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Dec 30th, 2023
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 Melted Aluminum in Lower Unit?
#7603353
06/03/12 11:16 PM
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Joined: Apr 2010
Posts: 202
bcoop1723
OP
Outdoorsman
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OP
Outdoorsman
Joined: Apr 2010
Posts: 202 |
05 Yamaha Vmax 250
Ran boat yesterday had good power all day, pull it out of the water strapping it down I smell burnt Lower Unit oil. Just bought the boat and to our knowledge it had been fully serviced before the pick-up.
Get home and a decent sized chunk of aluminum comes out the exhaust/prop well. We've pulled about 5 pieces averaging 3-5" in length and about 1.5-2" wide-just enough to squeeze out in the space. Still lots of shavings and smaller chunks. Compression test shows 110 on all 6 cyl.
Any ideas what could be causing this? Thanks for reading and any suggestions.
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Re: Melted Aluminum in Lower Unit?
[Re: bcoop1723]
#7603406
06/03/12 11:38 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Melted Aluminum in Lower Unit?
[Re: bcoop1723]
#7603413
06/03/12 11:42 PM
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Joined: Apr 2010
Posts: 202
bcoop1723
OP
Outdoorsman
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OP
Outdoorsman
Joined: Apr 2010
Posts: 202 |
What the heck is a melted tuner?
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Re: Melted Aluminum in Lower Unit?
[Re: bcoop1723]
#7603436
06/03/12 11:49 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
Common problem on 250 Yamys. Directs the exhaust down for a pre-determined length to help evacuate the exhaust gas`s for better performance. Tuner is in the exhaust adaptor below the power-head. Put your serial # here: http://www.yamaha-motor.com/partviewer/default.aspx?ls=outboard
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Melted Aluminum in Lower Unit?
[Re: bcoop1723]
#7603442
06/03/12 11:52 PM
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Joined: Apr 2010
Posts: 202
bcoop1723
OP
Outdoorsman
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OP
Outdoorsman
Joined: Apr 2010
Posts: 202 |
Awesome, thank you very much for all your help and especially for the website
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Re: Melted Aluminum in Lower Unit?
[Re: bcoop1723]
#7603660
06/04/12 01:06 AM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
Their are motor issues that cause this, you want to have checked.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Melted Aluminum in Lower Unit?
[Re: gary purdy]
#7603809
06/04/12 01:51 AM
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Joined: May 2003
Posts: 17,665
Chris B
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 17,665 |
I am on my third tuner on my 225 HPDI. The replacement requires removing the powerhead to replace. I sure wish i knew what is causing these failures.
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Re: Melted Aluminum in Lower Unit?
[Re: bcoop1723]
#7604128
06/04/12 03:13 AM
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Joined: Dec 2005
Posts: 4,392
ogles824 (aka Lakewaydr50)
TFF Team Angler
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TFF Team Angler
Joined: Dec 2005
Posts: 4,392 |
What the heck is a melted tuner? Oh I couldn't resist........ a Tuner Melt;]
2012 ZX200 Skeeter 2012 Yamaha 200 SHO Isaiah 40:31 "but those who hope in the Lord will renew their strength. They will soar on wings like eagles, they will run and not grow weary, they will walk and not be faint. Proud student of the Pro Staffer. https://www.youtube.com/watch?v=TzwF72B2F2w&t=14s
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Re: Melted Aluminum in Lower Unit?
[Re: gary purdy]
#7604188
06/04/12 03:34 AM
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Joined: Dec 2005
Posts: 4,392
ogles824 (aka Lakewaydr50)
TFF Team Angler
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TFF Team Angler
Joined: Dec 2005
Posts: 4,392 |
Their are motor issues that cause this, you want to have checked. Ok all kidding aside, I have messed with racing engines on and off for most of my life and I have seen this before. This is caused by a lean condition. Any time an exhaust system on an engine gets this hot the engine is not getting enough fuel. Odds are the tops of the pistons are being exposed to the same amount of heat. I'd definately have it checked out by a reputable mechanic before something happens inside the powerhead your wallet won't like.....
