Reply With QuoteI doubt it, there might be something going on, but it's not the prop.
I think my stainless propeller may have caused catastrophic corrosion in the power head of my 90 Etec after 400 hours.
Can anyone confirm this???
It cost me $16,000 to replace the whole motor.
I doubt it, there might be something going on, but it's not the prop.
I have some aluminium in a jar of salt water with some stainless bolts and it is fizzing.Originally Posted by Noelm
The corrosion could only occur when the motor was actually running in salt water as is was always hot flushed with fresh water and stored dry.
Hot sea water in the power head plus Stainless is the only reason I can see.
The batteries were always isolated when stored so no stray currents.
It is a fibreglass hull.
There's millions of boats with stainless props, you have "something" happening, no doubt, how old is the motor (not hours)
Many offshore or bass boats using a etec run a stainless prop
same as nearly every other brand
could be anything at play with your outboard and you don’t say how old it is
Poor servicing and not replacing annodes
incorrect wiring faulty wiring
moored boat
there's stainless bolts holding the thing to you hull as well and they havnt dissolved off I bet
I’m not a etec fan but I bet the prop had nothing to do with it
Let's go right to the beginning, is the motor corroded from the inside out? is the paint bubbled on the outside? are all the bolts and bits and pieces rusted away too? is the corrosion limited to a certain part of the motor? do the anodes get replaced regularly? is the boat used in salt water only?
There are probably a hundred stainless parts on a motor and the prop is the cause? The prop has a rubber bush that would insulate anyway.
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and its greased on top of that
!3 years old. Looked immaculate until engine mounts failed.
Yearly leg oil change turned to $16,000 new engine.
The corrosion must have occurred when motor was running.
The connection was the hot seawater in the power head.
The boat is used in salt water only.
The corrosion was only in the power head. The outside of the motor was immaculate.
The magnesium anodes were lightly corroded.
The Power head acted as an anode for the stainless propeller.
Look at the chemistry of galvanic corrosion.
My new motor has an Aluminium Propeller.
.
T
I don't doubt for one minute you didn't have corrosion in a 13 year old salt water motor, but, I don't think/believe/can agree that the propeller caused it, there is literally dozens of stainless components on your motor besides the prop, and there is millions of outboards (including e-tecs) that have stainless props and are perfectly OK.
I hope my experience saves someone else.
The dealer called it before we pulled the power head. It might be more common than you know.
What your saying does not make sense
look at how many thousands of engines are sold with stainless props and are now being sold at 10-15 years old without the issues you have
your barking up the wrong tree blaming the prop in this instance
manufacturing defect or poor maintenance and servicing
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