Anodes on Yanmar 2gmf?? - SailNet Community
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Anodes on Yanmar 2gmf??

Does anyone know if there are anodes on the 2gmf (fresh water cooled)? The manual shows anodes for the 2gm version but unsure if the 2gmf requires anodes to be be inspected/changed.

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Re: Anodes on Yanmar 2gmf??

I'm nearly certain the answer is yes, but my shop manual is on the boat and I am not. I'll bump the thread later in the week if you don't get a definitive answer.
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Re: Anodes on Yanmar 2gmf??

None of the gmf (2gm, 3gm) freshwater cooled engines have anodes, Yanmar says it's because they don't use dissimilar metals in the heat exchanger.

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Re: Anodes on Yanmar 2gmf??

You may or may not have one in the hx.
Id check that
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Re: Anodes on Yanmar 2gmf??

My 3GM30F (and I believe the 2GM also) has a Cu-Ni heat exchanger and has no zinc anode.
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Re: Anodes on Yanmar 2gmf??

I've owned two 3GMF's and one 2GMF and none had anodes.
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Re: Anodes on Yanmar 2gmf??

I spent a lot of time looking for anodes in my 2GM20(f)... There aren't any.
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Last edited by PhilCarlson; 1 Week Ago at 12:51 PM.
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Re: Anodes on Yanmar 2gmf??

Quote:
Originally Posted by PhilCarlson View Post
I spend a lot of time looking for anodes in my 2GM20(f)... There aren't any.
Me too, Phil, I recently spent 45 minutes looking for the transmission dipstick on my new pickup, there isn't one.
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Re: Anodes on Yanmar 2gmf??

Quote:
Originally Posted by capttb View Post
Me too, Phil, I recently spent 45 minutes looking for the transmission dipstick on my new pickup, there isn't one.
I thought for a while that the world has passed me by, is now confirmed for sure!

My understanding on Yanmar GMs
On GMF's (fresh water cooled) with heat exchanges. No anodes.

On GM's (raw water cooled) Yes anodes. One each cylinder.

On my 3GMC , raw water cooled / C= saildrive there are total 3 anodes (zincs as I call them) 2 along side of motor, under exhaust manifold, (one is behind secondary fuel filter) and 3rd is mounted on end next to exhaust elbow.

For saildrives, in addition to external lower, there is an anode up on side of SD.
Opposite side from water intake up high near yellow oil fill cap.
Not all are aware this one exists.

Is an adventure to change them!

Last edited by HUGOSALT; 1 Week Ago at 04:17 PM.
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Re: Anodes on Yanmar 2gmf??

Quote:
Originally Posted by JimsCAL View Post
My 3GM30F (and I believe the 2GM also) has a Cu-Ni heat exchanger and has no zinc anode.
I asked the largest dealer of Yanmars on the west coast and was told there are none. The heat exchanger internals are cupronickel rather than the copper of most others so don't require an anode.
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