Everyone knows about the sacrificial anodes on the outside of outboard motors, they are obvious and offered in many 100 hour service kits.
But did you know there are anodes inside your motor on the head and block?
My Yamaha 150 has 4 that bolt into the motor , if you have a 250hp you have even more.
On the Yamaha they are fairly easy to get to and replace.
Here is a picture of some with about 500 hours on the engine.
This is the hole it came out of, just below the #2 sparkplug
So anyway, just a heads up, these are overlooked way too often and Will absolutely contribute to catastrophic engine failure.
Easy fix, and it’s way worse in the salt. If I were you I’d replace mine every 200-300 hours. I know stuff, now so do you.
For what it’s worth, there’s a smaller one in the very top of the motor (in the head itself) and that one is always the worst. At least change it, you’ll be glad you did. If you don’t it’s only a matter of time until it corrodes, breaks off, and ends up in the water jacket essentially killing your nice toy. It happens more than you know
That’s all I got.
EF
