1979 Ski Nautique Propeller not disengaging |
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stevedsr
Newbie Joined: May-09-2015 Location: Orlando, Fl Status: Offline Points: 10 |
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Posted: February-28-2018 at 10:08pm |
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I bought a 1979 Ski Nautique about 3 years ago. I've since rebuilt the engine 351 Commander) and transmission and have been enjoying it. However, this week out of nowhere, while putting it in the lake, I noticed the propeller didn't disengage and I had enough forward motion in idle to jam the bow against the trailer. I killed the engine and pushed out into the lake and started up again. I was able to start the engine with no problem. I was able to go forward but when I put the boat in reverse, I kept going forward until it stalled. I'm hoping it's not the bushing at the propeller shaft. Let me know your thoughts.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Steve,
What you have is called a "dirty" neutral. It's caused by warped clutch plates. The warping is common when a trans is overheated. Typically a new clutch pack will take care of the problem. You said you rebuilt the trans. What did you do with it? |
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stevedsr
Newbie Joined: May-09-2015 Location: Orlando, Fl Status: Offline Points: 10 |
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thank you. I actually had a guy rebuild it for me. I don't know what he did with the parts. The fluid was red and full. I was running it the week before at the put in, maybe it overheated then. Now I have to research the clutch plates and how to fix them...hopefully it won't be another couple of boat bucks (1 boat buck = $1000).
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5697 |
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You should first disconnect your shift cable from the transmission and ensure it is working correctly when you are in forward will it firmly lock in forward, when you are in neutral is it firmly in neutral, etc... if all that is working correctly then yes you may need to open up that transmission.
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10753 |
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I think, like Joe said make sure it's not a linkage issue first.
If the boat was running fine the week before with no slippage issues, no engine overheat issues, I doubt that you overheated your clutch plates sitting on the trailer. What do you mean by "when I put the boat in reverse, I kept going forward until it stalled."? With the engine running, when you put it in reverse, does the shaft turn backwards? In any case, your strut bushing that you asked about isn't the problem. You may end up inside the transmission again, but check the other stuff first. |
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stevedsr
Newbie Joined: May-09-2015 Location: Orlando, Fl Status: Offline Points: 10 |
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thanks. when I started the engine the prop shaft was spinning in the forward direction even with the propeller disengaged. When I put it in reverse the throttle cable seemingly pushed the transmission in reverse (pushed the gear shift backwards) but the prop kept spinning in the forward direction. When I was on the open water testing it I could put the throttle in reverse, but the boat kept moving at speed (it would actually speed up the farther back I pushed the throttle). If I moved the throttle too far back the engine stalled.
So, in summary..The boat went forward under power with the prop disengaged and in neutral. It would speed up in forward if I throttled forward and would speed up in forward if I throttled in reverse, up to a point it then it would stall. I'm hoping it's not an expensive fix, but I think I know better at this point. |
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stevedsr
Newbie Joined: May-09-2015 Location: Orlando, Fl Status: Offline Points: 10 |
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I moved the throttle forward and reverse and it moved the gear arm forward and backward. Is there something more I should do?
I'm starting to wrap my head around the fact that this is not going to be easy. |
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GottaSki
Grand Poobah Joined: April-21-2005 Location: NE CT Status: Offline Points: 3337 |
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A mechanical (clutch pack related) dirty neutral will persist with the engine off.
See if you can spin the shaft. If requires high effort, clutch plates are warped, or forward piston stuck, A hydraulic dirty neutral (forward circuit pressurized past spool valve in neutral and reverse) would not persist with the engine off when line pressure is zero. |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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MourningWood
Gold Member Joined: June-13-2014 Location: NorCal Status: Offline Points: 891 |
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as has been suggested, disconnect the shift cable from the transmission shift lever.
Supply water, start boat and watch prop. (be sure and spray lube the strut bearing). See if manually moving the trans. shift lever affects things. (you won't need to move throttle to do this) |
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1994 Ski Nautique "Riot"
1964 Dunphy X-55 "One 'N Dun" 'I measured twice, cut three times, and it's still too short!" |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10753 |
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Based on your description here, you're gonna be getting into the internals of the transmission again since no matter what you do it's stuck in Forward. If you lay under the boat on the trailer with the engine off can you rotate the prop shaft or does it not turn at all? How long ago was the rebuild? |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Your 79 should have a Velvet Drive. Correct?
Yes, how long ago and:
Also, do you remember where you placed the big clutch spring snap ring that's between the clutch pack and clutch forward piston? It's really a spacer and not a snap ring. |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10753 |
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This was in his answer to your first post Pete
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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ken, Thanks. Yup, I missed it! Steve, The week you had the boat running before the trans problem, did you ever have any engine cooling problems? |
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stevedsr
Newbie Joined: May-09-2015 Location: Orlando, Fl Status: Offline Points: 10 |
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I can't turn the prop with the engine off. Looks like I have to figure out how to repair this too.
What a love/hate relationship this is... |
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stevedsr
Newbie Joined: May-09-2015 Location: Orlando, Fl Status: Offline Points: 10 |
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I really don't know, my temp gauge is out, I've been checking my transmission fluid and it was still red in color. I did put on a new intake hose that is is much easier to get to to clean the intake filter. The temperature gauge is being replaced during this repair.
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10753 |
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Well your transmission is mechanically bound up in forward if you can't turn the prop by hand with the engine off because you're trying to turn the engine too, so you only have one problem. A jammed up transmission. I guess that's a little bad news and a little good news |
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3610 |
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He might remove the 4 bolts holding the prop shaft to the transmission and see if the tranny will turn when it is not connected to the shaft.. Just to rule out a bind in the prop shaft alignment. The tranny will be coming out either way for repair so it is not wasting time.
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shierh
Gold Member Joined: April-29-2015 Location: Florida Status: Offline Points: 605 |
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these are such simple transmissions. I ve never messed with one before until I did mine a couple of years ago. its pretty strait forward. rebuild kit with all new clutch plates. If bearings are good then its pretty simple.. Got min right first try.
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stevedsr
Newbie Joined: May-09-2015 Location: Orlando, Fl Status: Offline Points: 10 |
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Engine rebuild about 2.5 years ago. Transmission 14 months
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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In the 14 months, did the trans ever run normal? |
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10753 |
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Here Pete, from post one in the thread, this should answer your question |
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stevedsr
Newbie Joined: May-09-2015 Location: Orlando, Fl Status: Offline Points: 10 |
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I think so...good response while driving. don't know if it was running hot or not...I have a sneaking suspicion that the guy didn't do a great job.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Steve, If it ran for the 14 months and then locked up, we're back to a possible overheat. It may not be a poor rebuild job? The trans has got to be opened up to determine the problem. |
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stevedsr
Newbie Joined: May-09-2015 Location: Orlando, Fl Status: Offline Points: 10 |
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Gotcha. I'm going to work on it as soon as I can.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Steve, Did you just lengthen a hose? You didn't reroute a hose?? Just asking trying to get an idea of a possible overheat. Also, you mentioned you couldn't turn the prop by hand. Yes, it could be a trans problem but also a prop shaft alignment problem. How's the alignment? |
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