Guests - If You want access to member only forums on FM. You will gain access only when you Sign-in or Sign-Up on Fishing Minnesota.

It's easy - LOOK UPPER right menu.

  • Announcements

    • Rick

      Members Only Fluid Forum View   08/08/2017

      Fluid forum view allows members only to get right to the meat of this community; the topics. You can toggle between your preferred forum view just below to the left on the main forum entrance. You will see three icons. Try them out and see what you prefer.   Fluid view allows you, if you are a signed up member, to see the newest topic posts in either all forums (select none or all) or in just your favorite forums (select the ones you want to see when you come to Fishing Minnesota). It keeps and in real time with respect to Topic posts and lets YOU SELECT YOUR FAVORITE FORUMS. It can make things fun and easy. This is especially true for less experienced visitors raised on social media. If you, as a members want more specific topics, you can even select a single forum to view. Let us take a look at fluid view in action. We will then break it down and explain how it works in more detail.   The video shows the topic list and the forum filter box. As you can see, it is easy to change the topic list by changing the selected forums. This view replaces the traditional list of categories and forums.   Of course, members only can change the view to better suit your way of browsing.   You will notice a “grid” option. We have moved the grid forum theme setting into the main forum settings. This makes it an option for members only to choose. This screenshot also shows the removal of the forum breadcrumb in fluid view mode. Fluid view remembers your last forum selection so you don’t lose your place when you go back to the listing. The benefit of this feature is easy to see. It removes a potential barrier of entry for members only. It puts the spotlight on topics themselves, and not the hierarchical forum structure. You as a member will enjoy viewing many forums at once and switching between them without leaving the page. We hope that fluid view, the new functionality is an asset that you enjoy .
Sign in to follow this  
18 inch Crappie

4 stroke "making oil"

Recommended Posts

18 inch Crappie    0
18 inch Crappie

I have a 115 Johnson 4 stroke that when I did the oil change this weekend, The oil was up 1 inch from when I filled it. I have heard water and gas. But does anyone have any insite on this?

Share this post


Link to post
Share on other sites
Powerstroke    20
Powerstroke

Was the oil pretty clean? I"d be concerned about some kind of contamination from something getting in past a seal.

Share this post


Link to post
Share on other sites
upnorth    2
upnorth

If it wasn't milky, you probably had or have gas in your oil. Did you by chance smell it?

Share this post


Link to post
Share on other sites
18 inch Crappie    0
18 inch Crappie

oil is clean and no gas smell that I can tell.

Share this post


Link to post
Share on other sites
18 inch Crappie    0
18 inch Crappie

Here is what I found

I get a few customers each year with high oil levels in their 4-stroke outboards and it's really tough to explain why sometimes. So I prepared this to present to customers with the problem and I thought it would make a good FAQ.

Q. Why does my 4-stroke outboard oil level keep rising? I never add any. Shouldn't it be going down?

A. This is referred to as "Making oil". Here it is in a nutshell. Water vapor enters the crankcase of all motors from the atmosphere, and as a by-product of combustion. In other motors, the oil gets rather hot and any water vapor that may condense will steam-off and exit the crankcase breather. 4-stroke outboard motor oil doesn't get nearly as hot, so the water just keeps on collecting.

Q. Is it always water?

A. No. Tiny amounts of raw fuel also leak into the crankcase on the compression stroke, potentially diluting the oil and raising the level on a cool-running motor. Or there could be a fuel system leak. Typically the odor of the latter situation is fairly obvious, but not necessarily. Lack of a gassy smell shouldn't preclude checking the possibility of fuel system leaks. Over choking and frequent flooding will also cause fuel to get into the oil.

Q. Where does the water come from?

A. Three sources. Asmosphere, combustion and fuel. There's always moisture in the air, especially near bodies of water. Some condenses out naturally and collects in the crankcase of a sitting motor. Some comes in right along with the air as it runs. The body of water you're operating on produces a lot of atmospheric water vapor, especially a few feet above the water line ... where the powerhead is.

H20 is one of the compounds that forms when gasoline is burned, along with CO, CO2, NOX, etc. Some leaks into the crankcase right along with the other contaminants and mixes into the oil. Alcohol combustion makes mostly CO2 and H2O, so alcohol-blended fuels tend to produce more water vapor than straight gasoline.

Q. Wouldn't my oil turn milky if water was in there?

A. Eventually it will. But oil has some capacity to retain water and it eventually reaches a threshold where it starts to cloud.

Q. Why doesn't the oil get hot enough to steam it off?

A. It can. If the motor is running hard enough to plane the boat, water that otherwise cools the oil isn't splashing on the sump that holds the oil. But boats that are run at non-planing speeds may not heat the oil up very much at all. The water the boat is running in cools the oil which is in the sump beneath the powerhead. That water can keep the oil pretty cool just by splashing against the outside of the aluminum sump.

