Yanmar 3GM30f

[Tom Payne]

Fellow Sailors,Quick question regarding Yanmar 3GM30F. I have been informed that the Yanmar 3GM30F does not require zincs due to it being fresh water cooled. I would feel more comfortable hearing this type of information from more than one source. The Yanmar manual makes mention of the zincs, but does not show them on the engine diagram. As always, your input is very appreciated,Happy Sailing,Daddy's Dream

 

[Steve Dion]

We have been asured!

Tom:We have been asured that the "Fresh Water Cooled" versions of the engines do NOT have zincs. This has been hashed over several times each year. I think that I am convinced!

 

[al]

fresh water zincs

the zincs are in the heat exchanger i believe

 

[Bob England]

No zincs on mine

Can't find a single zinc anywhere on my 2GM20F. I sail in Lake Ontario -- fresh water -- and corrosion does not seem to be much of a problem for any part of the boat. When I bought my boat, there wasn't even a zinc on the prop shaft. I put one one, but after three years it has not eroded. After haul-out, I did a little "survey" of the boats at my club, and my best guess is that none of the zincs show any wear and tear, although many look years old. The situation is obviously very different in salt water.Bob.

 

[Steve Dion]

same here Bob E.

Bob:Our boat is the same. We live in fresh water. Venture to the bay once or twice a season. Haul every 2-3 years and the zincs get replaced buy look like new!

 

[Bob Howie]

Zincs in fresh

Ok, here I go again playing the role of the targetable heretic and maybe perhaps with good cause, but since this is a free forum for ideas, here's my usual 2-cents so take it for what it's worth!Yanmar doesn't build fresh and salt water versions of its engines because no one can ever say where the boats will wind up. I think all engines have internal zincs; my brand-spanking-new-damn-near-cost-me-the-ranch Bukh replacement for that boat-anchor-bound stock YSM-12 (actually, I donated it to the Sea Scouts) had a big ol' one in the head's water jacket. I suggest you dig out the operating/service/owner's manual and take a gander at it. There should be a big ol' hexagonal plug in the top of the engine near the thermostat and the heat sensor. That should be the plug into which the zinc screws and then is held in place inside the water jacket.Now, for all you hydrophysicists out there, fresh water is NOT as conductive as salt water, so, no, you will not experience the kind of electrolysis one typically finds in "my" kind of water. However, you can develop electrolysis by just having two dissimilar metals including metals of the same type, but different alloys in contact with one another and bone dry! You can also have what's known as a "DC leak" aboard your boat -- electrically bonding all your fittings is a good idea here -- and the DC current will eat your prop right off the boat. If you have brass/bronze components in contact with other metals, look to see if your brass is turning a kinda weird pinkish color. If you do, you go electrolysis coming from someplace. You can use a good -- I prefer Fluke -- multi-meter to check for errant current. If you have something like this, then having zincs in place will protect you even in fresh water.It never hurts to have 'em; they are relatively cheap and don't forget your rudders since the rudder posts and bearings are susceptible to electrolysis as well.Ok...go ahead...throw bricks at me now if you must!!!Regards to all.

 

[Steve Dion]

Bob H, You owe me a beer!

