Transmission slip?

[rossrips7]

I've got a 2002 super air and Had the boat out today and ran fine across the lake and throughout a first rider. Then once the second wake boarder when I put the power to it to get on plane it revved high, almost like a prop cavitating. Also around 35 there was a pretty good vibration. Checked the prop it checked out with no dings and bends. Any one else have this problem? I'm praying its not the transmission slipping under load. If you slowly get to speed it gets there fine with no slipping or cavitating or slippage. Anyone had this problem before? Or ideas?


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[rossrips7]

Also, checked the vdrive and trans fluid and they both were full. The vdrive oil wasn't hot. But the trans fluid was pretty darn hot.


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[rossrips7]

Update. Checked the trans fluid when I got home and it was a little down from the full line but not much at all. Would that cause all of my symptoms?


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[t.franscioni]

Something is definitely not right. Sure sounds like your transmission clutches are worn out and slipping... Youll need a clutch kit and a gasket kit and a rebuild manual. Cost will be about $400 (labor will be much more if you take to a shop). Its not a daunting task if you have average mechanical skill you can definitely tackle it your self in a day or two.

[rossrips7]

Thanks for the help! Any chance I could drain the trans refill it with new oil and make sure it's 100 percent full to make the problem quit or are you pretty sure I'll be putting the clutch kit in?


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[rossrips7]

And I see on ski dim that the vdrive and also the trans have clutches. Any idea which one may be my problem?


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[t.franscioni]

I suppose changing the oil in the trans wouldn't hurt to give it a try but if the clutches are worn out then it won't fix anything depending on how bad the oil is changing it may give you some more life but I'm just speculating. The Vdrive does not have clutches what you need is the following parts:

1) Rebuild manual: send me a PM and I can email you the rebuild manual.
2) from skidim order: Gasket Oil Seal Kit (40A & 40i) All. $183. This kit is made for both the 40A and 40i transmissions, you have the 40i and so you will only use about half the O rings that come in the kit, the others are for the 40A model.
3) Clutch Pack Kit ALL PCM Forward & Reverse. $239.

You our can get the gasket and the clutch kit from nautiqueparts.com and there is a promo code for a discount if your a member of this site... Someone will have to chime in with that code but it may be cheaper if you buy from them with the promo code.

here is a picture of all the clutches, gaskets and Orings that you need to change. The bigger stack of clutches is the forward set and the smaller stack the reverse set: there the same clutches and all come in the same kit you just put some in the reverse section and some in the forward section.

[t.franscioni]

You know as a test you could try running your boat hard in reverse. The reverse clutches should not wear out like the forward clutches because they never get used under heavy load. If it's your oil then technically it should slip in reverse also so if it doesn't you know that your forward clutches are definitely the culprit and are worn out.

[rossrips7]

Something I just thought of us could my suck gate I made caused the clutch to burn up? I know that before the 2 times I used it I had zero problems. And when using the suck gate the boat definitely runs higher rpm with much more stress.


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[rossrips7]

Another thing is I wanted to make sure my prop is seated correctly and there's no damage there causing the slip under high loads dealing with the key way? I really just don't want to jump into the transmission if I don't have to!


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[Tryathlete]

You mean surf gate right? Sure it puts more load. Might have burned em
Up.


Sooner or later your toys own you

[rossrips7]

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[rossrips7]

Just wondering why there would be wear marks in the gap? Is the gap suppose to be there?


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[a0128]

You mean surf gate right? Sure it puts more load. Might have burned em up.

Doubtful as you would see issues with any boat with NSS especially the ones where it was added after-the-fact.

[t.franscioni]

Gap looks normal mine looked just like when I pulled my prop off. The wear marks on the driveshaft look like layth marks from when the drive shaft was machined during its manufacturing. The fact that your tranny fluid is super hot means something is messed up with your tranny. Maybe your tranny cooler is clogged and not cooling the oil and when the oil gets too hot it can't do its job correctly and causes your clutch to slip? My concern if it was my boat would be that Iv already damaged the clutch plates and therefore would need to be replaced regardless. Maybe check your tranny cooler for blockage.