistaken

When fitting wading kits I’ve see people install a new timing case cover for a breather, this only seems necessary when the wading plug is fitted. The compressor belt tensioner gets in the way of of this breather being fitted. Is it necessary to fit the timing case breather, will it cause issues...