Mercruiser starter.

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  • June 4, 2015 at 9:43 am #1677
    rickinfarmington
    Participant

      I just installed a new Mercruiser starter on a 165 six cylinder Mercruiser. The new one is an updated unit that is smaller in size than the original. It functions normally, with the exception of a rather loud noise coming from the starter. Removed and inspected it and could find nothing wrong that would explain the strange noise. Anyone out there replaced their starter lately?

      rickinmaine

      June 4, 2015 at 10:58 am #17572
      jerry-ahrens
      Participant

        US Member

        I have a 165 that I put one of the new smaller starters on. What kind of noise do you have? Maybe the flywheel has some bad teeth on it?

        June 4, 2015 at 11:23 am #17576
        wiscoboater
        Participant

          I just replaced mine last weekend. Other then a more "high pitched" sound from the smaller starter it seems normal. This was on a Mercruiser 898. Is it a grinding? or does it sound like the starter gear is dragging on the flywheel teeth? You may need to do a little shimming of the mounting points if that is the case.

          June 4, 2015 at 11:40 am #17579
          rickinfarmington
          Participant

            It must be related to the engagement of the starter drive gear and the flywheel teeth. I will try shims under the starter mounting points. Other than that, there is nothing else to tweak. thanks for the ideas.

            June 4, 2015 at 11:50 am #17580
            Michael
            Participant

              International Member

              Might want to check the tooth count on the new starter and make sure the same as the old. If different, the starter teeth will not engage properly with the flywheel teeth and that could make it noisey

              June 4, 2015 at 12:52 pm #17583
              theodore
              Participant

                The "smaller" starters have gears within the starter. That’s the "different" noise you’re hearing.

                June 4, 2015 at 1:16 pm #17584
                rickinfarmington
                Participant

                  Hmmmm, That thought occurred to me. Perhaps when I replace the engine cover, the noise won’t be as pronounced. The gears are obviously engaging as it does start the engine just fine. Biggest concern is damaging the starter. Guess I better pull it one more time to check the tooth count and try the shims at the same time. This engine is installed in a vintage Wellcraft and the access is very limited. thks again.

                  June 5, 2015 at 12:40 am #17617
                  jerry-ahrens
                  Participant

                    US Member

                    I can tell you that they don’t sound the same as the original. It should give a nice fast turnover of the engine.

                    June 5, 2015 at 7:29 pm #17658
                    rickinfarmington
                    Participant

                      I have yet to pull the starter again. The fact that the starter doers turn the engine over, must indicate that the tooth count on flywheel and starter at the same. Seems hard to believe I have to shim the starter motor, but the loud noise it makes, has me thinking that once the starter motor engages the flywheel, there is a side load on the starter shaft. The Merc part number for this starter is: 50-806965A4 and the enclosed paper work clearly states, it will fit the in line 6 cylinder engine models. Does anyone out there know of a different part number? I am perplexed..

                      June 5, 2015 at 7:48 pm #17659
                      rickinfarmington
                      Participant

                        Been on line troubleshooting my problem. I have found references to three different sizes for the flywheel. 12 3/4, 12 5/8, and 12 7/8. Now I need to find out what size I have by doing a search on engine SN. That being said, I could not find any other Mercruiser part number for the in line 6 cylinder engines.
                        Some how I am thinking that I have a starter designed to engage a 12 5/8 flywheel, but my engine may have a 12 3/4 inch flywheel. While the starter may engage, it would make a hell of a racket being that it is more or less jammed into the flywheel teeth.

                        This make any sense to anyone??

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