Strange Noises

It sounds like your transmission is starting to spin at higher RPMs (in neutral). Does it make the same noise when its in the water, or only on the trailer?

To minimize possibilities, I think take both belts off and run it for a 30 seconds.

May help you get closer to a resolution

Excellent ideas all! I had not ruled out it being associated with the belts. Didn't think to take the belts off. I will definitely give that a test.

These answers are most certainly reassuring. Based on these answers I can just spray everything with WD40 right? Jk, I will fix it properly whatever is the culprit.

Well thankfully Mother Nature took away the possibility of getting my hair caught 5 year ago.

So made it to a launch and did to tests. 1 disengaged the transmission cable and verified it was in neutral. The noise still persisted. Then I stuck the screwdriver to the transmission and didn't not hear that sound.

Then screwdriver to rwp and didn't hear it, alternator didn't hear it, circulating pump was very noticeable from the screwdriver.

Have to move to a different launch up the road to at least run it on the water. That strange noise is gone. Had the boat out for about 10 min and never once heard it. The other "airy" sound is definitely coming from the primary side of the carb. Maybe the throttle plate is just slightly askew?

Unfortunately, my original problem re-emerged and I'm back to share one. I'll post the video link once it is uploaded.

Hey Spiral, just an observation, but that sounds exactly like the noise my prop shaft was making after repacking the stuffing box. I had to re-adjust both nuts a bit before I found the "sweet spot" to make the noise subside. Granted, if in neutral and the shaft isn't rotating, then that's definitely not your issue. Hopefully it's just the belts...

latest vids:

First Start evening test
Video 3

Without any belts. The engine temp started creeping, so that's why this video is extremely short. In the quick moves, i got the rpms to around 2000 and didn't notice the sound. Belt driven device confirmation?
Video 4

This is the longest one with extended use of the throttle. Not only can you hear the original sound of this post, but you can get a sense of the issue that started this nightmare.
Video 5 (longest one)

Easy idle with alternator disconnected. Very obvious original issue i was having. keep an eye on the RWP wheel as well as the bolts for the circ. pump. Not only can you hear the engine, but you can definitely see it too.
Video 6

Another "surging" video, this time with alternator connected again.
Video 7

A director's cut with flyover shots of the carb and then back to the transmission.
Video 8

I did disconnect the transmission cable, and moved it into forward and reverse a few times (very smooth) and settled it in neutral for these vids. I can verify that the prop wasn't spinning as there was no forward movement of the boat at any time unless I specifically put it in gear. I really wished it was as simple as the shaft nuts :(

While the belts were off, I tried to "wiggle" the circ pump wheel and that seemed pretty tight on the shaft. I spun the wheel without the belt and it spun pretty freely (of course not as fast as if the engine was moving it)

In the end, the noise is annoying and means somthing isn't quite right but did go away for my afternoon test. It is really the surging that makes the boat inoperable at this stage. 62wood thought it was the timing, but I checked that many many times tonight and it is spot on at 10º both in neutral and in gear. Checked the points and still holding strong at 0.018.

I guess my plan of attack would be to put the old dizzy parts back in as the boat was running like a top at the start of the season. If that doesn't work, suck it up and get a compression tester to rule out compression. After that, fuel?

Thanks for all your thoughts and suggestions. I'm running out of things to check/change, but obviously the missing piece is not lodged in my thoughts otherwise i would be out getting in some good runs :D

Final post for this thread i hope. We took the boat out to make sure our noise had been cured. Let's just say we are a happy family again :)

Evening Cruise


Thanks again for all the suggestions!

-Spiral

xarmypilot wrote: As a footnote, I still get the annoying noise from time to time - but only when I have the boat running in the driveway. I've learned that if I drop a half cup of water on the gland nut before running, it'll just purr like a tiger. I've checked shaft alignment and it appears to be spot on, so there's probably a rubber gasket or o-ring in there somewhere that is in need of just a little lubrication.

Rob,
I have experienced this as well. Even with the "drippless" packing in the shaft gland, it still needs some water for lubrication. Typically it's a high pitch squeal at lower RPM's that goes away after the boats been in the water a few.