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Posts: 1144
Location: Minnesota. | I have a 2012 Yamaha 150 4 stroke that has developed some crummy pitting on the skeg area of the lower unit.
Took her to a dealer last year and they tightened a nut on the engine and said it would be good. That made sense since they said it was not tight. Not so great a fix after spending a few weeks on the family vacation.
Any help will be appreciated a lot. Thank you,
Jeremy. |
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Posts: 3483
Location: Elk River, Minnesota | Hiya,
Can you take a picture and post it? Can you also include a picture of the lower unit an transom together?
Steve
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Posts: 1144
Location: Minnesota. | VMS - 7/26/2017 8:27 AM
Hiya,
Can you take a picture and post it? Can you also include a picture of the lower unit an transom together?
Steve
Steve, thank you for any help and effort here. If you'd need more/better pics please let me know.
Edited by Jeremy 7/26/2017 12:47 PM
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P7260534.JPG (172KB - 447 downloads)
P7260533.JPG (113KB - 424 downloads)
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Posts: 443
Location: Duluth, MN | Odd.....looks like it got run across a sandbar. |
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Posts: 1144
Location: Minnesota. | Lundbob - 7/26/2017 1:10 PM
Odd.....looks like it got run across a sandbar.
That was last year,last run! New prop for this spring and the skeg was clean of any corrosion. This happened over 3wks of vacation on Vermilion. |
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Posts: 16632
Location: The desert | Anode problem maybe? |
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Posts: 3483
Location: Elk River, Minnesota | Hiya,
Thats what I was thinking as well. The odd part is the sacrificial anode at the bottom of the lower unit mounting is there and working as it is showing pitting itself.
I wonder if when the lower unit went through the sand that some of the aluminum was exposed, and somehow there is a low electrical charge running through the system while charging?
I have this on my rig when I am charging my boat, I have felt a very low level charge when my forearms hit the gunnel where the paint has chipped off... I have not been able to isolate the issue yet...
Steve |
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Posts: 1144
Location: Minnesota. | Thanks Steve. I think I'll take her in at some point after doing some re-checking myself. This stuff makes me nervy...
Thank you.
Jeremy. |
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Posts: 16632
Location: The desert | Jeremy - 7/26/2017 4:27 PM
Thanks Steve. I think I'll take her in at some point after doing some re-checking myself. This stuff makes me nervy...
Thank you.
Jeremy.
I bet you could have the lower unit repainted, for extra protection maybe add another anode down on the lower unit somewhere. |
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Posts: 1144
Location: Minnesota. | Pointerpride102 - 7/26/2017 6:43 PM
Jeremy - 7/26/2017 4:27 PM
Thanks Steve. I think I'll take her in at some point after doing some re-checking myself. This stuff makes me nervy...
Thank you.
Jeremy.
I bet you could have the lower unit repainted, for extra protection maybe add another anode down on the lower unit somewhere.
Thanks Mike, I'll look into it. This just isn't right. You see lots of scuffed up lower units tho and they aren't pitted like this. |
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Posts: 16632
Location: The desert | Jeremy - 7/26/2017 7:22 PM
Pointerpride102 - 7/26/2017 6:43 PM
Jeremy - 7/26/2017 4:27 PM
Thanks Steve. I think I'll take her in at some point after doing some re-checking myself. This stuff makes me nervy...
Thank you.
Jeremy.
I bet you could have the lower unit repainted, for extra protection maybe add another anode down on the lower unit somewhere.
Thanks Mike, I'll look into it. This just isn't right. You see lots of scuffed up lower units tho and they aren't pitted like this.
Try some googling on pitting/corrosion on lower unit of outboard. Quite a bit of stuff out there on the salt water side.
On your vacation are you charging on the dock?
Motor all the way in the water or out?
You'll read that these scenarios can lead to potential corrosion. |
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Posts: 1144
Location: Minnesota. | Mike I've been doing the same thing for over 20 yrs at the same dock and 3 diff. motors with nary any issues before.
I hope a dealer will be able to help. It shouldn't be an issue as it's never been before.
Thanks for your suggestions. |
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Posts: 32892
Location: Rhinelander, Wisconsin | I see the pitting looks like it is mostly on the bottom of the lower unit. Check out the bottom of the boat as well, and see if there's any pitting there. |
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Posts: 3483
Location: Elk River, Minnesota | Just another random thought...
Did you by chance have the motor stored outside for the winter?
Reason I ask is if the lower unit was somehow out in the elements, it may just be a bit of corrosion from that... similar to what happens to aluminum wheels when the clear coat gets scratched. It looks more like that to me than anything...
I'd agree with Steve in looking at the bottom of the boat as well... |
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Posts: 1144
Location: Minnesota. | Nope, the boat is stored inside all winter at the local fairgrounds. I'll check the rig out again today and see if anything else shows up.
Thank you. |
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Posts: 32892
Location: Rhinelander, Wisconsin | Reason I asked is that looks like most of the lower units in the Dakotas run on the gravel roads, the rule rather than the exception. If the front of your axle looks like that, you have it pinned down. If not, back to the drawing board I guess. |
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