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9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

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  • 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

    I have a 1987 4 stroke Yamaha, 9.9 hp. I bought it as a winter project as it is pretty beat up. I put oil in the oil pan and it just flows right out of the bottom of the lower unit. Is there anyone that can confirm that I feel the oil pan is cracked or is there something I am overlooking--thanks


  • #2
    Re: 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

    Did you buy it without running the motor?
    Is the drain plug in?
    Is the oil filter on and tight?
    Have some fun and enjoy the Great Outdoors.
    Love to fish out of Bodega Bay, California.

    Comment



    • #3
      Re: 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

      Hi Robin,

      I just got a 1987 9.9 4 Stroke that does a similar thing. It leaks like crazy when I lean it on its side. If you find anything out, be sure to post a follow up. I'll do the same.

      Grant

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      • #4
        Re: 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

        Parts diagrams here: http://www.yamaha-motor.com/outboard/parts/home.aspx

        Comment



        • #5
          Re: 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

          Originally posted by Grant Brown View Post
          I took the powerhead off and I am going to replace the seals and gasket. I should have the parts in a couple of days. If that works I will let you know. Bob

          Comment



          • #6
            Re: 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

            Originally posted by robin3547 View Post
            I took the powerhead off and I am going to replace the seals and gasket. I should have the parts in a couple of days. If that works I will let you know. Bob
            Did you also pull out the oil tank that is underneath the powerhead?

            ...Speaking from experience, I'm thinking that the oil leaking problem may lie around the oil tank (possibly from corrosion if used in saltwater)
            "Somebody put salt in the ocean to punish us boaters"
            1989 22' Bayrunner Cuddy (Aluminum)
            2002 Merc. 115 Saltwater Series Fourstroke
            1988 Yam. 9.9 High Thrust Fourstroke
            1998 Dodge 2500/ 24V. Cummins diesel

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            • #7
              Re: 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

              Well I fired mine up on the weekend and holy s**t did it start puking oil!

              I already bought an older Honda 4 stroke that has no issues so I put the Yam on craigslist and sold it as a parts motor to the first guy who looked at it.
              Problem solved...

              Comment



              • #8
                Re: 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

                Originally posted by sdsaw View Post
                Did you also pull out the oil tank that is underneath the powerhead?

                ...Speaking from experience, I'm thinking that the oil leaking problem may lie around the oil tank (possibly from corrosion if used in saltwater)
                I am going to give that idea a test . I will pour some oil into the pan up to just below the powerhead mount, if it leaks, then thats the problem . If it does not then it was the power head gacket. thanks and I will let you know-Bob

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                • #9
                  Re: 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

                  Originally posted by Grant Brown View Post
                  Well I fired mine up on the weekend and holy s**t did it start puking oil!

                  I already bought an older Honda 4 stroke that has no issues so I put the Yam on craigslist and sold it as a parts motor to the first guy who looked at it.
                  Problem solved...
                  Where was the oil puking from? Mine is leaking out of the prop exhaust port-thanks Bob

                  Comment



                  • #10
                    Re: 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

                    Originally posted by sdsaw View Post
                    Did you also pull out the oil tank that is underneath the powerhead?

                    ...Speaking from experience, I'm thinking that the oil leaking problem may lie around the oil tank (possibly from corrosion if used in saltwater)
                    You hit the nail on the head, I poured a cup of oil into the pan and out it comes.

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                    • #11
                      Re: 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

                      You were right--Does the lower cowl have to come off to get the pan out?-thanks

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                      • #12
                        Sign up today
                        Re: 9.9 Elth-1987 4 Stroke Yamaha-leaks Oil

                        Originally posted by robin3547 View Post
                        You were right--Does the lower cowl have to come off to get the pan out?-thanks
                        No, the pan lifts out the cowl which is one piece.
                        In fact, you have to remove the oil tank to remove the cowl!
                        If that makes any sense

                        Here are some pictures of the old parts that got replaced on mine.
                        Be prepared to spend some $$ on new parts, seals and gaskets.
                        I spent $700+ back in 2001
                        The factory repair manual is a must (#LIT-18616-FT-99) which is for my 1988 FT 9.9ELG

                        Top view of the mid-section



                        Upright view of the oil tank assembly
                        When viewing from the top, you will have to remove the bolts around the perimeter (maybe 6?)
                        The bolts that are towards the middle, hold the oil tank to the powerhead base plate


                        Upside down view of oil tank assem.
                        The left threaded hole is the oil drain
                        The large right hole is for the stainless exhaust tube which runs up the middle of the tank
                        The rubber grommet in the lower right is for the cooling water tube
                        Since your oil leaks out so quickly, I suspect the problem to lie in this area.




                        I attempted to repair my old oil tank by welding and JB Weld (to fill where it couldn't be welded) but decided to buy new replacement parts instead



                        Here's a parts breakdown of the parts
                        Look at the "upper casing"
                        http://www.yamaha-motor.com/outboard/parts/home.aspx

                        Good luck,
                        Scott
                        "Somebody put salt in the ocean to punish us boaters"
                        1989 22' Bayrunner Cuddy (Aluminum)
                        2002 Merc. 115 Saltwater Series Fourstroke
                        1988 Yam. 9.9 High Thrust Fourstroke
                        1998 Dodge 2500/ 24V. Cummins diesel

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