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1997 Yamaha 25hp outboard L/U issues c25mshv

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  • 1997 Yamaha 25hp outboard L/U issues c25mshv

    Replaced water pump and went to reinstall but can't get lower unit to shift. I have the foot off the motor and the shift rod will not move up or down. There is no clicking sounds and when I spin the prop either way the drive shaft turns either way. I can't for the life of me find neutral as the shift shaft will not move either way. Please help. I'm at my wits end.

  • #2
    First, go here and find your manual...https://www.vansoutboardparts.com/se...a-shop-manuals

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    • #3
      I have the manual and the know how. I just can't fathom how the shift cam could be stuck. Could it be the dog clutch? Or the spring on the end of the prop shaft? I just can't figure it out. I don't want to pull the shift cam just yet because the reinstall would be very time consuming. Any tricks you can think of to free the shift cam?

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      • #4
        Can you post exactly what is on the engine data plate... Model and Serial number. Trying to figure out which manual is applicable to your engine. Thanks

        Is this you L/U setup? http://www.boats.net/parts/search/Ya...201/parts.html
        Last edited by panasonic; 05-03-2018, 11:27 PM.

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        • #5
          C25MSHV. Yes thats the one

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          • #6
            Shift cam is super stuck. Do you think pulling the prop shaft will free it up?

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            • #7
              Can you get at item #53 and screw #54 down thru the hole?
              I can only think that shift "wedge" at the end of the shaft is pushed down to far and is now wedged itself in place. And how that happened due to a water pump change is beyond me.

              Perhaps a pair of vise grips on the part of the shaft sticking out, twisting back and fort slightly and tapping up on the vise grips will get it to pop up free?

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              • #8
                This thread is a flashback for me. I became a member here some years ago when I had my 25hp and had similar troubles after changing water pump.

                Prior to dropping the LU, what position did you have the throttle in..forward, reverse, neutral? When the engine is running the drive shaft is constantly spinning, no matter the gear. So have you tried moving shift shaft as you spin the drive shaft?
                Jason
                1998 S115TLRW + 1976 Aquasport 170

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                • #9
                  hahahaaha
                  let me write the scene.
                  you undid the barrel nut to disconnect the shift shaft.
                  you left the jam nut on the lower shift shaft.
                  while dropping the lower the jam nut hung on the midsection. that caused the shift shaft to raise and disconnect from the spring loaded shift plunger.
                  means the propshaft has to be removed to place the shift cam back in place.
                  not difficult, I see it once a month or so.
                  my bet is you wont do it twice.

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                  • #10
                    Thanks for the replies. Gonna pull the prop shaft. I'll let you know how it goes.

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                    • #11
                      Originally posted by Jason2tpa View Post
                      This thread is a flashback for me. I became a member here some years ago when I had my 25hp and had similar troubles after changing water pump.

                      Prior to dropping the LU, what position did you have the throttle in..forward, reverse, neutral? When the engine is running the drive shaft is constantly spinning, no matter the gear. So have you tried moving shift shaft as you spin the drive shaft?
                      Yeah I've tried it every which way. Rod has it spot on. I can't think of a single other thing that could cause this. Waiting on my brother to bring me a puller so I can get this prop shaft out. I'll keep ya'll updated so the fix will be visible for future users. I googled for hours looking for an answer to this. Again, thanks for all the help and info ya'll.

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                      • #12
                        Rod not a bad story teller either....just needs to learn how to hit the shift button for a few Capitals in his narratives. lol

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                        • #13
                          yaa I know, I let my grammar get lax. sometimes my spelling suxs too. but ya gotta admit I do have some practicle experience.

                          like the farmers insurance guy, I have seen about all of it.
                          however I am never surprised,amazed sometimes.

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                          • #14
                            Welp that was an easy fix. Prop was stuck on the shaft and in the process of destroying....I mean removing the prop, the shift cam fell back into place. Got the prop off and greased the splines and now she's all back together. Thanks again everyone for the help.

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                            • #15
                              never heard of it fixing itself before, you sure it shifts as it should?

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