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Old 12-05-2020, 18:30   #1
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Volvo D2-75 how can there be no anode?

Hi, new to me boat with a Volvo D2-75. I'm doing all the baseline maintenance of all the systems. Currently working on the main engine.

Oil, filters, belts, etc. Looking all over for an anode. Can't find mention of one in the manual, can't find an anode among service parts lists on online resellers (excluding sail-drive anodes).

So, can someone please:

1) Confirm there is no sacrificial anode on the engine, nor the heat exchanger?
2) Explain why this is and how this is possible?

Thanks!
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Old 12-05-2020, 19:11   #2
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Re: Volvo D2-75 how can there be no anode?

Quote:
Originally Posted by ohthetrees View Post
Hi, new to me boat with a Volvo D2-75. I'm doing all the baseline maintenance of all the systems. Currently working on the main engine.

Oil, filters, belts, etc. Looking all over for an anode. Can't find mention of one in the manual, can't find an anode among service parts lists on online resellers (excluding sail-drive anodes).

So, can someone please:

1) Confirm there is no sacrificial anode on the engine, nor the heat exchanger?
2) Explain why this is and how this is possible?

Thanks!
I can't help with D2-75 specifics but I do know that some Yanmar heat exchangers which are made from cupronickel do not have anodes.

My limited understanding of cupronickel is that sacrificial anodes are not necessary. Others may have more detailed knowledge .
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Old 12-05-2020, 20:31   #3
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Re: Volvo D2-75 how can there be no anode?

Well, I'll hope that a combination of good coolant and good quality heat exchanger is saving me! But an anode is such an easy thing to add to an engine, and easy to change, I wish there was one there, if for nothing else, my peace of mind!
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Old 12-05-2020, 23:48   #4
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Re: Volvo D2-75 how can there be no anode?

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Originally Posted by ohthetrees View Post
Well, I'll hope that a combination of good coolant and good quality heat exchanger is saving me! But an anode is such an easy thing to add to an engine, and easy to change, I wish there was one there, if for nothing else, my peace of mind!
I'd NEVER assume the manufacturer knows all.
e.g. Our Yanmar exhaust elbow, if it fails is guaranteed to dump raw water on top of the exhaust valve. It's a simple matter to design an exhaust elbow that makes this impossible. Yanmar would argue that if you replace them according to their maintenance schedule there would be no problem & I'd agree.
However easy to make something that does the same job cheaper, doesn't have the fatal flaw & lasts 4x as long.
Have no idea what the material is on your heat exchanger but maybe you can find out & then add an anode if you think it is necessary.
Research is the key here.
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Old 13-05-2020, 08:10   #5
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Re: Volvo D2-75 how can there be no anode?

Quote:
Originally Posted by ohthetrees View Post
Well, I'll hope that a combination of good coolant and good quality heat exchanger is saving me! But an anode is such an easy thing to add to an engine, and easy to change, I wish there was one there, if for nothing else, my peace of mind!
You can add an anode if you chose. I have no anodes on my Perkins heat exchangers either, I just serviced them....a quick clean, new gaskets, done! Not so much as a blemish. Engine runs every week.
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Old 13-05-2020, 08:38   #6
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Re: Volvo D2-75 how can there be no anode?

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Originally Posted by ohthetrees View Post
Hi, new to me boat with a Volvo D2-75. I'm doing all the baseline maintenance of all the systems. Currently working on the main engine.

Oil, filters, belts, etc. Looking all over for an anode. Can't find mention of one in the manual, can't find an anode among service parts lists on online resellers (excluding sail-drive anodes).

So, can someone please:

1) Confirm there is no sacrificial anode on the engine, nor the heat exchanger?
2) Explain why this is and how this is possible?

Thanks!

The vast majority of marine engines Iíve worked with have no anodes

The vast majority of marine engines Ive worked with are electrically isolated , two pole , no negative common


You should only use an anode if it was specified by the manufacture
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Old 13-05-2020, 10:09   #7
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Re: Volvo D2-75 how can there be no anode?

Quote:
Originally Posted by ohthetrees View Post
Hi, new to me boat with a Volvo D2-75. I'm doing all the baseline maintenance of all the systems. Currently working on the main engine.

