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marine_boy

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Reply with quote  #1 
Just curious, any reason for not using something like Duralac on the various stainless steel bolts that screw into the block, leg... etc to limit the possibility of any reaction between the s/s and cast iron?  I know there are anodes for this but as an extra measure?
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E-TEC: E150DSLABA
Serial: 05394420
Prop: Rebel 15"
Huey

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Reply with quote  #2 
No cast iron in your block or leg. 
seahorse

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Reply with quote  #3 

To further clarify the answer, there are no cast iron threaded parts in which stainless steel screws are fastened on Evinrude E-TEC outboards.

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marine_boy

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Reply with quote  #4 
Whatever the metal is, I presume the block and leg are not made of stainless steel and therefore would be a dissimilar metal to the stainless steel bolts used.  So my curiosity remains.
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E-TEC: E150DSLABA
Serial: 05394420
Prop: Rebel 15"
steelhead

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Reply with quote  #5 
One of the main constituents of Duralac is barium chromate  BaCrO4

I can find nothing on the electrical conductivity of BACrO4.  The E-TEC electronically controlled motor system relies heavily on good conductivity through the whole motor for both small and large signals, control and start current flows.  The SS bolts directly in contact with the aluminum heads, block and lower unit provide almost perfect electrical conductivity.  Duralac may very well interfere the high current starter demand, with or add a high resistance return path to these important electrical current flows, affecting the precision control of the EMM over spark ignition system, the EMM controlled fuel injector system, start system, trim system and the G2s integral power steering.

Works great on salt sail boat and commercial fishing boats hardware that is not electrically involved.

Who knows what else is in the proprietary Duralac.

Most likely will also affect the critical torque of head and lower unit bolts.

Not worth the risk.

olypopper

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Reply with quote  #6 
Quote:
Originally Posted by marine_boy
Whatever the metal is, I presume the block and leg are not made of stainless steel and therefore would be a dissimilar metal to the stainless steel bolts used.  So my curiosity remains.


If you are concerned about corrosion I suggest you apply grease to the fasteners as that is the best means of assuring ease of future disassembly. As far as construction of the engine, the block, midsection and lower unit are all aluminum.

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