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Slight Oil Leak F115

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  • #1

    Slight Oil Leak F115

    I have a 2002 F115 with 1450 hours on it.

    The last time I used the motor I could smell a hint of burning oil. I checked under the cowl and found some traces of oil on the bolt heads on the starboard side of the power head. I have checked under the flywheel and it is completely dry.

    There is barely a hint of oil in the lower pan and engine oil level if fine.

    Not sure where else it could be coming from . Is there any chance it could be leaking from the seal on the dip stick ? When checking the oil level it does not feel that tight where it seats.

    Thanks in advance

    JON
    Tags: None
  • #2
    It's possible to have some blow by seep out the filler tube...

    That seal should be pretty cheap (simply replace it and eliminate the potential problem).

    If it continues;

    I'd clean (de-grease) any oil residue and monitor. A spritz of baby powder will stick to any fresh oil residue.. Might show up quickly, might be awhile.


    *I bought a car with a Dodge slant six decades ago that blew oil out the filler hole, (approx 5 quarts in 20 miles-BAD). Cleaned as noted above and found that leak(dip stick hole)-engine ran great.

    Yanked the engine, turned out pistons rings were EXTREMELY WORN (1/4" ring end gap). Compression was blowing past the rings, into the crankcase, then out the filler hole. Re-ringed, BIL drove it for YEARS afterwards, no leaks, oil burning, etc...

    Should your rings be worn badly, it'd do the same.. A leak down test, would pin point that down real quick...
    Last edited by TownsendsFJR1300; 10-20-2017, 06:40 AM.
    Scott
    1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR

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    • #3
      no do a compression test first. what a waste of time. I cannot belive someone mentioned a leakdown test.
      but there is babypowder and NAPA sells a compound that floureces under a black light for leak detection.

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      • #4
        Originally posted by rodbolt17 View Post
        no do a compression test first. what a waste of time. I cannot belive someone mentioned a leakdown test.
        but there is babypowder and NAPA sells a compound that floureces under a black light for leak detection.

        Why a compression test??

        Why NOT a leak down test if that seal is NOT the issue??


        With a leak down test, you'd hear air in the crankcase and see the actual health of the internals of the engine.

        I do them all the time(leak down)..

        Saves a BUNCH of time, even on the two strokes...

        An early 1980's, two stroke Mcculloch chain saw leak down test:



        Compression test, same engine:



        You could hear air come out the carb BIG TIME with the leak down test (motor was toast)
        Last edited by TownsendsFJR1300; 10-20-2017, 08:54 AM.
        Scott
        1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR

        Comment

        • #5
          I am sure Rod was just jacking around.
          He is the one that always tell us the compression test are a waist of time.

          You happened to say leak down test before compression test so he had to jack with it

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          • #6
            Originally posted by 99yam40 View Post
            I am sure Rod was just jacking around.
            He is the one that always tell us the compression test are a waist of time.

            You happened to say leak down test before compression test so he had to jack with it
            Apparently Rod is in a jacking around mood today....

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            • #7
              It's Friday!
              Scott
              1997 Angler 204, Center Console powered by a 2006 Yamaha F150TXR

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