New-style 6.2 SeaCore Closed Cooling Question . . .

[tpenfield]

Greetings,

Since buying my 2016 CY 338 w/ twin Merc 6.2 SeaCore I/O's I have wondered about an anode for the heat exchanger. There does not seem to be a place for an anode on/in the heat exchanger.

My previous boat w/ aftermarket (Orca) closed cooling had a place for the anode, but I have yet to find such on the new engines.

However, I am wondering about this Blue Plug . . .
.

.
Its location is such that it would not be a drain, like your typical 'blue plug'. I am wondering if it is there for an optional anode?

Anybody know?

 

[Scott Danforth]

Ted, text me the pic, will send it to my buddy Arty. if you send me the serial number on the HX, He can also tell me which tech put the core bundle together, and who tested it.

 

[Scott Danforth]

actually, looking at where it it, that is most likely where an annode would go - the inlet side of the HX tube side. threads are 1/2-13 with o-ring. anode would be 10mm or 3/8"

will have to pull the end cap to determine how long of a pencil you can use before hitting the dividers

 

[tpenfield]

I'll take a look next time out on the boat to see what the threas look like and how much space there is within.

there is nothing on the Mercruiser parts list that indicates an anode (I find that strange)

 

[Scott Danforth]

threads are 1/2-13. per my guy, its a seawater pressure port for a seawater sensor. however since you already have a seawater pressure sensor on the PS cooler, you could get a small pencil anode in there if you wanted.

 

[dubs283]

Iirc mercury has never used an anode in the oem heat exchangers, at least on recent vintage (past 20 years or so)

I'm thinking their thought is the exchanger is full of raw water even when static so little chance of air/oxygen being present? Dunno, just speculation here

Not a bad idea to install one if you find one that fits. I'd be curious to see how much failure the anode suffers after a season of use

 

[tpenfield]

Iirc mercury has never used an anode in the oem heat exchangers, at least on recent vintage (past 20 years or so)
. . . .

Not a bad idea to install one if you find one that fits. I'd be curious to see how much failure the anode suffers after a season of use

On my Orca (SJE) heat exchangers, the anode was more than 50% gone after 3-4 months. The H.E., being copper is fairly high in the nobility scale, IIRC. but as you say, not a bad idea to add one if possible.

 

[Scott Danforth]

Iirc mercury has never used an anode in the oem heat exchangers, at least on recent vintage (past 20 years or so)

I know they had a bunch in 2010 that still had zincs in them

 

[Scott Danforth]

Ted, take the Hardin marine stainless plugs, tap them 5/16-18 and buy a bunch of 3/8 x 2 anode pencils and trim as needed

 

[Fun Times]

The blue plug is described as an Air vent plug.

 

[tpenfield]

Thanks everyone . . . it might be a project for the off-season.