Oil, filters, belts, etc. Looking all over for an anode. Can't find mention of one in the manual, can't find an anode among service parts lists on online resellers (excluding sail-drive anodes).

So, can someone please:

1) Confirm there is no sacrificial anode on the engine, nor the heat exchanger?
2) Explain why this is and how this is possible?

Thanks!
I have a Volvo Penta D2-55B engine in my boat and it was the first question I asked the local Volvo Penta dealer...non is required. Confirm with your local dealer.

~ ~ _/) ~ ~ MJH
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Old 13-05-2020, 13:19   #8
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Re: Volvo D2-75 how can there be no anode?

We repowered last year with a Y3M20 while hauled. We installed a zinc under the hulll and attached cables to the mounting studs inside going to the engine and bronze thu-hulls.
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Old 13-05-2020, 13:21   #9
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Re: Volvo D2-75 how can there be no anode?

Hmmm... i don't know why pics failed to attach first time.
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Old 13-05-2020, 13:40   #10
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Re: Volvo D2-75 how can there be no anode?

I've had two different Volvo engines over the years, neither had sacrificial zincs, I could not tell you why.
The Yanmar in current boat does not have sacrificial zincs either..as above, could say why.
Doesn't appear to have been a problem in any of those engines.
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Old 13-05-2020, 16:40   #11
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Re: Volvo D2-75 how can there be no anode?

Bonding system. IF all metals are connected to a bonding system, then a single zinc can act as the sacrificial metal to protect everything connected. All are connected to the negative battery terminal. The bonding system should include shaft wipers and connections for rudder, drive shaft etc. I have set these systems up and was trained to do so by Robert Shorey and Torrey Bartel. Often there will also be zincs on heat exchangers but they should also be connected to the bonding system. The bonding system can be run through a meter with an adjustable rheostat to control voltage and current between the bonding system and zinc... I often ran a 50 ft single engine boat on a 9X12 inch zinc plate. Every through hull and fitting needs to be connected. All can be tested using a standard 1 inch zinc anode and a meter. Good luck! IF all are connected the zinc is the sacrifice.
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Old 13-05-2020, 18:04   #12
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Re: Volvo D2-75 how can there be no anode?

I have a D2-55F which is the non-turbo version of the D2-75. I do have an engine anode, a saildrive anode and a prop anode.
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Old 13-05-2020, 18:21   #13
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Re: Volvo D2-75 how can there be no anode?

My last two boats had everything inside the boat, thru-hulls, engine, etc, all connected together and then led to a grounding plate on the hull. Not a zinc plate, but a copper grounding plate, which was there to provide a base for the Ham/SSB rig. Only zinc on the boat was on the shaft. Can't say I ever had a problem with anything. My first boat had a steel hull, so pretty much everything was grounded and that boat had big 6x12 zinc attached to the hull. That big plate was good for several years at a pop.
But.... a neighboring boat or dock with electrical problems can eat " your" zinc in a heartbeat.

As a retired structural marine engineer, I have often used zinc or aluminum anodes to protect steel sheet pile walls in harbor's, etc . I have seen some strange and unexplainable things in my career. Even working with "specialists" in this field has left me none the wiser. It's part science and part voodoo magic in my mind.
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Old 13-05-2020, 18:21   #14
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Re: Volvo D2-75 how can there be no anode?

I said copper...meant to say bronze..
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Old 13-05-2020, 19:11   #15
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Re: Volvo D2-75 how can there be no anode?

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I have a D2-55F which is the non-turbo version of the D2-75. I do have an engine anode, a saildrive anode and a prop anode.
Engine anode??? Thatís something new..Where is the anode on your engine?

Normally the D2-50, 55, 60 and 75 do not have engine anodes. The sea water touches the sea water pump, which is not normally anoded, and it touches the end caps and tube bundle in the heat exchanger. The tube bundle and both end caps are made of a copper or copper nickel alloy and all are considered galvanically similar and close enough to each other on the galvanic scale to not require anode protection.

That said, if you wanted to install a zinc on the heat exchanger you could remove the drain plug on the HE rear cover and install a small pencil zinc there, or drill and tap the front HE cover on the small flat spot and install one there.
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