Announcement

Collapse
No announcement yet.

Bent shaft advise; B O A T (bust out another thousand) is taking effect.

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

    #16
    when I removed the shafts on my 45, the 'bend' was on the tapered part of the shaft...makes sense, since this is the thinnest part of the shaft. think I remember .013" was the max allowed allowance? In my case the couplers also showed elongated mounting holes, so must have been a hard strike! After we replaced shafts and couplers we aligned on the hard, and then mechanic had us check again in the water...It was different as previous poster noted. Mechanic also said he would compensate for 'under load' torque when he aligned shafts...made sense, considering shafts only 1.5" and fairly long. My vote would be to replace vs try to straighten shafts...also check strut alignment and cutlass bearings... good luck

    Comment


      #17
      As a rule of thumb,
      max runout tolerance should be .002"... better to be lower than that.
      Joon, Kathy, Jaden & Tristan
      Uniflite 42 AC, DD 671N
      93 3058 sold
      92 2855 (day boat)
      91 Fourwinns 205 (lake boat)
      Longbranch WA
      Life is Good

      Comment


        #18
        One too many zeros Joon you think ?

        Be good, be happy, for tomorrow is promised to no man !

        1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

        '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

        Manalapan N.J

        Comment


          #19
          In my limited knowledge of shaft run out I was under the impression the desired limit was two thousandths, .002”. I believe Joon is correct.
          Jim Gandee
          1989 3888
          Hino 175's
          Fire Escape
          Fyrflyer@ca.rr.com

          Comment


            #20
            Everywhere I've looked indicates .002 - .003 is the acceptable range.
            Future 4788 Owner
            Charleston, S.C.

            Comment


              #21
              For what it's worth, here's a link to a table of industry standards for new shafts. I would think repaired would also be within a few thousandths.

              http://www.pacificmarine.net/enginee...nce-tables.htm

              Note that the roller type supports are 2" from each end. Given that location on a ten foot shaft the rotation of the shaft on the rollers needs to be slow so that the shaft is allowed to flex between the supports. I read the Industry Standard for a ten foot shaft to be .00155 and the standard increases with length. If I were to measure a shaft, just being me, I'd baseline the measurements with the 2" from each end supports, then measure again with the shaft supported at 1/3 the length from the end. Or, within the coupler overlap and the center of the cuttlass bearing.

              P/C Pete
              Edmonds Yacht Club (Commodore 1993)
              1988 3818 "GLAUBEN”
              Hino EH700 175 Onan MDKD Genset
              1980 Encounter Sunbridge "Misty Blue" (Sold)
              MMSI 367770440
              1972 Chevrolet Nova Frame off Resto-mod in the garage
              Boating on the Salish Sea since 1948

              Comment


                #22
                My attempt at humor, hope Joon understood that.

                my post 8 thousands is what I meant, probably he's right .

                researched where the 8 thousand number stuck in my mind.

                mercruiser number .

                lesson to be learned, verify, verify, verify, don't trust what you read on a free forum. Including what da Chief writes.

                happy new year folks.
                Be good, be happy, for tomorrow is promised to no man !

                1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

                '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

                Manalapan N.J

                Comment


                  #23
                  Alen, yes I understood my friend... one too many zeros.
                  Joon, Kathy, Jaden & Tristan
                  Uniflite 42 AC, DD 671N
                  93 3058 sold
                  92 2855 (day boat)
                  91 Fourwinns 205 (lake boat)
                  Longbranch WA
                  Life is Good

                  Comment


                    #24
                    I drove to the prop/shaft shop and spoke to the the man that actually works on the shaft. He said if I change to a convential shaft at the engine end it will save time and money. All I would ahve to do is change the coupling that is on the shelf. My current shafts are metric. He said I could save as much as $1,000. The shaft office sent a new estimate to my project manager who called me with the new amount. $40 lower estimate. I don't get it? Now I have to wait for next year (Wed) to discuss the differences.

                    Comment


                      #25
                      I'm betting it has to do with changing the transmission half of the coupler.
                      P/C Pete
                      Edmonds Yacht Club (Commodore 1993)
                      1988 3818 "GLAUBEN”
                      Hino EH700 175 Onan MDKD Genset
                      1980 Encounter Sunbridge "Misty Blue" (Sold)
                      MMSI 367770440
                      1972 Chevrolet Nova Frame off Resto-mod in the garage
                      Boating on the Salish Sea since 1948

                      Comment


                        #26
                        Yikes. .030 is a lot of runout, you could see that with the naked eye.
                        Is there a way to measure runout while the boat is in the water?
                        A cheap Enco or harbor freight $20 indicator that would be one time use after it got soaked in salt water?
                        Esteban
                        Vancouver, BC
                        Former Bayliners 3218, 2859, 2252, 1952

                        Comment


                          #27
                          The alignment should always be checked after the boat has been it the water, preferably after 24 hours.
                          Pat says: DO-IT-RIGHT THE FIRST TIME!

                          Bayliner 3870 "ALASKA33)
                          Twin 350 GM power
                          Located in Seward, AK
                          Retired marine surveyor

                          Comment


                            #28
                            Word from the shaft shop - the $1,000 savings would be on the next shaft replacement. The next replacement will have common ends and ,thus, cost less. I get the feeling my chain is being pulled.
                            I authorized the replacement without the metric end. New couplings were also purchased. I did save $106 by recycling the old shafts and couplings.

                            Comment

                            Working...
                            X