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  1. #1
    Member acslayer's Avatar
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    Unhappy 98' 200 EFI oil is everywhere

    found tiny oil puddles first and thought nothing of it but the last time I moved the boat it was a lot bigger. I think I traced it down but am not positive. I trimmed the motor up and let it sit for 30minites and I seen a very small amount of oil starting to run from the cap on the oil reservoir. There's a lot of oil everywhere else though, there's puddles sitting under the motor mounts and its dripping off of the top end of the lower unit and leaving puddles on the floor. The fuel filter and hoses on that side are also covered in oil. If I get lucky and its just a new cap and float I need to buy do I need to still prime or "air out" the system if I end up having to add oil. I read something in other posts last night on here when I was searching for this problem. I didn't see any cracks in the cap but maybe someone on here as another theory.
    I took pics before I wiped most of it down. I'm just unsure what I should do with it now, any info or recommendations would be helpful, I leave for my family fishing trip to northern Minnesota on the 9th, would be nice to have it taken care of by then.





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    #2
    order new cap they go bad

  4. Member MMosher's Avatar
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    #3
    Yup, sounds like you blew the cap. It happens, it i'll take ya longer to get the tools ready for it than it will to replace it. Mine blew this year for the first time. Make sure and re-pressurize when you have it back together. If I can fix it ANYONE can.
    Last edited by MMosher; 05-29-2012 at 04:19 PM.

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  5. Mercury - 3 Liter Moderator EuropeanAM's Avatar
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    #4
    Replace oil cap/sender assembly.

    Follow these instructions to bleed air from the system:

    http://www.bbcboards.net/mercury-3-l...r-present.html


    Dual Mercury Master Technician- for Mercury Outboards, Racing & Mercruiser Sterndrives in Greenville, SC.
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  6. Member acslayer's Avatar
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    #5
    my mechanic is working on getting me a cap assembly
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  7. Member acslayer's Avatar
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    #6
    so I replaced the $70 cap/float assembly and just got back from the river where I backed it in and purged the system. Went just like you all said it, fired it up, loosened the cap and waited for oil to start coming out. When I got home I thought I would test the leak. I trimmed the engine up and let it set...OIL STILL STARTED coming out. So I tightened the cap to the max where I couldn't turn it any more and let it set again. Still leaking. I didn't see any cracks on the tank so i guess I will remove the cap and look closer. Any ideas? I leave next Friday for vacation.
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  8. Member acslayer's Avatar
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    #7
    nope, no cracks. damn, now what?
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  9. Member acslayer's Avatar
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    #8
    so I put a band aid on it for now. I put some teflon pipe tape on the tank and tightened down the cap again. And yes the cork o-ring was in the new cap and still is. So far it isn't leaking but something must be wrong still right? This probably means I didn't need a new cap either. I'm going to let it set in the normal trimmed up travel position for this afternoon and see if any oil comes out again.
    Last edited by acslayer; 06-02-2012 at 10:42 AM.
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  10. Mercury - 3 Liter Moderator EuropeanAM's Avatar
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    #9
    The CAP is not the only potential leak point.

    Have you physically WITNESSED leakage from the new cap?

    What steps did you take to clean the lower cowlings and engine of all the oil residue from PREVIOUS leakage?


    Dual Mercury Master Technician- for Mercury Outboards, Racing & Mercruiser Sterndrives in Greenville, SC.
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  11. Member acslayer's Avatar
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    #10
    Yes I seen the leak, same spot. Dead cednter under the cap. There's a good pic of the original leak where you can see the trail of oil. When I trim the motor up and let it set it starts coming out, slowly, but still comes out.
    To clean the engine up I used degreaser in a spray bottle and rags. Even used a small flat screw dricer to get the rag in the tight spaces. Its cleaner than when I bought it now. Haven't cleaned the cowl yet.


    W
    Quote Originally Posted by EuropeanAM View Post
    The CAP is not the only potential leak point.

    Have you physically WITNESSED leakage from the new cap?

    What steps did you take to clean the lower cowlings and engine of all the oil residue from PREVIOUS leakage?
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  12. Mercury - 3 Liter Moderator EuropeanAM's Avatar
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    #11
    You should not have to apply teflon tape to the threads of the oil tank to get it to seal properly.

    It sounds as though there is a problem with the oil tank itself, that may be preventing the cap from sealing properly.


    Dual Mercury Master Technician- for Mercury Outboards, Racing & Mercruiser Sterndrives in Greenville, SC.
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  13. Member acslayer's Avatar
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    #12
    Don I do think your right. I took the cap off again and I really couldn't find any thing wrong with the neck of the tank. However for now the tape worked. I ran the boat for half a day Sunday while fishing and upon loading the boat back on the trailer I took the cowling off to look for oil on the tank. It was dry. That said I drove all the way home(about 60 miles) with the engine stowed up of course and noticed some wet oil on the area where the steering connects to the engine. I am not sure weather or not thats from the leaking prior that maybe I just didn't get cleaned off from inside the motor housing or if its new and coming from some where else.

    Any thoughts or ideas would be greatly appreciated. Leaving Friday for Leech Lake with the family, should I be concerned about the engine?
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  14. Mercury - 3 Liter Moderator EuropeanAM's Avatar
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    #13
    Suggestions:

    -Obtain some Lotrimin Athlete's Foot Spray from your local Pharmacy.
    -REMOVE lower cowlings (completely).
    -CLEAN lower cowlings, rigging tube, and all oil soaked areas with Degreaser or Detergent.
    -Allow engine to DRY COMPLETELY.
    -Spray ALL suspect areas (lines, connections, fittings, tank, etc) with Lotrimin Spray.
    -White powder will be left on all sprayed surfaces.
    -Supply water, start engine and run for 2-4 minutes (or until leak is readily apparent in powder).
    -Shut down, and ADDRESS LEAK as necessary.
    -Wash away excess powder with detergent/water.


    Dual Mercury Master Technician- for Mercury Outboards, Racing & Mercruiser Sterndrives in Greenville, SC.
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  15. Member acslayer's Avatar
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    #14
    I like the thought but I am out of time. I am going to keep an eye under the cowl and make sure oil isn't getting every where again. I will try your suggestion when I get home from my trip. Is it possible the oil tank neck warped? I still can't figure out why it kept leaking when trimmed up and put away in my garage. 2 caps, one being brand new and they both leaked but the teflon tape stopped it for now. Thanks Don for everything. Will post after fathers day when I home from Leech Lake.
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  16. Mercury - 3 Liter Moderator EuropeanAM's Avatar
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    #15
    As stated earlier, a problem (abnormality, flaw, crack) in the tank is certainly possible.

    Another strong word of caution here: Oil leaks are not just pesky little problems. Not only is oil leaking OUT (that was intended to be delivered as critical lubricant)- there is a potential that air is leaking IN at times.

    These types of problems usually do NOT end well for the engine, if not addressed immediately.


    Dual Mercury Master Technician- for Mercury Outboards, Racing & Mercruiser Sterndrives in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 38 years (learn something new every day).
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