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2012 150hp Mercury Optimax Oil 10gal Reservoir swelling

H

Hefner

New member
As the title says, my 10gal reservoir is swelling while running. It swelled to the point of cracking :(. I’m not getting any warning lights. My VesselView shows normal temps and I have good flow from the pee stream. I’ve read that the vent could be the issue, but I don’t see any obvious vent line issues. What is best to diagnose the issue? Thanks for your help!!
 
flyingscott said:
should be a pressure relief in the tank check to make sure its working those motors use crankcase pressure to pump oil.
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I don't know anything about the engine but for a designer to put a pressure relief valve on a plastic tank meant that under certain conditions the pressure could rise high enough to do what you said. Makes sense to me. I'd be installing a new valve in a new tank....or the new tank probably comes with one.

So the questions are: Is the system design such that overpressure occurs often, or is this a safety measure for something elsewhere in the engine system might fail causing the over pressure......someone on here in that business would have that answer!
 
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Texasmark said:
I don't know anything about the engine but for a designer to put a pressure relief valve on a plastic tank meant that under certain conditions the pressure could rise high enough to do what you said. Makes sense to me. I'd be installing a new valve in a new tank....or the new tank probably comes with one.

So the questions are: Is the system design such that overpressure occurs often, or is this a safety measure for something elsewhere in the engine system might fail causing the over pressure......someone on here in that business would have that answer!
Click to expand...
Mercury has used that system for years on their oil injected motors. Even the carbed motor used it so its a good reliable system but these tanks are getting older nothing is new forever.
 
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