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Changing piston ring in 87 115 Evinrude

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  • Changing piston ring in 87 115 Evinrude

    I have low compression in one cynlinder and would like to replace piston ring and hone cylinder. Is this something I can do myself? I have some mechanical ability, but would need some advice on how to do this.

  • #2
    Re: Changing piston ring in 87 115 Evinrude

    Get a copy of OEM shop manual to see what's involved.
    Jim

    ===============================
    I don't respond to Private Messages PM's that are motor questions.

    For basic information on a wide range of topics, see Top Secret File
    Link: http://forums.iboats.com/showthread.php?t=299680

    OEM shop manual: outboardbooks.com or Ebay

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    • #3
      Re: Changing piston ring in 87 115 Evinrude

      What are the comp readings just so we know what we are working with? And there is more to it than just doing one ring, if you are going to the work of re and reing the powerhead plan on doing everything else, all the rings, maybe bearings, a full gasket set.
      sigpicSignature- If you have fuel and spark- Have you checked compression?

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      • #4
        Re: Changing piston ring in 87 115 Evinrude

        I agree with the total rebuild suggestion,because,the whole engine needs to be torn down to machine 1 cylinder,you will get grit and all kinds of crap through the engine by trying to "sneek "out 1 piston,which still requires you to split the crankcase,at that point your 1/2 there

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        • #5
          Re: Changing piston ring in 87 115 Evinrude

          Mike is right on. No point in installing one new ringset only to run the possibility that one of the other old ones fails a month later-and your are into another complete teardown. These crossflow carbed engines are not complicated. Armed with the factory service manual and some resolve, you can get through it.

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          • #6
            Re: Changing piston ring in 87 115 Evinrude

            How low is the compression? If decarbing doesn't help, I doubt that you'll get by with just a hone and ring job. You'll be boring and putting in an oversized piston....
            Alias "schematic"

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            • #7
              Re: Changing piston ring in 87 115 Evinrude

              There is about 50 lbs of pressure in the #1 cylinder and a good 100 lbs in the rest. I believe it might be from the previous owner running the mix too lean. The motor has seen better days and I guess I was hoping to squeeze just a little more life out of it.
              Thanks for all the advice at least I have a few months to think it over.

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              • #8
                Re: Changing piston ring in 87 115 Evinrude

                Or a few months to rebuild it
                sigpicSignature- If you have fuel and spark- Have you checked compression?

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                • #9

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                  • #10
                    Re: Changing piston ring in 87 115 Evinrude

                    unless you just want to rebuild the motor, I would buy a good used one, seems to be plenty of them out there
                    Free ignition troubleshooting guide http://www.cdielectronics.com/techni...ort-documents/
                    You will need a DVA adapter http://www.usatoolwarehouse.com/usat...e/ESI-640.html First test compression, Second test spark with a spark gap tester set a 7/16 gap, Third check timing, next CLEAN your carbs properly,

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                    • #11
                      Re: Changing piston ring in 87 115 Evinrude

                      forget the Clymer and Seloc, it was mentioned way back to buy a genuine (OEM) manual, you are going to need it, one cylinder will not be low compression from running the oil mix too lean, it may be from a lean burn from a dodgey carby, or something, but oil mix NO! you will need to be a bit more than "handy" as a mechanic to get this motor up and running as good as new, but it is not beyond the scope of a patient and skillful home mechanic who has the genuine manual and is prepared to follow it, and listen to advice from here without cutting corners.

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                      • #12
                        Re: Changing piston ring in 87 115 Evinrude

                        cutting corners can really sux
                        Free ignition troubleshooting guide http://www.cdielectronics.com/techni...ort-documents/
                        You will need a DVA adapter http://www.usatoolwarehouse.com/usat...e/ESI-640.html First test compression, Second test spark with a spark gap tester set a 7/16 gap, Third check timing, next CLEAN your carbs properly,

                        Comment


                        • #13
                          Re: Changing piston ring in 87 115 Evinrude

                          You need the original factory manual from the original publisher, Ken Cook Co. in Milwaukee. 414-466-6060. Call them, give them your credit card and they will ship it out to you.

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                          • #14
                            Re: Changing piston ring in 87 115 Evinrude

                            Okay, I just finished putting my first 10 hours on the re-build. I took everyone's advice, i.e., getting the OMC shop manual and doing the complete engine. It turned out once I got into the powerhead I found a lot of additional problems such as scored cylinders, broken rings, and worn pistons. It took a lot of time and patients, and some help from the local marine machine shop, but to my surprise it runs great. Thanks to everyone for helping me out.

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                            • #15
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                              Re: Changing piston ring in 87 115 Evinrude

                              Wowsers, that has to be a post record, an actual reply to a message from 10 months ago, bravo on your rebuild
                              sigpicSignature- If you have fuel and spark- Have you checked compression?

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