hi to all, I stumbled upon this site, and found losts of great info. but I still have a few questions. I have an older mercruiser 3.0 some time around 1990 maybe 91 or 89 not sure. anyhow, I think I maybe be having oil pressure problem, becuase my oil guage jumps around, erraticly, at idle it's still but have you give it gas it begins to jump, I understand it should move slowy in realationship with rpms, but thats not what it't doing, and it always seems to stay close to 40. also my oil level seems fine when cold but after the engine warms up, it seems low. how many quarts is this engine suppose to have.. one other reason I think there is a problem, is becuase I hear a really load rapping noise occasionally, mostly at low rpms ( under 3000) but it does come and go it's really really load, loader than a lift rod or push rod. and it sound like it is commign from the lower lefthand side near the transome, almost seems like it is comming formthe alternator. that is if your looking at the motor from inside the boat... I'm puzzeled. any idea as to what might be going on here? any help will be greatly appreciated
