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Old 30-01-2018, 17:51   #1
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Yanmar 3GM30F Zincs

My boat has the Yanmar 3GM30F engine. I found in the service manual that there is a zinc located on the cylinder block. Are there any other zincs on the engine or gearbox that I need to be aware of?
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Old 30-01-2018, 20:16   #2
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Re: Yanmar 3GM30F Zincs

From memory I think there are three zincs screwed into the block of the raw water cooled 3GM30, two on the side and one on the back. None anywhere else.

If the F in the model designation denotes fresh water cooled with a heat exchanger I don't know what they have.
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Old 30-01-2018, 22:36   #3
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Re: Yanmar 3GM30F Zincs

Really?! I was told by a reputable source that there weren't any zincs on my 3GM30F. The service manual that I have covers several different Yanmar engines so do you think that info about the zincs might be referring to something other than the freshwater-cooled 3GM engine?
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Old 30-01-2018, 23:00   #4
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Re: Yanmar 3GM30F Zincs

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Originally Posted by gamayun View Post
Really?! I was told by a reputable source that there weren't any zincs on my 3GM30F. The service manual that I have covers several different Yanmar engines so do you think that info about the zincs might be referring to something other than the freshwater-cooled 3GM engine?
There are no zincs on the 3gm30f,im sure. I lived intimately with that engine for years.
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Old 30-01-2018, 23:55   #5
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Re: Yanmar 3GM30F Zincs

I concur with what is posted above.

No zincs in a 3GM30F
3 zincs in a 3GM30
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Old 31-01-2018, 17:44   #6
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Re: Yanmar 3GM30F Zincs

I have a pair of 3GM30F, hitched to sail drives if that makes a difference, and they have zincs in the block. They are European, if that makes a difference.
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Old 31-01-2018, 18:13   #7
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Re: Yanmar 3GM30F Zincs

No zincs on the 30F
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Old 31-01-2018, 18:28   #8
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Re: Yanmar 3GM30F Zincs

I seem to be in the minority here!

Actually, I wasn't aware of the zinc (on my motor, at least) until I had to remove the heat exchanger. It wasn't obvious until then.
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Old 31-01-2018, 18:31   #9
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Re: Yanmar 3GM30F Zincs

F means Fresh water cooled, so it doesn't need zincs. There are no zincs.

Change the water annually (I use distilled water) and add anti-corrosive or antifreeze.
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Old 31-01-2018, 18:37   #10
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Re: Yanmar 3GM30F Zincs

And I should say that I found little erosion to this zinc even though it must have been 8 - 10 year old.

Replaced it then, but not since.

Perhaps the raw and fresh share the same block, the hole is there, and Yanmar just screws a zinc on the plug.

Or maybe the choice between fresh and raw is made after this point.
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Old 31-01-2018, 18:39   #11
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Re: Yanmar 3GM30F Zincs

The hole is there but no zinc. Sometimes the plug in the hole leaks.
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Old 31-01-2018, 20:33   #12
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Re: Yanmar 3GM30F Zincs

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The hole is there but no zinc. Sometimes the plug in the hole leaks.
Where? Inside the heat exchanger? Where exactly should I be looking. This is really curious to me.
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Old 01-02-2018, 03:57   #13
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Re: Yanmar 3GM30F Zincs

The hole is in the block.

It should be quite visible on a raw water cooled engine, but the heat exchanger makes it hard to see on a FW cooled engine --at least in the narrow hull of my catamaran as my head doesn't get down low.

But the plug in my FW engine (only looked at one) definitely had a zinc screwed onto it. And I am the original owner.
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Old 01-02-2018, 04:08   #14
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Re: Yanmar 3GM30F Zincs

https://j109.org/docs/Yanmar-3GM30-parts-catalog.pdf

Figure 15.
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Old 01-02-2018, 04:46   #15
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Re: Yanmar 3GM30F Zincs

Figure 15 in link in previous post says there should be no zinc on a 3gm30f.
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