2012 ZX200 Skeeter 2012 Yamaha 200 SHO Isaiah 40:31 "but those who hope in the Lord will renew their strength. They will soar on wings like eagles, they will run and not grow weary, they will walk and not be faint. Proud student of the Pro Staffer. https://www.youtube.com/watch?v=TzwF72B2F2w&t=14s
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Re: Melted Aluminum in Lower Unit?
[Re: bcoop1723]
#7604685
06/04/12 01:05 PM
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Joined: Aug 2003
Posts: 3,600
East Bay Guide Jeff Brandon
TFF Team Angler
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TFF Team Angler
Joined: Aug 2003
Posts: 3,600 |
From what I have seen this normally occurs after the yamaha has been run in real shallow water, ie: sand, etc and it gets in the cooling system. It then gathers in the poppit valve and all of a sudden your water pressure drops and next thing you know your temps start rising at idle. I have burned one up and there is a noticeable difference in hole shot once it happens. The only way I have been able to keep this from happening again is by running the interface cable from the engine to a lowrance depth finder and it then I can constantly monitor engine temps, etc. I have had temps rise twice since and now when they do I clean the poppit and all is fine, although still an irritant.
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Re: Melted Aluminum in Lower Unit?
[Re: East Bay Guide Jeff Brandon]
#7606846
06/04/12 10:19 PM
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Joined: May 2003
Posts: 17,665
Chris B
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 17,665 |
How much does one of those engine cables cost and how hard is it to hook up? Nobody tells you when you buy one of these engines how many fuel filters they have and how often they need to be changed. I have tried to stay on top of it now but probably didn't change them enough at first.
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Re: Melted Aluminum in Lower Unit?
[Re: Chris B]
#7606916
06/04/12 10:32 PM
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Joined: Aug 2003
Posts: 3,600
East Bay Guide Jeff Brandon
TFF Team Angler
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TFF Team Angler
Joined: Aug 2003
Posts: 3,600 |
How much does one of those engine cables cost and how hard is it to hook up? Nobody tells you when you buy one of these engines how many fuel filters they have and how often they need to be changed. I have tried to stay on top of it now but probably didn't change them enough at first. Was thinking I paid about 60 bucks for mine, but that has been about 5 years ago, so probably a little more now. you just plug it in on the starboard side of the engine and run the cable up to your depth finder or LMS 400 with a T and you are good to go. If you have the red connector units this should be the right part #. Lowrance Yamaha Engine Interface Cable -EB-5025194
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Re: Melted Aluminum in Lower Unit?
[Re: East Bay Guide Jeff Brandon]
#7608012
06/05/12 02:08 AM
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Joined: Dec 2005
Posts: 4,392
ogles824 (aka Lakewaydr50)
TFF Team Angler
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TFF Team Angler
Joined: Dec 2005
Posts: 4,392 |
From what I have seen this normally occurs after the yamaha has been run in real shallow water, ie: sand, etc and it gets in the cooling system. It then gathers in the poppit valve and all of a sudden your water pressure drops and next thing you know your temps start rising at idle. I have burned one up and there is a noticeable difference in hole shot once it happens. The only way I have been able to keep this from happening again is by running the interface cable from the engine to a lowrance depth finder and it then I can constantly monitor engine temps, etc. I have had temps rise twice since and now when they do I clean the poppit and all is fine, although still an irritant. This too. If that poppet is not controlling water flow properly, you can get an air pocket in the top of the water column in the engine and the top two pistons get cooked. Had something similar happen to me on an old OMC motor years ago. Caught it before any major damage was done.......
2012 ZX200 Skeeter 2012 Yamaha 200 SHO Isaiah 40:31 "but those who hope in the Lord will renew their strength. They will soar on wings like eagles, they will run and not grow weary, they will walk and not be faint. Proud student of the Pro Staffer. https://www.youtube.com/watch?v=TzwF72B2F2w&t=14s
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