Tweet
Hey people I just picked up a 86 ski nautique and got it running after it sat for 7 years, my problem is this, while running I have manually moved the arm on the trans forward and reverse and the shaft doesn't do anything. What's weird to me is that while running in neutral I can hold the shaft from spinning but if I let it go it quickly begins to spin fairly fast Even in gear it does the same. And there is so little resistance behind it even when let go I can stop it from spinng easily. I was told by the previous owners son that he thought the damper plate was junk but I'm not sure if these symptoms are all from that?
-
-
I personally don't think your damper plate is the issue. It might be junk, but it wouldn't be the cause of what your describing. The damper plate has two main parts to it:
-The outer plate
-The inner plate
The outer plate it bolted rigidly to the flywheel with 6 bolts. The inner plate is has a female spline that accepts the transmission input shaft. The inner and outer plates are connected together with high tension springs. This allow's vibrations to be absorbed. Typically the springs get loose or break, causing the a "rocks in a can noise." They will usually continue to transmit torque from the engine to transmission as the springs get weak or break. Unless they all the spring broke. If this happened I would assume it would be accompanied by alot of noise.
Are you hearing nasty noises when you shift into forward or reverse?
I think your transmission needs to looked at by an someone who knows velvet drives. -
No I'm not hearing any noises changing from forward to reverse...Comment
-
sounds like you have no transmission oil(ATF fluid). On land in neutral, whether you have fluid or not, the engine will spin fast enough to convert some of its energy thru the direct drive gears and pressure plates to turn the prop shaft. In water most of this disappears and the shaft will not spin, and if it does it will be very slowly.. The packing gland on the prop shaft will be quite loose allowing yours to spin very freely.
In forward, neutral or reverse, the symptoms will be the same with no fluid, as there is nothing to pump up the hydraulic pressure plates inside the transmission.
Hopefully adding fluid will be a nice easy fix assuming it hasnt been run without fluid for too long.
If you add fluid and water test , check on trailer in water first to make sure the pressure plates have got full pressure. whilst connected to the trailer, put in forward and reverse and the boat should want to drive.
If it doesn't, then you have possibly bigger isssues, which can be eliminated by, is the problem in forward or reverse or both, and posting here for more answers.
Whilst not a mechanic i have completely re-built 2 of these transmissions in my garage, so i have some idea as to how they work.
other issues if problem still persists could possibly be the velvet drive oil pump, or seals not sealing properly on the hydraulic pressure plates or pressure plates completely worn out(even worn, you shouldn't be able to stop shaft with your hand). these will require dissasembly to repair
as above there is almost no chance it is the damper plate
hope you have some better luckComment
-
Thanks for the input dude. I will have to do some more diagnosing and ill post up what I learn. Thanks againComment
-
So I figured I'd share what I found when I pulled the trany out and apart... A broken pump drive gear everything else looked fine so il jump on ordering the parts!Comment
-
nice easy fix, new oil pump and your good to go. Any sign of why the pump broke the gear?? no excessive heat marks or anything???Comment
Comment