Motors that are mostly operated at sub-planing speeds seem to be especially susceptible to making oil. Many times the complaint is that a kicker used for trolling has the problem, but the main motor doesn't. That's because the main motor is used to get to the fishing spot fast to troll slow with the kicker. One is hot, the other is not.

Q. Why is it a problem with my motor and not my neighbor's?

A. Two things really aggrivate the problem. Cool running temperature of the oil, and the abundance of moisture available that inevitably collects. The environment the boat is kept in, water temperature, the fuel you use, and the way you operate the motor have huge effects on whether or not this is going to be a problem.

Q. Wouldn't a hotter thermostat solve the problem?

A. Doesn't help much, but it helps. Problem is that you're regulating coolant temperature and not oil temperature. The oil will get a little warmer as a result, but the powerhead will be running hotter and that's probably not good. Then consider that if the sump is getting splashed by water, that pretty much cancels it out.

Q. How can I be sure of what is making the oil?

A. You can have the oil analyzed. There are many labs that test automotive oil. Outboard readings may not be consistent with what would be expected from an automobile engine, so interpreting the data could be problematic. But it sure will show what is in the oil. A quick search yielded a lot of labs offering this service through the mail for a wide range of prices. Shop around, but it could be money well invested.

Q. So what can I do about it?

A. Right now, the approach is to minimize the amount of contamination allowed to enter. That means keeping the motor as unexposed to atmospheric moisture as possible. Practical in some situations, impossible in others. The manufacturers are also stressing proper and agressive break-in procedures to mate surfaces better and keep leakage into the crankcase (blow-by) to a minimum. Avoid alcohol-blended fuels if you can. Finally, allow the motor to get hot enough to steam-off what water will inevitably collect in there. That'll probably mean running it hard for awhile. (If your lake has a speed limit ... Ouch!)

If all of that fails, have the motor checked for gasket leakage. It could be coming from the cooling system. More frequent oil & filter changes may be necessary. But try running the motor hard for several minutes every time you go out. That's the easiest, cheapest, and most enjoyable thing to try.

Q. So you mean I HAVE to open it up and go fast once in awhile?

A. Dang shame, ain't it?

Share this post


Link to post
Share on other sites
Ufatz    0
Ufatz

Thanks for an excellent post!! Should be stuck on the side of every new 4-stroke.

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  



  • Posts

    • monstermoose78
      Caught some gills this was the first one 
    • guideman
      Thank you one and all, especially you Tommy. Some very kind words and ditto to you my friend. "Ace" "It's just fishing man"  
    • tacklejunkie
      Picked up some nice crappie and a couple eater walleyes on Allouez Bay the other day before the rains. Trolled crawlers with one light split shot and others with bottom bouncers. I was surprised at how big the crappie were
    • easyrider25
      ripped out some old boards that were well past their prime on my boat.  Any recomendations on what to replace them with?  They looked to be treated plywood but wondering if getting something different would work better.  Such as a piece of 1 x 12 pine and throwing a few coats of polyurethane on it as well?  The boards I am talking about are for the benches.   Also, replacing the seats in there as well.  Previous i had the the vinyl foam seats.  When shopping around i am seeing a lot of the molded plastics chairs.  Any preference out there for durability?  Vinyl rips but wondering if the molded crack or break?   Thanks for any feed back!
    • monstermoose78
      Off to wet a line !!
    • monstermoose78
      The flocks of geese are now flying over my house in the morning and evening, but when this happens Finn gets all jacked up. Like right now he is nudging me and running pawing at the window. A few minutes earlier when the first gaggle few over I was going to change the laundry and Finn raced down and sat by gun safe  whining.  Fishing reports have been great for crappies on the area lakes. Walleyes are not biting as well in lakes but when the rum is clearer that is the place to be. Bears any no quota hunters this might be your year to get a bear around here.  Deer seem to every where drive carefull.  Seeing some ducks flying around.  I have seen a few grouse and pheasants.
    • delcecchi
      I've been by a time or two trying to figure out which place is yours.   I was out on wakemup last night too.   Got nothing, on crawlers.  Started out at merry go round, went to "picnic island" (little island east/south of taylors).  rigged along edge of those two humps in like 18-25 feet.   Musky guys were coming so I turned.  They turned too, chunking baits in the vicinity of my boat.   Then some guys in a pontoon pulled up and anchored in front of me  and threw out bobbers.   Fished a while longer, and it was getting sort of dark so went home.   Weird.  I've been on those humps a bunch of times this year, and suddenly I get company.   And, even though it is a pretty big area they gravitated to where I was.  I'll be out today too, so if you need help with supervision, let me know.    But I will drive by to check out the new construction.   
    • gunner55
      Been getting a few on the weed line, early am when there's a little breeze, since the surface temps started coming down. That was about this month's full moon, for me. A very slow troll, fishing vertically, & just a 1/16 oz. jig.
    • delcecchi
      Still holding stable at 72 for the lest week or so
    • muskie-mike
      Finally, I try lead core every time I am up there and no luck so far..Seems the bite doesn't start til late August..Will try next week...thanks for the report...