Not looking good...
https://youtu.be/zw-FiwnBwkU?si=DpMdLOeqJa2Y6G8a
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Not looking good...
https://youtu.be/zw-FiwnBwkU?si=DpMdLOeqJa2Y6G8a
Ran without oil to me. The aluminum can grip like no other metal except maybe Titanium. Not sure how you would repair the Head casting but someone might. I will check my Yamaha 4 Stroke rebuilder and see what he says.
Heads out. And to me it looks OK!
https://youtu.be/1VRh7GLSy3g?si=bIJswBlpCYWIFksQ
And Rojo, I see some heads for sale on Ebay, and guess what, their top cam bearing looks same as mine, bad! lol
Attachment 477121
This is a snapshot of one being sold on eBay. I'd say mine looks better, at a bit better. Doh
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Attachment 477122
And here's my bad one above.
The other one of my cam bearing below is gooderer:
Attachment 477124
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Looks like the bearings were turning in their seats. That happens when ran with no oil.
These cam bearings are not separately replacable. The whole head would have to spin! lolQuote:
Originally Posted by Barnacle Bill
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May just be normal wear patterns. I would think that the cam shaft would have galded aluminum stuck to it if it ran without oil.
Camshaft side looks fine, smooth as silk.Quote:
Originally Posted by DockShootinJack
I am wondering if the marks are from start up. At times outboards sit for long periods of time. Sure could have less than optimum lubricant until oil pressure is built up. Engines would probably last a lot longer with an electric oil pump to get oil up into the motor before it was started.