Zincs

[gfrazzle]

I have been unable to find any reference in the owner's manuals or to physically locate any zincs on my Yanmar 4JH4E (55HP) diesel. Are there any?

Thanks

 

[Rick D]

Probably not. My 4JHE has none nor did my 3GM.

 

[Don S/V ILLusion]

none needed or required

 

[gfrazzle]

Thanks guys!

 

[seadaddler]

Fresh water

If it's fresh water cooled than no need,but need zincs on the prop shaft.
Nick

 

[pete0001]

Yanmar will tell you there are no disimilar metals in the heat exchanger and therefore no need for zincs.

 

[Rick Sylvester]

Oh yeah. Except for maybe

oh, say, the copper tube assembly that fits inside a cast iron housing with cast aluminum caps held with stainless steel fasteners.

Nope. No dissimilar metals there.

 

[stuartsw]

My Hunter 36 is in a "hot" marina, and my dealer has recommended that if I leave the boat idle in there for a month or more, I should purchase a "zinc fish" and wire her to the engine ground. This will supposedly keep my prop zincs from deteriorating too fast.
Where should I install the business end of the cable?

 

[uptownsteve]

My Hunter 36 is in a "hot" marina, and my dealer has recommended that if I leave the boat idle in there for a month or more, I should purchase a "zinc fish" and wire her to the engine ground. This will supposedly keep my prop zincs from deteriorating too fast.
Where should I install the business end of the cable?

I attached an alligator clip to the inside end and ran the cable thru a small hatch (under the dodger). I clip the cable to the prop shaft at the engine end. Don't you think that this is better for protecting the prop than attaching it to an engine ground?

Since I am also in a hot marina, I also use 3 shaft zincs which still have to be changed at my annual haulout.

Steve

 

[stuartsw]

I attached an alligator clip to the inside end and ran the cable thru a small hatch (under the dodger). I clip the cable to the prop shaft at the engine end. Don't you think that this is better for protecting the prop than attaching it to an engine ground?

Since I am also in a hot marina, I also use 3 shaft zincs which still have to be changed at my annual haulout.

Steve

I ended up consulting the manager of the commissioning yard for my boat, who told me that, "since everything is bonded in" in my Hunter 36, I didn't need to go all the way to the drive shaft. He located a bolt for the traveller arch inside the port aft cockpit locker. I clipped it there, secured the line to the port taffrail and sent the fish a swimming. That keeps the clip out of the elements.
He advised that I have the boat dived on in 6 months, (she's in the water 12/12 months) to determine zinc wear, and go from there. There are two shaft zincs on my prop shaft.

 

[Seattle Scott]

Bonding is pretty rare

But if you are bonded then you will have wires runing to your thru hulls/valves unless Marlon. Seems like the arch isn't connected to anything, so question terminating the fish zinc there.

shaft zincs last about 6-8 months in puget sound. My fish zinc terminates on a convient bolt on the engine - don't have to remove to run engine. I just bought a chunk of zinc and made up a "fish" so save some money on the moulded fish that look like a fish.