Faint chatter sound coming from shaft or vdrive assembly

[Erik]

At 'one click' forward headway speed, we've been noticing a very faint chatter sound coming from the rear of the boa, and we also notice the sound when the boat is in reverse. Today while underway, I removed the center seat pad and tried to investigate the issue a bit more. I could not really locate the problem, but it sounded like it was coming from an area rear of the v-drive. Not actually in the v-drive itself.

Is this something that anyone else has ever noticed, and if so, what was it? Should I be concerned? I am wondering also if the boat's idle speed may be a smidge too low. If anyone knows what the idle rpm should be, that would also be appreciated. I know where to change the idle on a Ski Nautique 2001, but I don't know how to change it on the GT40.

Thanks,
Erik

[boatech]

RE: Faint chatter sound coming from shaft or vdrive assembly

gt-40 fuel injected and idle should not be messed with if idle is down you could have a bad idle motor or a dirty idle motor. how many hrs u got on it? have you ever cleaned the throttle body? again DO NOT MOVE the base idle screw. a bad tps sensor can also cause a low idle but i have found that the idle motors and dirty throtttle bodies cause most idle issues.

[richard]

Faint chatter sound from vdrive

most likely the noise is come from the vdrive,I had this inssue before and no more noise after rebuild the vdrive, can't find any damage parts inside, I change all the bearing and the universal joint. walter company supply the kits for rebuild, but it's hard job. if only noise not so loud, let it.

[Erik]

RE: Faint chatter sound from vdrive

I find it extremely unlikey that my v-drive, with under 100 hours on it, needs to be rebuilt. And as I said it really did not sound like the noize was coming from the vdrive. The noize sounded like it was coming from behind the vdrive assembly. I found a few posts on here about a damper plate and some confirmation that the idle speed is related to my issue.

[richard]

RE: Faint chatter sound from vdrive

Erik:
Vdrive noise would heard only when propeller turning,my Vdrive rebuild for the noise on700hr.

[goodfoot00]

RE: Faint chatter sound from vdrive

I once had a swimdeck that was chattering on occasion, replaced the cotter pins and it went away. It's a longshot but an easy check.