There are NO, NONE, NADA, ain't any zincs for the 2GM20F or 3GM20F engines. These engines have what we would consider a radiator (aka: Heat Exchanger). The engine has a recirculating system which contains anti-freeze. The engines that are RAW water cooled (no heat exchanger), DO require zincs.I do not know when I am going to collect but you never know. Have a cold one waiting for me!2GM20/3GM30Oil Filter: 124450-35100Fuel Filter: 104500-55710Air Element: 128270-12540Cooling Water Belt: 104511-78780Alternator/Generator Belt: 128670-77350Zinc: 272210-200300Impeller: 104211-42070 (b)Return to Top2GM20F/3GM30FOil Filter: 124450-35100Fuel Filter: 104500-55710Air Element: 128270-12540Cooling Water Belt: 104511-78780Alternator/Generator Belt: 124732-42290Zinc: N/AImpeller: 124223-42091 (c)Return to Top3HMOil Filter: 124450-35100Fuel Filter: 104500-55710Air Element: 124770-12540Cooling Water Belt: 104511-78780Alternator/Generator Belt: 128670-77350Zinc: 272210-200300Impeller: 124223-42091 (c)Return to Top3HMFOil Filter: 124450-35100Fuel Filter: 104500-55710Air Element: 124770-12540Cooling Water Belt: 104511-78780Alternator/Generator Belt: 128695-44780Zinc: 272210-200300Impeller: 124223-42091 (c)Return to Top3HM35Oil Filter: 124450-35100Fuel Filter: 104500-55710Air Element: 124770-12540Cooling Water Belt: 104511-78780Alternator/Generator Belt: 123672-77370Zinc: 272210-200300Impeller: 124223-42091 (c)Return to Top3HM35FOil Filter: 124450-35100Fuel Filter: 104500-55710Air Element: 124770-12540Cooling Water Belt: 104511-78780Alternator/Generator Belt: 123672-42290Zinc: n/aImpeller: 124223-42091 (c)Return to Top2QM15Oil Filter: 119660-35150Fuel Filter: 104500-55710Air Element: 124770-12540Cooling Water Belt: 104514-77350Alternator/Generator Belt: 105582-77790Zinc: 272210-200300Impeller: 104211-42070 (b)(g)Return to Top2QMOil Filter: 424085-35111Fuel Filter: 124220-35210Air Element: 124770-12540Cooling Water Belt: N/AAlternator/Generator Belt: 12420-42291Zinc: Impeller: 124223-42091 (c)(h)Return to Top2QM20/3QM30Oil Filter: 124450-35100Fuel Filter: 104500-55710Air Element: 124770-12540Cooling Water Belt: N/AAlternator/Generator Belt: 25117-003151Zinc: 272210-200300Impeller: 124223-42091 (c)(h)Return to Top3QMOil Filter: 124450-35100Fuel Filter: 124220-35210Air Element: 124770-12540Cooling Water Belt: N/AAlternator/Generator Belt: 124240-42291Zinc: #Impeller: 145410-46090 (d) (h)Return to Top3JH2EOil Filter: 119305-35150Fuel Filter: 129470-55701Air Element: Cooling Water Belt: 171087-42280Alternator/Generator Belt: N/AZinc: N/AImpeller: 129470-42530Return to Top3JH2-TEOil Filter: 119305-35150Fuel Filter: 129470-55701Air Element: 129470-12330Cooling Water Belt: 25132-004500Alternator/Generator Belt: N/AZinc: N/AImpeller: 129470-42530 (e) Return to Top4JH(2) E SeriesOil Filter: 129150-35150Fuel Filter: 129470-55701Air Element: 129470-12330Cooling Water Belt: 25132-004600Alternator/Generator Belt: N/AZinc: N/AImpeller: 129470-42530 (e) Return to Top4JH2-UTEOil Filter: 129150-35150Fuel Filter: 129470-55701Air Element: 129574-55710Cooling Water Belt: 25132-004600Alternator/Generator Belt: N/AZinc: N/AImpeller: 129470-42530 Return to Top4LH-TE/HTEOil Filter: 127695-35150Fuel Filter: 41650-502320Air Element: n/aCooling Water Belt: 121850-42280Alternator/Generator Belt: N/AZinc: N/AImpeller: 127610-42200 (f)Return to Top4LH-DTEOil Filter: 127695-35150Fuel Filter: 41650-502320Air Element: n/aCooling Water Belt: 121850-42280Alternator/Generator Belt: N/AZinc: N/AImpeller: 127610-42200 (f)Return to Top6CX-ETEOil Filter: 127695-35100Fuel Filter: 127695-55630Air Element: 127695-18530Cooling Water Belt: 25132-004250Alternator/Generator Belt: N/AZinc: 126410-09300Impeller: 128620-42200Return to Top6LY-STEOil Filter: 119593-35100Fuel Filter: 41650-502330Air Element: XN199613Cooling Water Belt: 119593-42280Alternator/Generator Belt: N/AZinc: N/AImpeller: 119593-42200Return to Top6LY-UTEOil Filter: 119593-35100 *Fuel Filter: 41650-502330Air Element: XN199613Cooling Water Belt: 119593-42280Alternator/Generator Belt: N/AZinc: N/AImpeller: 119593-42200Return to TopSB8Oil Filter: 104271-35130 Fuel Filter: 104500-55710Alternator/Generator Belt: 105282-77790Zinc: 104211-41300Impeller: 104211-42070 (b)Return to TopSB12Oil Filter: 104271-35130 Fuel Filter: 104500-55710Alternator/Generator Belt: 105582-77790Zinc: 104211-41300Impeller: 104211-42070 Return to TopSVE8Oil Filter: 104271-35130 Fuel Filter: 104800-55710Alternator/Generator Belt: 105282-77790Zinc: 104211-41300Impeller: 104211-42070 (g)Return to TopSVE12Oil Filter: 104271-35130 Fuel Filter: 104800-55710Alternator/Generator Belt: 105582-77790Zinc: 104211-41300Impeller: 104211-42070 (g)Return to TopYSB8Oil Filter: 104271-35130 Fuel Filter: 104500-55710Cooling Water Belt: 104214-42780Alternator/Generator Belt: 104211-42780Zinc: 27210-200300Impeller: 104211-42070 (g)Return to TopYSB12Oil Filter: 104271-35130 Fuel Filter: 104500-55710Cooling Water Belt: 104514-42780Alternator/Generator Belt: 104514-77350Zinc: 27210-200300Impeller: 104211-42070 (g)Return to TopYSE8 Oil Filter: 104271-35130 Fuel Filter: 104500-55790Cooling Water Belt: 104214-42780Alternator/Generator Belt: 104211-42780Zinc: 104211-41300Impeller: 104211-42070 (b)Return to TopYSE12Oil Filter: 104271-35130 Fuel Filter: 104500-55790Cooling Water Belt: 104514-42780Alternator/Generator Belt: 104514-77350Zinc: 104211-41300Impeller: 104211-42070 (g)Return to Top

