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Thread: Squeal sound
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06-06-2022, 08:47 PM #1
Squeal sound
My Max has just over 102 hours. Yesterday while out on the boat I noticed a squeal sound while coming off plane ultimately to idle in forward gear while checking out a cove. Once the boat reached idle speed it began making a squeal or squeak sound. Kind of sounded like a car with a slipping wet belt, except when I checked the bilge it was dry. Next I tried to isolate was it coming from the engine, transmission or vdrive. I used the button on the throttle to rev only the engine while not in gear and there was no squeal sound and all seemed perfect. Then I put the boat in forward gear at idle speed and the squeal started again. I opened the drive access door to try and find the source of the squeal and it's hard to tell if it was the drive making the noise or the transmission. It did not seem to affect the boat performance at all and the sound would go away as soon as I would go just last idle speed or RPM.
Throughout the day I would slow down to idle and try to listen for the sound to see if it was repeating and it didn't for most of the day except for one or two other times. Boat felt fine so I'm hoping this is nothing serious. Planning to take it to the dealer this week and have them look at it. I just had the drive fluids and oil changed at the dealer, so this was my first time using the boat since service. Hoping this is something simple for them to isolate and fix.
Just curious if others may know of some possible sources for this sound. Thanks for any insight or help!2019 Moomba Max "MOOMBAE"
Mods: Wakemakers upgrade + 500 lbs of lead
2016 Yamaha AR192 - sold
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06-06-2022, 08:53 PM #2
Possibly a shaft seal?
Sent from my SM-G781V using Tapatalk2021 Moomba Makai
Black Cherry Metal Flake & Fire Red
Nibral OJ 15.5x15 Altitude/Wake prop w/1.76 trans v-drive
Wet Sounds bow speakers & 10's on the Tower & ported sub
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06-06-2022, 09:07 PM #3
Are there any signs I can look for with a bad shaft seal? Wouldn’t that mean water would be getting in too? Bilge and vdrive area were bone dry and no signs of water spraying around. Idk, I’m still new to these boats coming from jet.
2019 Moomba Max "MOOMBAE"
Mods: Wakemakers upgrade + 500 lbs of lead
2016 Yamaha AR192 - sold
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06-06-2022, 09:29 PM #4
I just commented on your Facebook post saying I still think it could be humidity and a squealing belt. But when my shaft seal started squealing it wasn’t leaking. My squeal started to always stay around idle. I carefully put my hand down there while someone else drove and moved the seal a little bit and I could tell that’s where the sound came from.
Also my serp belt will also squeal from time to time. I just put some belt conditioner on it and it lasts a few months. It’s not from water in the bilge, it’s just the bilge it really humid.2016 Mojo surf edition
1100lbs rear w/ 475lbs piggyback mid/ center 700lbs/ 500lbs IBS/ 600 lbs lead
ACME 2315
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06-06-2022, 09:47 PM #5
Quick test that won't hurt anything.
On the shaft seal take marine grease (thick) and rub a thin coat on the seal itself.
You could use spray silicone also and let it "harden" then run it again. The rubber can dry out on the interior side and squeak. After it burns up and the squeak goes away it will begin to drip. Water acts as the lube now that it is leaking and the squeak goes away.2015 Moomba Mojo Surf Edition
4,000lbs
Manual Flow
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06-06-2022, 10:16 PM #6
Yep to both the seal comments. That's my bet. The belt is also a possibility too. Easy to rub belt dressing on it too while it's running. I have seen people use a big preschooler crayon too. Lightly touch the belt with it. Need to be careful though! If it is squealing, that will stop it or change the pitch quickly.
Sent from my SM-G781V using Tapatalk2021 Moomba Makai
Black Cherry Metal Flake & Fire Red
Nibral OJ 15.5x15 Altitude/Wake prop w/1.76 trans v-drive
Wet Sounds bow speakers & 10's on the Tower & ported sub
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06-07-2022, 05:59 PM #7
Dropping the boat off tomorrow morning. Based off the replies on my FB post it seems this might be a shaft seal issue. A guy posted a video and the sound is very similar to what I heard. They posted the shaft seal SC uses is not the highest quality and they recommended I go with a Glide shaft seal or other higher quality than what the boat came with. I will hopefully know more this week and will let y’all know the updates.
2019 Moomba Max "MOOMBAE"
Mods: Wakemakers upgrade + 500 lbs of lead
2016 Yamaha AR192 - sold
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06-07-2022, 06:01 PM #8
Hope it's good news and an easy fix
Sent from my SM-G781V using Tapatalk2021 Moomba Makai
Black Cherry Metal Flake & Fire Red
Nibral OJ 15.5x15 Altitude/Wake prop w/1.76 trans v-drive
Wet Sounds bow speakers & 10's on the Tower & ported sub
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06-07-2022, 06:36 PM #9Senior Member
- Join Date
- May 2020
- Location
- Nashville
- Posts
- 229
My shaft seal has developed a very slow drip. At the end of a full day of boating maybe 1-2 cups of water is present in bilge. I'd hate to take it in the dealer now and really not sure i could replace myself. The boat still has warranty left. Can I chance it and wait to end of summer or is this something I must fix now?
2018 Moomba MOJO
4100lbs. ENZO's, Center Tank, IBS
780lbs. Lead Wake
Raptor 400
Surf Prop: OJ 945
2019 Ford F150 FX4
5.0L V8
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06-07-2022, 08:54 PM #10
Shaft seal is an easy fix IF you have the puller for the coupler.
Mine was leaking all last season. Between the shaft seal and the rudder O-Ring I would get 5ish gallons after a 7hr day.
Changed the rudder o-ring before Norris since the boat would be in the water for 6 days. Still got some water but never enough for the bilge to function.
Changed the seal 2 weeks ago from the SEF version to the Glide setup. Completely dry now. I can see where the SEF seal was rubbing on the bottom and it became oval and leaked.
1-2 cups is nothing to worry about. You can wait until the end of the season. If you still have warranty, you might want to schedule the fix and keep using until the dealer has time to get it fixed.2015 Moomba Mojo Surf Edition
4,000lbs
Manual Flow