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Hurth transmission leak?? Pls help!-gctid818933

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    Hurth transmission leak?? Pls help!-gctid818933

    Am out for a 10 day cruise on our 1987 38 with 175 hinos and hurth transmissions and I open the lazzarette and find a small spray of tranny fluid coming off the shaft as it comes out of the transmission. I can feel a small amount of fluid on the bottom of the tranny as well so it could be coming from anywhere.

    It is only a small amount from a 4 hour cruise at 1500 rpms. Fluid level in tranny the same as when I started. No cooling issues.

    Any thoughts? Any issues to leave this until we get back? Have about 15 more hours of run time before we get home.

    Thanks!!
    Craig
    Nanaimo bc
    1987 bayliner 3818
    w/ 175 Hinos no Genny, but solar to run everything!
    10ft Livingston with centre console and 15hp on davits / winch

    #2
    If you are sure there is no extra fluid and its not whiter or foaming you likely have a shaft seal leak.

    Make sure it stays topped up for the balance of the trip and maybe fabricate a temporary 'slinger' cover to keep the spray going down only.

    I have had good luck turning plastic gallon bottles into temporary slinger covers in the past.
    Northport NY

    Comment


      #3
      Thanks smitty! Will do.
      Craig
      Nanaimo bc
      1987 bayliner 3818
      w/ 175 Hinos no Genny, but solar to run everything!
      10ft Livingston with centre console and 15hp on davits / winch

      Comment


        #4
        I'm curious of the spray. Is this a spray under pressure or tranny fluid flying around from the turning shaft? Aren't all the Hurth's vented so the tranny doesn't build up any pressure? I know my Hurth 360a's on my gas drives had vents that were totally plugged. The spray was coming out of the filler/dipstick under the crush gasket on both transissions and was making one hell of a mess. I yanked both vents and couldn't even blow thru them, cleaned them out and no more mess in the bilge.
        Dan
        Frostbite Falls, Minnesota
        Claudia V. III
        1988 - 3218
        Gas Drives

        Comment


          #5
          Breather clogged by paint or dirt

          or Shaft seal faulty
          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


            #6
            +1. Double ck the vent is not plugged then do as Smitty recommends.
            Jim Gandee
            1989 3888
            Hino 175's
            Fire Escape
            [email protected]
            Alamitos Bay, SoCal

            Comment


              #7
              Thanks all, got back from

              The trip with minimal leakage. Am back at the boat next week and will check the vent.

              Have to pull the manual to see where it is. Any tricks to removing it?
              Craig
              Nanaimo bc
              1987 bayliner 3818
              w/ 175 Hinos no Genny, but solar to run everything!
              10ft Livingston with centre console and 15hp on davits / winch

              Comment


                #8
                I kind of F'ed mine up taking them out. One came out and the other was stuck. My transmission is a Hurth 360a. They don't make the 360a's anymore.

                Here is a picture of the good one. It had a grove on the bottom for a O ring or metal clip. Which means they were probably fastened from inside the transmission.




                Attached files

                Dan
                Frostbite Falls, Minnesota
                Claudia V. III
                1988 - 3218
                Gas Drives

                Comment


                  #9
                  Good chances the spray comes from leaking fluid at the rear seal and being centrifugated by the turning shaft. Easy fix by removing the coupler and pulling out the old seal (use small sharp screw driver to tear it off) and smoothly and evenly pushing a new one in.
                  NILE
                  1989 3288MY 305's US Marine
                  Fort Lauderdale Florida

                  Comment


                    #10
                    Took out one vent plug and the other is stuck. Are these supposed to just pull out? How much force do you have to use? As well the one I got out was plugged. Do they breather from under the mushroom cap top?
                    Craig
                    Nanaimo bc
                    1987 bayliner 3818
                    w/ 175 Hinos no Genny, but solar to run everything!
                    10ft Livingston with centre console and 15hp on davits / winch

                    Comment


                      #11
                      Floatyerboat, mine has the same grove. Think it is an internal c clip or spring hold.
                      Craig
                      Nanaimo bc
                      1987 bayliner 3818
                      w/ 175 Hinos no Genny, but solar to run everything!
                      10ft Livingston with centre console and 15hp on davits / winch

                      Comment


                        #12
                        Sorry I was on the boat all day. Yes they breath from under the mushroom. On the second tranny I couldn't get it to pop out but the mushroom cap came off so I cleaned the stem in place and just laid the cap back on the stem and it hasn't come off yet. I wanted to say c clip but the name just wouldn't pop into my head. I twisted a drill bit down through the stems but be careful so you don't drop it. Hopefully its a thin brass c clip and it dropped to the bottom. Either way the burping under the filler cap is gone now. HS design.

                        There was a lot of dried crud that came out of there.
                        Dan
                        Frostbite Falls, Minnesota
                        Claudia V. III
                        1988 - 3218
                        Gas Drives

                        Comment


                          #13
                          Floatyerboat,

                          Anyone pls correct me if I am wrong, but believe these breather valves were made to be taken out and put back in without taking the tranny off.

                          Simple push fit.
                          Craig
                          Nanaimo bc
                          1987 bayliner 3818
                          w/ 175 Hinos no Genny, but solar to run everything!
                          10ft Livingston with centre console and 15hp on davits / winch

                          Comment


                            #14
                            When I pulled my two vents I realized there was a C ring holding them in place from the inside and wasn't about to pull the transmission to replace the C-ring that probably dropped down inside so after cleaning I dropped the vent back in the hole it came out of and I haven't had any trouble with popping out in 2 years. Put them back in and forget about it. I'd just check it every so often. I found the Hurth 360a and 450 manual online and I will post it here. At the bottom of the manual in the parts list the vent is part # 76. On the diagram it shows part 76 but not how it fastens to the transmission. I was thinking maybe it would be easier to leave them unfastened so every spring they could be pulled and cleaned.

                            Sorry it wont upload the pdf. Please private message me and I will email it to you.
                            Dan
                            Frostbite Falls, Minnesota
                            Claudia V. III
                            1988 - 3218
                            Gas Drives

                            Comment


                              #15
                              Thanks, got the manual as well, just having difficulty getting the replacement vent. Where did you get yours?
                              Craig
                              Nanaimo bc
                              1987 bayliner 3818
                              w/ 175 Hinos no Genny, but solar to run everything!
                              10ft Livingston with centre console and 15hp on davits / winch

                              Comment

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