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1988 Force 85HP prop

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  • 1988 Force 85HP prop

    Will any 15 spline prop of the correct size fit?
    I'd like to get a Hustler prop
    http://boatpropellers.iboats.com/Sea...&rotation=Both

    Though it says hub kit 30, I believe my engine takes hub kit 102
    Basically what I need to know is if I find a stainless steel 13x15 or 13x17 prop on for sale how do I know if it will fit my engine?

    Thanks


    *edit*
    kit 30 is Turning points MasterGuard hub kit part # for use with their Hustler prop
    kit 102 is Michigan wheels universal prop kit interchangeable with other hub systems.


  • #2
    Re: 1988 Force 85HP prop

    Would just like to know if I can make any 13 x 15, 13 x 17 prop work if its meant for 15 spline.

    Comment



    • #3
      Re: 1988 Force 85HP prop

      Some props will fit BUT you really need to know what you are doing! Mercury props were 15 spline and some 'Rude props are also.

      The earlier Force engines before 1990 used a single exhaust lower unit. Although the shaft and splines were the same as Mercury, the gearcase was smaller. I think 4 1/4 versus 4 1/2 diameter. Although the hub (not the internal rubber hub, the actual cast hub the blades are attached to) of the prop is the same diameter, the flange that fits into the gearcase of the Mercury is larger and will not go. NOW: If you wanted to cut off that flange, then the prop would fit. Since you do not have thru-hub exhaust, removing the flange will do no harm. However, it is a bit of fuss.

      You can use either a closed hub prop, or an open hub prop designed for thru-hub exhaust.

      Adding to the confusion, some years and sizes of Mercury engines had the same gearcase diameter as the Force.

      So you can not just jump at a prop. You need to ask questions and measure first. In addition to 15 splines, the flange diameter you need is 3 5/8. The overall hub length of a closed hub prop needs to be 4 3/8 without the flange and 4 7/8 including the flange.

      Comment



      • #4
        Re: 1988 Force 85HP prop

        Thanks for the info, that is interesting.
        Can you help me find one that fits?

        I want to buy one of these Hustler props, and found a 15T that fits a Mercury 90HP with 4-1/4 gear case.
        Will this fit an 1988 Force, 85HP ?
        http://boatpropellers.iboats.com/Sea...&rotation=Both

        Of maybe you know some other year model propellers that will work on a 1988 Force 85HP and I can cross-reference them.

        Thanks for all the help

        Comment



        • #5
          Re: 1988 Force 85HP prop

          As Frank tried to tell you, the hub size is the controlling factor. I have found that all of the non exact replacement aftermarket props have larger hub sizes than the force lower. That means that they won't fit inside the hub so you can't get the nut on. You can cut the flange down but then you get into all sorts of other problems.

          Stick with a Michigan replacement 13x19 or 13x17 or buy a newer engine.

          John
          sigpic

          Regards,

          John

          Comment



          • #6
            Re: 1988 Force 85HP prop

            If you are interested, I will have a stainless Michigan Wheel 13X17 prop come available in the very very near future. I just repowered my boat and will be parting out my 1984 Chrysler 75. If you are interested PM me.

            Comment



            • #7
              Re: 1988 Force 85HP prop

              before buying a new prop I'd go check out some local marinas. I got a rebuilt 13x17 for $50 it looks new. They had a bunch of different ones for that price.
              2011 crestliner superhawk 1700 with a merc 115 EFI fourstroke

              Comment



              • #8
                Re: 1988 Force 85HP prop

                Originally posted by john from md View Post
                As Frank tried to tell you, the hub size is the controlling factor. I have found that all of the non exact replacement aftermarket props have larger hub sizes than the force lower. That means that they won't fit inside the hub so you can't get the nut on. You can cut the flange down but then you get into all sorts of other problems.

                Stick with a Michigan replacement 13x19 or 13x17 or buy a newer engine.

                John

                Thanks John.
                So what hub size does the '88 Force 85HP have exactly, and do you know of any other props for different engines that fit?

                Will older Chrysler props work with this engine?

                Comment



                • #9
                  Re: 1988 Force 85HP prop

                  By the way Frank, the prop selector at iboats says the 1988-1989 is dual exhaust, so it requires a prop with through-hub exhaust.

                  Is there much difference between the Michigan Wheel Match, and the Michigan Wheel Vortex?
                  The match is twice the price.


                  Thanks

                  Comment



                  • #10
                    Re: 1988 Force 85HP prop

                    ....

                    Comment



                    • #11
                      Re: 1988 Force 85HP prop

                      Do y'all think a Turning Point Hustler prop H1-1317 will fit this engine if I use a Michigan hub kit # 102 or Master Guard 30 from Turning Point.
                      The Turning Point hub kits and the Michigan hub kits are interchangeable.

                      I've been searching for HOURS trying to figure this out.

                      HERE'S THE DEAL:
                      I found a Michigan Vortex part # 992114 that fits a 90HP Honda (15 spline) that fits the 1988 Force 85HP due to the hub interchange system.
                      The prop finder ALSO SHOWS that Honda 90HP has a HUSTLER PROP available with interchangeable hub, part # H1-1317 so if it is like the Vortex prop it should fit (if I'm lucky).

                      So if the same part # Vortex is listed for both engines, wouldnt that Hustler prop fit my motor with a hub kit?



                      Opinions, please!

                      Comment



                      • #12
                        Re: 1988 Force 85HP prop

                        Also contact Fairwinds Marina in Annapolis, MD. They have a lot of Chrysler/Force stuff. They helped me with a prop before, and can tell you exactly what you need.

                        Comment



                        • #13
                          Re: 1988 Force 85HP prop

                          You need to slow down and take a deep breath.

                          First, you can't mx apples and oranges. Even if you find a prop for a johnyrude engine that says it has 15 splines and is 13x91, the shaft size may not be compatable.

                          The lip on the front of a propeller for a Force 85 is about 3.65 inch diameter. It may be a tad bigger as I had to use a six in caliper to check it. This means it has to fit into the hub of the 85 hp engine the inside diameter of which is less than the prop lip.

                          Most of the newer props in this horsepower size have larger hubs and won't fit the Force engine.

                          If you want to look through some props to see the differences, go to a boat salvage yard with your prop in hand and you can see for yourself. You might be able to call Michigan Propellers and ask them but I don't think they will give you anymore info than is on their website.


                          John
                          sigpic

                          Regards,

                          John

                          Comment



                          • #14
                            Re: 1988 Force 85HP prop

                            I'm going to order the Hustler 13-1/4 x 17 aluminum prop with a Master Guard hub kit # 30 (15 spline) and hope for the best. If all else fails I'll get a boring old tech Michigan prop and I'll already have an interchangeable hub kit.

                            Comment



                            • #15
                              Re: 1988 Force 85HP prop

                              Be sure to let us know how you make out.Could be valuable future reference.

                              Comment

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