My engine has a noise in it sounds like a tapping sound it goes up with rpm but kinda fades out because its goin faster but at an idle it sounds the loudest, i did the screw driver test and on the water pump cover / just above it is where its making the loudest soud from also checked the cyclinder and other engine case and u can hear the noise but its not as loud , could it just be the counter balancer or water pump bearings ? Also when i put the screw driver on the head u can here a tapping like the pistons is slapping the top of the head its not very loud but its there , any ideas ?