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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!
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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.
 
flyingscott said:
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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I had 2 oil injected 2 stroke Mercury's and the oil tank was under the engine cowl and held about 3 quarts of oil when full. Didn't have a pressure relief valve and certainly wasn't 10 gallon.
 
Texasmark said:
I had 2 oil injected 2 stroke Mercury's and the oil tank was under the engine cowl and held about 3 quarts of oil when full. Didn't have a pressure relief valve and certainly wasn't 10 gallon.
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Actually I may have had 3....a 1988 115 I6 with a small external tank, no tank in the engine compartment and 2002 90 and 115 Loopers with self contained tank as described. I bought the I6 new and the others used. Recalling.....best I can...since it was so long ago, I think toward the end of my ownership I had some kind of problem with the external tank but it wasn't pressure.
 
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