Engine anode missing on a Volvo Penta 2002?

[anastas]

Hi all,

I have a Beneteau First 31 ('92) with a Volvo Penta 2002-variant and recently wanted to
replace the engine anode.
Looking at the schematics, it seems that the anode is placed in the whole that
is also used for supplying hot coolant to a water heater (if installed).
In my boat indeed a water heater is installed, so my question is, do I not have an engine anode?

In addition, I would think that the engine anode is on the "raw/sea water" side of the cooling system, not in the coolant side.
I do not see any such anode on the heat exchanger.

Any thoughts?

thanks

 

[JamesG161]

do I not have an engine anode?

No

My VP22MD has none or spot for one.

Why?

Your engine should be Galvanically Coupled to your shaft which should have Zincs on your shaft.
Shaft Zincs protect the engine and Water heater also.
Jim...

 

[Hollyberry]

The 2000 series Volvos only use an anode if raw water cooled..

 

[john6206]

Hey - I see this thread is a couple years old - but I'm going to tag a question on.

I'm looking at a Gilbert 30+ in Ontario, the broker sent me the survey. The surveyor said the (Volvo Penta 2002) engine had a zinc anode, and for fresh water use that should be replaced with aluminum or magnesium.

Is this an error?

 

[JRacer]

My First 310, also a 92 with a VP 2002 engine does not have one. I also looked to inspect/replace and was as puzzled as you on this but determined that it did not have one.

 

[jssailem]

Hi John.
I could have said: "No, the surveyor is correct."
But that would have generated another question... Why?
It has to do with the various metals' places on the periodic table and how easily they give up electrons when submerged in water.
Here is a boating sight that discusses the various elements used to control engine corrosion.

Choosing the Right Sacrificial Anode | Boating Mag

Sacrificial anodes prevent galvanic corrosion of your boat’s metal props, lower unit, shafts, struts. Learn which metal best suits your boating environment.

www.boatingmag.com

 

[dlochner]

Zinc is ineffective in freshwater. In freshwater the zinc forms a hard shell that insulates it from the water rendering ineffective. Both Magnesium and Aluminum anodes do not have this problem. You will need to use Aluminum or Magnesium shaft and prop anodes too. Over on Lake Ontario I've been using Aluminum, they tend to be a bit less expensive and work just as well.

Check with Boatzincs.com for the engine and shaft anodes. Best prices, best selection, fast shipping.