Pencil Zinc location for Yanmar 2GM - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 04-04-2014
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Pencil Zinc location for Yanmar 2GM

I am moving my boat to salt water this Spring and want to inspect/ install new pencil zincs in the Yanmar (if there are any). Where are they located on the engine? and how often should I inspect them once in the Gulf of Mexico?
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Old 04-04-2014
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Re: Pencil Zinc location for Yanmar 2GM

My 3GM30F has no zincs due to the heat exchanger material (Cu-Ni). I suspect your engine is the same.
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Old 04-05-2014
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Re: Pencil Zinc location for Yanmar 2GM

a 2GM raw water cooled motor, will have zincs in engine.
My 3GM raw water cooled motor has 2 zincs on starboard (fuel
filter/dip stick) side and 1 in back.
The 2GM raw water should have 2 zincs, 1 in the block on the dip stick side, just behind/above it . A second is on the rear side of the head. Check manual, should be available free on line.
...(1 could be hiding behind fuel filter like my 3GM)
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Re: Pencil Zinc location for Yanmar 2GM

http://j30.us/files/Yanmar-2GM20-Parts-List.pdf

Figure 1, part 18 is the zinc. Part 16 is the plug that holds it; it has a fairly large hex head on it and screws directly into the stb side of the block (in a standard installation).

Figure 11, part 24 is the zinc. Part 22 is the plug; it screws into a cast iron plate (part 19) that attaches to the back of the head.

Don't be surprised if you need penetrating oil, a cheater bar, and some choice language to get the plugs out. You can get the zincs at West Marine, or on-line from a number of sources.
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Re: Pencil Zinc location for Yanmar 2GM

Quote:
Originally Posted by JimsCAL View Post
My 3GM30F has no zincs due to the heat exchanger material (Cu-Ni). I suspect your engine is the same.
After lots of reading in this any other places, I agree that the Yanmar 2GM20F (fresh water cooled- has antifreeze canister) indeed has NO zincs in it - due to the unique corrosion resistant alloy used in the heat exchanger (the only part of the engine to contact sea water). The 2GM20 (entirely sea(raw) water cooled) does have the pencil zincs since the sea water contacts various parts of the engine block during its cooling cycle.

I ran across this info during my research. . . There is a lot of controversy surrounding the proper use of zincs and electro galvanic corrosion in general and I encourage everyone to be aware that there is a huge difference in the high quality marine Bronze (which is copper+Tin alloy) through hulls and fittings and some BRASS (which is copper + Zinc alloy) thru hulls and fittings/ adapters being sold. Attaching a brass fitting to even an excellent bronze thru hull or valve creates a high potential for corrosion and catastrophic failure even if you electrically bond everything together. The Zinc in the alloy acts just like a zinc should !! Just sayin' -- know what is on or being put on your boat!
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Old 04-15-2014
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Re: Pencil Zinc location for Yanmar 2GM

yes - one of the anodes is hidden behind the fuel filter - a really dumb location because you will probably have to take the fuel system apart to get proper access with a ratchet wrench with a 25mm (or very close imperial equivalent) socket - dont try anything else - it takes a lot of torque to get these puppies out and I see several posts where people have "rounded" the anode holder hex head (presumably using a monkey or pipe wrench) and now cant get them out.........

Last edited by uaglt; 04-15-2014 at 08:29 PM.
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