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Too much gear oil 70 hp evinrude?

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  • Too much gear oil 70 hp evinrude?

    1980 70 hp Evinrude -- what happens if you fill the lower unit from the bottom, like you're supposed to, but you don't drain off an inch for expansion as indicated in the manual? I made this mistake and I to know if I need to get the boat back out of the water to drain off an inch of oil. It's a 32' pontoon houseboat, so it's a bit of trouble to retrieve it from the water. Don't want to do that unless I have to.


  • #2
    Re: Too much gear oil 70 hp evinrude?

    I would say you're fine. Usually enough leaks out while you are replacing the fill screw. I always fill until it comes out the vent hole, replace the vent screw, remove the oil filler and replace the fill screw. A small amount always leaks out before I can replace the vent screw.
    sigpic

    1969 Slickcraft SS170v

    In the garage:
    1996 Evinrude 115hp Rebuild in progress
    1995 Evinrude 70hp
    1997 Evinrude 70hp
    1994 Evinrude 4hp

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    • #3
      Re: Too much gear oil 70 hp evinrude?

      Had my current engine for 8 years and have never drained any out after a change and so far no problems, as stated, enough leaks out trying to get the plug in that I don't think it is a problem

      I never knew you were suppose to do that then again I never read the manual on how to change it, just always seemed pretty straight forward.
      GO IRISH!!!!

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      • #4
        Re: Too much gear oil 70 hp evinrude?

        I didn't know you were supposed to drain any out.

        As far as I am concerned a level plug is a level plug.
        Outboards, motor gearboxes and axles, or whacking great bits of industrial machinery. When the oil is level with the bottom edge of the level hole ( which on most things is also the filler ) it is at the correct level.

        How do you know when you've drained it back down an inch. Fiddle about with a bit of bent wire is the only way I can think of.

        Checked my manual... fill to the level hole and that's it !

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        • #5
          Re: Too much gear oil 70 hp evinrude?

          Been working on outboards and boats for more years than I care to think about but have never heard of draining off gear oil. If that's in a manual somewhere I'd probably have to question the reliability of the rest of that manual.....

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          • #6
            Re: Too much gear oil 70 hp evinrude?

            Originally posted by Dhadley View Post
            Been working on outboards and boats for more years than I care to think about but have never heard of draining off gear oil. If that's in a manual somewhere I'd probably have to question the reliability of the rest of that manual.....
            Me too.

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            • #7
              Re: Too much gear oil 70 hp evinrude?

              Originally posted by Dhadley View Post
              Been working on outboards and boats for more years than I care to think about but have never heard of draining off gear oil. If that's in a manual somewhere I'd probably have to question the reliability of the rest of that manual.....
              Yup. Besides that you're not filling to the top of the gearcase anyway.
              Checkmate Rebuild: http://forums.iboats.com/forum/boat-...eckmate-eluder

              “Anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge.'”

              ― Isaac Asimov

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              • #8
                Re: Too much gear oil 70 hp evinrude?

                I really doubt that the official factory service manual tells you to drain oil out after filling the gearcase. Perhaps some off-brand publication or hair-brained author decided to say that, but don't do it.

                There is an air space above the oil level to allow for heat expansion and no need to drain off any lubricant.

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                • #9
                  Re: Too much gear oil 70 hp evinrude?

                  I reckon anyone at home using the squeeze bottle method, would be impossible to fill the geas case, then get the bottom plug in without some oil escaping, also agree, never ever heard of draining some oil from case after filling.

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                  • #10
                    Re: Too much gear oil 70 hp evinrude?

                    Thanks, everyone, for chiming in. Consensus says that my oil level should be just fine as is.

                    Richard

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                    • #11
                      Re: Too much gear oil 70 hp evinrude?

                      Wow, that question was a opened can of worms.........
                      Hold my Beer...I think I`ve gotta Bite!!


                      `87 Rajun Cajun 70HP Super Dooper Looper Rude

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                      • #12
                        Re: Too much gear oil 70 hp evinrude?

                        Next time I get to the garage I will check an see what the OMC manual for my engine says on this, I am curious.
                        GO IRISH!!!!

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                        • #13
                          Re: Too much gear oil 70 hp evinrude?

                          Just checked the OEM manual for my '76 Johnson 70 HP, and it says to fill from the lower plug until oil appears in the upper hole. No mention of draining anything out.

                          -E

                          1988 Stingray 176 SVB with Mercruiser 3.0L (181 CID) - The Ghostrider

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                          • #14
                            Re: Too much gear oil 70 hp evinrude?

                            My turn,like others,I filled hundreds ,perhaaps thousands,while working for marinas,it was never talked about ,fill til it flows ,plug top then bottom.Having rebuilt many gearcases too,I know there are areas that likely dont get filled during the fill,therefore there are voids that will allowe for any expansion.Thatnks for the topic though and smooth seas

                            Comment



                            • #15
                              Re: Too much gear oil 70 hp evinrude?

                              My only question would be is where did you get this manual from and who published it ? That's the most *****in9 thing I've ever heard of.

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