2009 mercruiser 496 Mag
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I got this boat in Jan and heard the squeak during sea trial. Last owner died about 1.5 years ago and family didn't maintain boat. Had to get 2 new outdrives, pulled both motors for new motor mounts as outdrive couldn't be aligned. While engines were out replaced all kinds of stuff, new couplers, flywheels, hoses, alternators, idler pulleys and so on. Squeak seems to be internal, I pull serpentine belt off and squeak remains. I had mechanic and myself use a stethoscope but can not pin point noise. It can be heard kind of all around engine. Had a buddy suggest roller rockers? Any thoughts?
2009 mercruiser 496 Mag
I have another clue!
Sometimes I’ve noticed that the oil dip stick is not seated all the way down and you hear a hissing noise (vacuum) so I push dip stick down and hissing noise goes away. Today same thing but I pulled dip stick up and after a second or so my engine squeak went away. . I pushed dip stick back down to seal hole and engine squeak came back. I did this a bunch of times and every time I pull dip stick up out of tube my mystery squeak goes away. Could this be some kinda vacuum related noise? I’ve learned to live with it but it would be awesome to resolve.
Finding a toggle is always such a great feeling! There's not much to the PCV systems on these boats, so the first thing I'd start with is finding where the PCV valves are connected to the valve covers, and pull them out. My guess is that you've got a noisy valve. Running the engine with either/both in your hand would tell you right away if it's one of those. If not them, then it's just a process of elimination. With the boat sitting for a long time, it's also possible you have a valve cover gasket acting like a duck-call reed. Try snugging down the cover bolts lightly. Not too tight, or you'll warp the covers. Then, you will have a leak!I have another clue!
Sometimes I’ve noticed that the oil dip stick is not seated all the way down and you hear a hissing noise (vacuum) so I push dip stick down and hissing noise goes away. Today same thing but I pulled dip stick up and after a second or so my engine squeak went away. . I pushed dip stick back down to seal hole and engine squeak came back. I did this a bunch of times and every time I pull dip stick up out of tube my mystery squeak goes away. Could this be some kinda vacuum related noise? I’ve learned to live with it but it would be awesome to resolve.
If it’s vacuum related, removing the dipstick completely and holding your finger over the dipstick tube should recreate the noise as if the dipstick was seated.I have another clue!
Sometimes I’ve noticed that the oil dip stick is not seated all the way down and you hear a hissing noise (vacuum) so I push dip stick down and hissing noise goes away. Today same thing but I pulled dip stick up and after a second or so my engine squeak went away. . I pushed dip stick back down to seal hole and engine squeak came back. I did this a bunch of times and every time I pull dip stick up out of tube my mystery squeak goes away. Could this be some kinda vacuum related noise? I’ve learned to live with it but it would be awesome to resolve.