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rebuild instructions for pre-alpha hydraulic trim pump

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  • rebuild instructions for pre-alpha hydraulic trim pump

    Is this a DIY? Help me get back on the water!


  • #2
    Re: rebuild instructions for pre-alpha hydraulic trim pump

    The warm weather is kicking in where you are. Plenty of good used units around, check E-bay or your local boat yards.To me, thats your fastest, easyest way to get back on the water.
    What exactly is wrong, mabey the guys here can help out. Go to the sticky and download the manual and have a look--its pretty involved if u ask me.
    Chris

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    • #3
      Re: rebuild instructions for pre-alpha hydraulic trim pump

      A bit vague in your discription of your pump.
      Don S.

      sigpic

      Please, no PM's (Private Messages) regarding boat/engine problems.
      That is what the forums are for.
      Only forum/moderator issues will be answered in PM's.

      Comment



      • #4
        Re: rebuild instructions for pre-alpha hydraulic trim pump

        1975 I6 165 HP Trim Pump very bad photo attached

        Symtom: High amount of fluid came out when activating pump. Black house is new and checked. looking back at it now, it would have made sense to put a mirror under pump and test to isolate leak. I did not, thinking I would find the leak upon removal. There are three holes at the bottom, One had a black hose, threaded line. The second was on a copper fitting and was a plastic hose. There was a third hole and nothing was in there and I am thinking that was some type of return.





        http://i925.photobucket.com/albums/a...t1968/pump.jpg
        Last edited by Don S; May 25th, 2010, 02:22 PM. Reason: Changed to link Photo to big. Keep to 640W max

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        • #5
          Re: rebuild instructions for pre-alpha hydraulic trim pump

          As I recall, there is only 2 lines on those pumps. Is it your original pump, or is this a replacement you picked up?
          Don S.

          sigpic

          Please, no PM's (Private Messages) regarding boat/engine problems.
          That is what the forums are for.
          Only forum/moderator issues will be answered in PM's.

          Comment



          • #6
            Re: rebuild instructions for pre-alpha hydraulic trim pump

            This is the original, and there were only two connected and when I replaced the black line two years ago I think there was only two. If that is true, what is the the third unthreaded whole for and why would fluid leak from there?

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            • #7
              Re: rebuild instructions for pre-alpha hydraulic trim pump

              and sorry for using whole instead of hole, I am not a fan of misppellings that occur on forums.

              Comment



              • #8
                Re: rebuild instructions for pre-alpha hydraulic trim pump

                One of those holes ins't a "hole". It's hard to understand but there are no threads in the casting and it doesn't go into the housing. I spent 15 minutes one time trying to thread a hydraulic line into a spot that had no threads and didn't even have an opening despit it looking that way from the side. I had to remove the pump from the floor to discover that, lol.

                Should just have one of the braided lines and the plastic line that runs up to the trim sender.
                1976 Mark Twain 200VBR w/Mercruiser 233 (Ford 351w) "Heart & Soul"

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                • #9
                  Re: rebuild instructions for pre-alpha hydraulic trim pump

                  The valve body has "O" rings for sealing.
                  NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

                  Comment



                  • #10
                    pictures help-here is the info

                    EDIT: RESIZE PICTURE TO 640W Max.

                    Connections: One at the brass elbow next to the non threaded hole and the other on the other side, which is the up or higher pressure hose. I did not see where it was leaking from, but I would have to bet it is the hole next to the brass elbow? Is that like a weep hole similar to water pumps, i.e. it leaks early and you know you need to replace?

                    If it is leaking from there, is this an easy rebuild? I would like to go the rebuild route since this motor looks in better shape than a used one and if I rebuild I know what I have.
                    Last edited by Don S; May 26th, 2010, 09:52 AM. Reason: Removed HUGE picture ...... again.

                    Comment



                    • #11
                      Re: rebuild instructions for pre-alpha hydraulic trim pump

                      http://i925.photobucket.com/albums/a...esizedpump.jpg

                      Resized photo. My sincerest apologies since I know the importance of keeping space avail and not have huge photos posted.

                      EDIT: Picture still too big. It's 1023 wide, please resize to 640 wide, or just post them as a link.
                      Last edited by Don S; May 26th, 2010, 10:31 AM. Reason: Picture to big again

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                      • #12
                        Re: rebuild instructions for pre-alpha hydraulic trim pump

                        I also have one of these pumps...1977 Starcraft Capri. I had trim problems (long story about a sand bar) and fought with it for about 1 year cause I was so new to all of this.
                        It's a Prestolite pump. looks in fairly good shape. On the bottom there is a "dog bone" held on by 4 bolts. One of the hoses connects through this dog bone. If you take it off of the pump you'll find 3 o-rings.
                        I blew one of these o-rings and it leaked from the side of the dog bone where it mounts to the bottom. since the o-rings are centered the leaking fluid can go in just about any direction but more than likely it will leak from the side where the o-ring is ripped/damaged.

                        There are only 2 hoses. one (I think is high pressure side) goes down to transom...other comes from reverse lock (on shift plate , low pressure side)

                        I do see other "holes...not threaded" that do nothing. I bought the bottom end on ebay for $75 since my motor was good. I received the reservoir and everything below it for this price.

                        It turns out the reason I blew the o-ring is that the reverse lock adjustment moved (sand bar I think) and the reverse lock would not let my drive go up. Down worked fine but up strained the pump and barely moved the drive. I left the up switch on too long and pow o-ring blows out the side of dog bone, it was hard to trace cause it leaked somewhere different every time.
                        Hope this helps,
                        Sean
                        Sean Swihart
                        Swihart Art
                        1977 Starcraft Capri Trihull
                        3.0 Merc 140
                        We call her "Sweetness"

                        Comment



                        • #13
                          Re: rebuild instructions for pre-alpha hydraulic trim pump

                          yep, that's the dog bone...
                          Sean Swihart
                          Swihart Art
                          1977 Starcraft Capri Trihull
                          3.0 Merc 140
                          We call her "Sweetness"

                          Comment



                          • #14
                            Re: rebuild instructions for pre-alpha hydraulic trim pump

                            First off, thanks for the reply, I will be opening this up tonight and was give then schematics earlier today. So if it was just the o-rings, why not replace these instead of buying new bottom? I am checking to see if I missread your post, but was there damage due to the leak or a leak was caused by damage?

                            Any recommendations on where to pick up the o-rings?

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                            • #15
                              Re: rebuild instructions for pre-alpha hydraulic trim pump

                              Plus I am sure I will need a gasket or two.

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