My mariner 9.9 was choking a little during the last fishing trip of last season. It had made a ton of oil in the crankcase, filled up with gas not water. I flushed it out over the winter, it started right up and ran like a champ the last three trolling trips. I checked it tonight and its making oil again. Any thoughts on what is causing this?
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Kicker making oil
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gas on crankcase is usually caused by carburetor float valve sticking open. Fuel leaks through the carb. into cylinders an then into crankcase. This a common problem with small engines with gas tank higher than engine. Cure by putting inline valve in fuel line before carb. and turn off after each use.When seconds count, the cops are just minutes away.
'08 24' HCM Granite HD "River Dog"
2018 12' Moto Jet "River Pup"
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Originally posted by Music Man View Postgas on crankcase is usually caused by carburetor float valve sticking open. Fuel leaks through the carb. into cylinders an then into crankcase. This a common problem with small engines with gas tank higher than engine. Cure by putting inline valve in fuel line before carb. and turn off after each use.
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Cool, Thanks. The kicker is fueled by the main tank and its not above the engine so it shouldn't, i don't think, be able to push or suck fuel into the engine when its not running, i think that is what you're saying. although maybe a new carb kit wouldn't be a bad idea. My buddy told me bad piston rings maybe?
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Originally posted by B.I. View PostCool, Thanks. The kicker is fueled by the main tank and its not above the engine so it shouldn't, i don't think, be able to push or suck fuel into the engine when its not running, i think that is what you're saying. although maybe a new carb kit wouldn't be a bad idea. My buddy told me bad piston rings maybe?
Installing a shut off valve as suggested would be a good test to eliminate such a cause and is a good thing to have inplace regardless.
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Originally posted by .338WM View PostIf the rings were worn so bad as to allow the fuel to pass them the engine would not run as it will suffer inadequate compression.When seconds count, the cops are just minutes away.
'08 24' HCM Granite HD "River Dog"
2018 12' Moto Jet "River Pup"
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The choking thing says it. It's running rich because the needle and seat isn't sealing like it should and you are pushing partly burned gas past the rings. If it's filling up while not running then there is a gravity/siphon problem along with the leaky needle and seat. It does need the carb cleaned and check to see if there is any bits of stuff in the seat causing it not to seal. Probably a good idea to just put a kit in it and make sure there is no dirt in the carb.
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Originally posted by Music Man View PostNot so. Rings are not 360*. The split ends will let any liquid past each ring. This is more pronounced in vertical engines but will occur in horizintal if there is enough fluid in the cylinder.
Often times after an engine has been severly flooded, a engine in excellent condition will not start due to lack of compression caused by washdown of the cylinder walls ( the gas removes the film of oil coating the cylinder walls), compression can fall up to 50% or more. When this happens the spark plugs need to be removed and oil introduced into the cylinders restore compression and engine to restart.
3 Days Ago
B.I.Kicker making oil
My mariner 9.9 was choking a little during the last fishing trip of last season. It had made a ton of oil in the crankcase, filled up with gas not water. I flushed it out over the winter, it started right up and ran like a champ the last three trolling trips. I checked it tonight and its making oil again. Any thoughts on what is causing this?
Clearly the engine is running fine, therefore, the crankcase contamination is occuring at rest. It may exhibit some symptoms during starting and then clear due to a rich cylinder( may be not noticable since it is under choke anyhow) until the excess fuel is burned.
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Originally posted by B.I. View PostThanks guys. I like what you are saying .338 and hope its not rings. I have a carb kit on the way and will clean her up. where is best to put the shut off valve, outside the cowling right?
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