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what's this transmission clunk / noise? (video)
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DockDoc View Drop Down
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    Posted: October-01-2020 at 9:09pm
('93 sport, 351 PCM, 1:1 trans)

No issues with the boat all summer. I changed the transmission fluid about a month ago (maybe 10 hours ago) just for PM. Used Dex/Merc. The only issue at the time was I think I overfilled it, although not sure how. Sucked out over 2 quarts, and replaced with 2 quarts, and then the next couple times out I found a little bit in the bilge, and since then nothing. I check the dipstick religiously and best I can tell it looks OK (definitely not low). 

NO issues until recently. Boat sat a couple weeks while I was installing the tower. On the next run out, heard this sound when it was cold. Sounds like a clunk, can feel it slightly in the driver's seat. Feels a bit like driving over a very light chop slapping the hull. 

The first time I heard it I figured something was wrong, went back to the dock, poked around and checked trans fluid, didn't find anything off. So we went back out and it was gone. Boat ran normally. 

Just went out again tonight and it was clearly there again. I got in close while under way and it seems to clearly come from the transmission. And when coming out of gear it stops immediately, resumes back in gear. Once again after about 3 minutes it went away completely and the boat ran perfectly fine, including doing some wakeboarding. 

Are the nautique gods just mad at me for putting a tower on? Am I looking at a transmission rebuild? I was thinking I should do another trans fluid flush and see what that does.

Video / audio: 
1993 Sport Nautique
PCM 351w, no ProTec
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8122pbrainard View Drop Down
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Points: 41045 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: October-02-2020 at 5:12am
The first thing that comes to my mind is the damper plate failing. 


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77 Tique

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Additionally, If that engine is not protec but has std distributor, this is the time of year one can get crossfiring from moisture under the cap, it makes a good clang through the driveline
"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."

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DockDoc View Drop Down
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Originally posted by GottaSki GottaSki wrote:

Additionally, If that engine is not protec but has std distributor, this is the time of year one can get crossfiring from moisture under the cap, it makes a good clang through the driveline


That’s interesting- yes, standard distributor. Would that go away after warming up a bit? We have had big temperature / humidity shifts.
1993 Sport Nautique
PCM 351w, no ProTec
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Yes, or get worse before going away, it's highly varisble. It doesn't take much,
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First thing that comes to my mind is, I need to get my ears checked after listening to that video Wink

Second thing is......how about more info, does this only happen at idle or can you be going let's say 20 mph and feel/hear it?

Third thing that comes to my mind is, what's your idle speed when it's cold and making the noise. Both speed in neutral and speed in gear.

Fourth thing.......nevermind, I can only handle 3 things right now.
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Originally posted by KENO KENO wrote:

First thing that comes to my mind is, I need to get my ears checked after listening to that video Wink

Second thing is......how about more info, does this only happen at idle or can you be going let's say 20 mph and feel/hear it?

Third thing that comes to my mind is, what's your idle speed when it's cold and making the noise. Both speed in neutral and speed in gear.

Fourth thing.......nevermind, I can only handle 3 things right now.

Yeah I'll admit it's not super easy to hear on that video, and it was resolving by the second so it easier to hear at the beginning than the end. 

Answers...

- only happens in gear at idle, goes away as engine / boat speed picks up pretty quickly (really anything much higher than idle); does not happen in neutral / with revving engine
- engine speed (i'm going by the tach on the dash here which I don't feel is terribly accurate) - about 680-700 in neutral, maybe 620-650 in gear at idle (no adjustments made prior to this noise starting)
1993 Sport Nautique
PCM 351w, no ProTec
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Originally posted by DockDoc DockDoc wrote:

... about 680-700 in neutral, maybe 620-650 in gear at idle (no adjustments made prior to this noise starting)

I'd say the RPM is low and what you are hearing is the planetary gear set rattle. 


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Originally posted by 8122pbrainard 8122pbrainard wrote:


Originally posted by DockDoc DockDoc wrote:

... about 680-700 in neutral, maybe 620-650 in gear at idle (no adjustments made prior to this noise starting)

I'd say the RPM is low and what you are hearing is the planetary gear set rattle. 


Have my doubts about that. The idles pretty well and it hasn’t changed all summer. And once the trans is warm the sound is gone completely at the same idle speed. Sound isn’t a rattle either, more of a heavy WOOSH WOOSH sound coming right from the transmission.
1993 Sport Nautique
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Those speeds sound reasonable especially considering there was no change from before the fluid change.

No change probably should get that cross firing theory out of your head too.

Maybe, just to keep Pete happy, try cranking it up a little (about 50 rpm or so) and see what happens

Just call it troubleshooting, you can set it back to where you had it pretty easily..

You can also watch the training video in the link below, if you can absorb everything he says, you'll never ever have another question about transmissions...........ever Wink 
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DockDoc View Drop Down
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Originally posted by KENO KENO wrote:

Those speeds sound reasonable especially considering there was no change from before the fluid change.

No change probably should get that cross firing theory out of your head too.

Maybe, just to keep Pete happy, try cranking it up a little (about 50 rpm or so) and see what happens

Just call it troubleshooting, you can set it back to where you had it pretty easily..

You can also watch the training video in the link below, if you can absorb everything he says, you'll never ever have another question about transmissions...........ever Wink 


Based on that video I'm pretty sure it's my girdle spring, which is probably stuck on the turbo encapulator's logarithmic casing. Just a hunch. Lol. 

I didn't mention it before but I actually did add some idle speed and it made no difference. 
1993 Sport Nautique
PCM 351w, no ProTec
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Wow where did you find the video of Pete’s twin brother?  I can only imagine the table talk at Thanksgiving. Big smile
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https://youtu.be/PlGJw-fbd8I
"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."

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Try unhooking the prop shaft from the transmission and see if the noise goes away
You break it I’ll fix it
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