3 1/2 HP Firestone

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  • April 5, 2021 at 12:38 pm #235700
    Mrelmo
    Participant

      I have a 3 1/2 hp firestone that has not been started since maybe the early 60s. I thought that the powerhead was seized up. So I pulled the head off and the piston will move a quarter of an inch freely. And I can hear a clunk in the lower unit when I do that. So I am thinking there is a frozen bearing maybe in the lower drive train maybe any thoughts before I separate the motor from the drive unit. Also when I move the throttle lever it is tight to move. And I don’t want to just spray wd40 or any lube blindly.

      • This topic was modified 4 years, 7 months ago by Mrelmo.
      April 5, 2021 at 1:56 pm #235704
      frankr
      Participant

        US MEMBER PAY BY CHECK

        So you are convinced the clunk is from the lower unit??? If it is, remove the cap from the front of the lower unit to see what’s going on in there. But you also say that the throttle lever is tight to move. That makes me wonder if the lockup problem is something came loose under the flywheel. It is very likely that it will need ignition service anyway, so pulling the flywheel for a looksee isn’t going to be wasted effort.

        Removing the powerhead isn’t going to resolve anything.

        April 5, 2021 at 2:40 pm #235706
        Mrelmo
        Participant

          Hmmmmmm ok tomorrow I will seperate the lower unit where the water pump and see what that looks like. I have to do a little research to see how the fly wheel comes off

          April 6, 2021 at 8:32 am #235743
          Mrelmo
          Participant

            Will I need a puller to get the flywheel off and is the nut a standard right hand thread?

            April 6, 2021 at 12:14 pm #235773
            Mrelmo
            Participant

              OK the issue is the lower unit. I pulled the front cover off where you fill with lube, the prop shaft is frozen to the front cover (when the cover came off there was nothing but dust). The motor was still seized, so I pulled the mid section out and the motor turns freely. However the main shaft is seized to the midsection. So both gears need to be replaced. the shafts appear to be in good shape, but I am having a hard time trying to get the gears off the prop shaft and main shaft. Are these gears available and how do they come off the shafts.

              April 6, 2021 at 1:19 pm #235780
              frankr
              Participant

                US MEMBER PAY BY CHECK

                They made about a trainload of those motors, so there are used parts out there. Figure out what you need and post a want ad on this website. The ad is free.

                April 6, 2021 at 2:08 pm #235786
                Mrelmo
                Participant

                  will do I am new to this site is there a section for ads or just start a new thread on this location thank you

                  April 6, 2021 at 2:12 pm #235787
                  dave-bernard
                  Participant

                    US Member

                    also check eBay.

                    April 6, 2021 at 2:30 pm #235788
                    frankr
                    Participant

                      US MEMBER PAY BY CHECK

                      Look at the top of the page we are on now. Click on CLASSIFiEDS

                      April 6, 2021 at 3:29 pm #235790
                      Mrelmo
                      Participant

                        Does anyone know how to seperate the gear from the bottom of the main drive shaft

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