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VP 5.7GS PEFS SX Slow speed for RPMs

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  • VP 5.7GS PEFS SX Slow speed for RPMs

    First post after lurking here for years. Used to have classic fiberglass boats with Mercury 1000 outboards. Thought I'd "upgrade" to a newer boat and have less problems... So i'm more accustomed to working on outboards that I/O so please bear with me.

    Last weekend I had to work on the control box because the handle was coming lose. This is a 2000 Chris Craft 232 with the above mentioned VP gear (chevy block, btw). But they decided to use an OMC control box instead of a VP. I worked through that problem with some posts on this forum. When I went to start the boat before taking it to the lake yesterday it wouldn't start, I had the handle installed a few notches off and the neutral safety switch wasn't engaged. Fixed that and went to the lake.

    We ran up and down the lake about 20 miles with no problems all day. On the way back to the dock we did some donuts, nothing too wild, probably 30ft diameter. After the last one I stopped to talk to the family (engine still running) and when we went under way it was fine until I hit about 5mph. The engine will rev to 4000 RPM but the boat would shake and only go to about 10 MPH, I can usually top out at around 40 MPH at 4000 RPM.

    We idled back to the ramp and I thought I'd find a busted prop or something wrapped around the prop but it looked fine.

    I have not gone out to work on the boat yet but am wondering if anyone has any ideas. Is it possible for the outdrive to not quite completely shift into gear, since I was messing with the controls? Where should I start?

    Thanks!

    Dan

  • #2
    May not be fully engaging, but then there would probably would have more grinding

    Either that or engine coupler, drive or pro hub
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"

    Comment


    • #3
      Thanks for the quick response! I wasn't sure if the boat would move at all without fully engaging. There was noise that I wasn't used to. I'll look at adjusting the linkage and check the prop hub. The other items might be above my current pay grade.

      Comment


      • #4
        Check the oil level in the drive, it has a plug in the top which is a dipstick

        Click image for larger version

Name:	SX dipstick.jpg
Views:	1
Size:	84.4 KB
ID:	10909520
        94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
        95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
        07 Seadoo GTX
        Merc Adults Only VP Adults Only
        G-Dad always said "First Liar doesn't stand a chance"

        Comment


        • #5
          I drained and refilled the oil at the beginning of the season but I'll check it. I haven't checked it once a month like the manual says.

          I did check the prop hub by removing the prop and it appears to be fine.

          When I had the shifter in reverse the prop moved freely in one direction and stopped turning sharply if turned in the other direction. When in forward the opposite direction moved freely, as expected. But, when turning the prop by hand instead of a solid stop there was slight tension for a very short time then it stopped. Hard to describe and don't know if it's relevant.

          Comment


          • #6
            If you smelled burnt rubber when this happened then it would be the coupler
            94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
            95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
            07 Seadoo GTX
            Merc Adults Only VP Adults Only
            G-Dad always said "First Liar doesn't stand a chance"

            Comment


            • #7
              I don't remember smelling burnt rubber at the time, but when I removed the prop hub I thought it smelled burnt. Could have picked up the smell? I'm going out to check the oil now but don't have a lot of time to work on it today.

              I've removed the lower unit from an outboard before, but never from an I/O. Maybe I'll be getting some experience removing the entire out drive.

              Comment


              • #8
                Removing the drive is not hard, its just a bit heavy

                You wouldn't smell burnt rubber from the prop hub being under water, but would smell it if it was the engine coupler
                94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                07 Seadoo GTX
                Merc Adults Only VP Adults Only
                G-Dad always said "First Liar doesn't stand a chance"

                Comment


                • #9
                  The oil level was good.

                  I disconnected the linkage and shifted by hand. Here are pictures of the shifter travel with and without the linkage attached. I think they look the same.

                  Is there any way of checking the coupler without removing the entire I/O?

                  Thanks again for your help!

                  Comment


                  • #10
                    I'll have to read over some the "adults only" posts again. Removing things isn't usually my problem it is getting them back on that worries me. I don't have all the specialty tools for alignment and what not.

                    Comment


                    • #11
                      Run it on a hose and see if it shifts in/out ok.

                      If its ok on a hose, mark the prop and prop shaft location. Put back in the water and see if it runs. Pull it back out and check prop location to see if it moved. If it moved its the hub, if it didn't is the coupler
                      94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                      95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                      07 Seadoo GTX
                      Merc Adults Only VP Adults Only
                      G-Dad always said "First Liar doesn't stand a chance"

                      Comment


                      • #12
                        My money is on the coupler. The hub is one of those rigid plastic ones that shatters when it breaks. It's not shattered but I suppose the brass ring in it could spin. I have other props and hubs so I can take those along to try too.

                        Comment


                        • #13
                          Originally posted by dlatshaw View Post
                          I

                          When I had the shifter in reverse the prop moved freely in one direction and stopped turning sharply if turned in the other direction. When in forward the opposite direction moved freely, as expected. But, when turning the prop by hand instead of a solid stop there was slight tension for a very short time then it stopped. Hard to describe and don't know if it's relevant.
                          This sure sounds like a glazed cone clutch to me.

                          If you didn’t use genuine Volvo Penta gear lube last time. You might be able to save it.

                          Drain in all the lube, let it drain for 8 or more hours. Refill with Volvo lube. Launch the boat and drive around in reverse for 10-15 minutes. Change the lube one more time, letting it drain overnight.

                          I’ve gotten a few more years out of lightly glazed cone clutches that customers had used cheap lube in. Works about 30% of the time.
                          Good Luck Muc

                          Comment


                          • #14
                            I used mobile one full synthetic. I've had the boat three years and that's what I've used each year when I drained an refilled it. It's worth a shot, fairly easy to do. I thought though that mobile one was one of the options you can use? Not questioning your knowledge, just asking if anything other than Volvo Penta lube is ok.

                            Comment


                            • #15
                              Sign up today
                              The boat will move at idle just not much higher, for me that's not the clutch, but no VP expert
                              Sounds more like prop or coupler
                              94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                              95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                              07 Seadoo GTX
                              Merc Adults Only VP Adults Only
                              G-Dad always said "First Liar doesn't stand a chance"

                              Comment

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