 

[Steve Dion]

Bob H., don't give me that BUKH!

Bob:I just figured out what you meant. No Yanmar does not build one for fresh water. They have raw water cooled models and fresh water (anti-freeze) cooled models.I love this site, but sometimes really don't like the fact that you can not see my dumb face so you would know that I am confused.Is my beer ready?

 

[Bob Howie]

Ah..duh!

Ok...y'all got me; forgot about that closed-system cooling thing in that that's the "fresh" water you're cooling with! Gotta admit; don't have much experience with radiators (ok, heat exchangers) on most boats down here. Most are just raw water cooled using good ol' seawater which we seem to have an abundance of...so far. Actually, the Bukh DOES have a fresh-water option but space is so tight in my boat that rigging the heat exchanger through a keel-cooler became a little problematical, so it was off to the raw water cooling method!And, ANOTHER thing; lay off my Bukh! Talk about my girlfriend(s), job, looks, money, my sailing skills or maybe even my lack thereof. You can even say things about my mother cuz God help you if SHE finds out! But, when bad-mouthing starts on my little lifeboat engine, well, them's fightin' words around here and I'll serve up FLAT beer!!!

 

[Bob Howie]

Oh, yeah...Say, Steve

It just occurs to me...you need better reading material! I wonder about a guy who has all that tech spec stuff on the Yanmars at his finger tips. Diversify your library, for God's sake, man! I'll send you one of my flight manuals!!!

 

[Larry Mongeon]

Wrong Question

Sorry folks (Steve too) but FWIW you do need zincs on boat in freshwater. Maybe not on the engine but Bob is right any disimilar metals will go if stray current is present. Remember it does not have to be from your vessel. With 500 boats in marina's there is bound to be at least 1 stinkpot discharging Big Juice. Bob

 

[Steve Dion]

No thanks, I'll keep my feet on earth/water!

Bob:I'll pass on the flight manuals.I saw one of those cute little engines a couple of weeks ago. Nice setup if I do say so myself. I thought they are quiter than the Yannie too. I was really impressed with the dip stick (no pun intended), right up on top where you can actually check it.I hate flat beer!

 

[Steve Dion]

zincs yes, but not on the engine!

Larry:For some reason Yanmar does NOT use zincs on the FRESH WATER COOLED engines.No one was saying that we did NOT need zincs on the shaft.Make mine tall and cold!

 

[Bob Howie]

Steve, your address please

Steve,Send me an e-mail address and I'll send you some pix so you can at least see my dumb face seeing as how we seem to meet one another at the Debate Rock quite often. Mine is bhowie@txucom.net.Later, dudeHowie

 

[Bob Howie]

Larry's point is very, very valid

Listen; while our seconds decide under which spreading oak and at which dawn Steve and I will meet to settle this, Larry brings up a very valid point and that is other boats being your boat's worst enemy. This really happened to me after I first got my '78-30. I had like this big electrolysis problem that was munching zinc like a vitamin

 

[Ed Schenck]

Au contraire Bob!

I have a Yanmar maintenance manual and it has two models on the hard cover, the 'F' and the blank("non-F"). Now this happens to be a QM manual but they definitely made an 'F' version. But I think the 'F' means freshwater ONLY for the internal engine. In other words if NOT seawater cooled(no salt in the engine passages) then no zincs required. The only salt would be in the heat exchanger and that should have a zinc. Unless as in my case it was an add-on. There are two large foldout pages, one with zincs and one without.

 

[Bob Howie]

I could stand corrected

Well, I did make something of a tactical error in this discussion by thinking "fresh water" as in, water other than salt and kinda sorta overlooked the radiator/heat exchanger thing, but, hey, it was a little late and maybe my brain was having a caffeine melt-down. Some engine friends have corrected me in that some engines specifically designed for nothing-but-closed-circuit fresh water cooling wouldn't necessarily have zincs. Fresh-water-cooled engines which are converted to same, but started life as raw water cooled would likely have zincs but only because they started off life as something else, not because they are fresh-water cooled. So, I stand humbly before you all, corrected as I have now chastenly become!!!