Hi guys, I'm new to this I have a 86 MCM140 with a new head gasket as of last year and alternator. I've been having a rattling noise at probably 1500 to 2000 rpm then it goes away at higher or lower RPMs. The boat seems to run fine at wot and idle. I checked the flywheel cover for cracks and couldn't see any visible to me. I do have a video of the noise, which seems to be coming from the front part of the engine by the pulleys bit I can't find any loose bolts or anything.
