Delta water - outboard motor corrosion problems?

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Posted by Dan Blanton on 2013-02-08 12:27:13

Hey Folks,

When I checked the motor oil the other day I was horrified to discover water in the crankcase - the oil looked like a milk shake.

I took it to my boat mechanic: I just found out from Nelson Gong, my boat mechanic that my Yamaha F100 engine is blown – severe scoring of the cylinders. Even if I replaced the block it would cost me 8 grand. He’s going to hang a new Yamaha FF115 on it. By the time it’s done it’ll probably cost me close to 12 grand. The new motor is a tad over 10 grand. We’ll get by with the same controls and prop.

The motor is 14 years old and has 1800 hours on it but most all of that time is on the delta or SL. I’ve only run the ocean a couple of dozen times and I’ve always flushed the engine well. There seems to be some corrosion issue with delta water but I don’t know why. I haven’t heard of others complaining about it. What is your take on the delta water? Have any of you experienced water jacket/cylinder corrosion problems? Yamahas last forever and I feel like I should have gotten more hours out of mine. Any insights or advice? I don’t want to screw up the new motor – it should outlast me if I take care of it properly – which I’ve always done.

A couple of years ago I had a blown exhaust gasket and there was lots of corrosion in the water jackets. This time I think a head gasket went, causing some of the corrosion in the cylinders. There seems to be a lot of corrosion build-up from the delta water. I don’t know what to do about it.



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