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Old 06-06-2023, 12:22 PM   #1
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Zinc anodes on a Yanmar 6LY3-UTP

Can anyone please confirm that this model Yanmar has only one zinc on the entire engine? Manuals are unclear.

Thank You,
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Old 06-06-2023, 02:14 PM   #2
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I think there are more than one. This is what my 6LY 370 had:

Two on the main heat exchanger on the front end and another one on the back.
One (but sometimes none as this is a US sourced exchanger and it varies with the supplier) on the tranny cooler.
One on after cooler.
One on the lube oil cooler underneath and forward.

David
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Old 06-06-2023, 02:59 PM   #3
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Thank you David.
What year is your engine please ?
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Old 06-06-2023, 03:49 PM   #4
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I have had two boats with that engine, one a 2006 MS 34T and the other a 2003 MS Pilot 34. Both engines were virtually identical except that the tranny cooler on the Pilot 34 didn't have a zinc.

I have attached a pic showing the two zincs on the front of the main heat exchanger, just above the horizontal V.

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Old 06-06-2023, 04:53 PM   #5
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Thank you David

My engine is a 2010 and I had one Yanmar mechanic insist there’s only 1 on the whole rig located on the main heat exchanger. Thank you for the info !!!
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Old 06-06-2023, 06:07 PM   #6
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I have a 2008 W Yan 6LYA and agree with David's info.
My tranny cooler has an anode.
I find the oil cooler anode erodes faster than others and have started to use a longer anode rod there which seems to help.
I an in fresh water and switched to all alum anodes.
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Old 06-06-2023, 06:15 PM   #7
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That’s is very helpful. Thank you.
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Old 06-06-2023, 08:31 PM   #8
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Quote:
Originally Posted by JWA1967 View Post
Thank you David

My engine is a 2010 and I had one Yanmar mechanic insist thereís only 1 on the whole rig located on the main heat exchanger. Thank you for the info !!!
You need to get a better mechanic.

David
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Old 06-06-2023, 08:48 PM   #9
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Quote:
Originally Posted by DavidM View Post
You need to get a better mechanic.

David
Unfortunately that may prove difficult…. There aren’t that many good ones around it seems.
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Old 06-07-2023, 06:09 AM   #10
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John
Check your Yanmar engine manual. If you don't have one you should be able to find it online. If unable to locate one check BoatDiesel.Com.
In order to download you will need to join but a search to see what is available can be done w/o a membership.
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Old 06-07-2023, 07:48 AM   #11
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I have a 2001 model. Mine has 3 in the heat exchanger. Two forward as in the above pic and one towards the back of it. Than one for the oil cooler and one for the fuel cooler.

Total of 5 just for the engine. Than my transmission/twin disk has two.
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Old 06-07-2023, 08:23 AM   #12
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Thank you for the info. The engine manual does not give the location and number of zincs - just when to change them !
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Old 06-07-2023, 09:58 AM   #13
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I looked up the Yanmar 6LY3-UTP- https://www.yanmar.com/marine/product/engines/6ly3-utp/ and not surprisingly the port side of the engine where the main heat exchanger is located doesn't look anything like the 6LY 370 we have been talking about.

The starboard side looks similar so I have uploaded a photo that shows the three locations that may have zincs: tranny cooler, after cooler and lube oil cooler that are shown in the starboard side pic.

To find the locations (if any) of the zincs on the main heat exchanger, I would just get a wrench and unscrew any caps that look like they might be zincs and check them out.

David
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Old 06-07-2023, 10:02 AM   #14
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David - this is very helpful. I really appreciate your info.

Thank you !!
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Old 06-07-2023, 12:29 PM   #15
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Your mechanic may actually be right about one zinc and I bet it’s the one on the lube oil cooler.

Looking carefully at the stbd side pic, the arrow points to a blank boss where on the 6LY 370 is where a zinc cap is. No zinc on the tranny cooler and there may be none on the main heat exchanger.

Yanmar may have redesigned the RW system to let it all drain down when the engine stops except for the lube oil cooler. Leaving RW in 24/7 causes most of the corrosion and with a redesigned system, they decided to live with any corrosion while running.

David
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Old 06-07-2023, 01:43 PM   #16
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I have a 6LP and I have 6 zinc's. Apples and Oranges, but...........Your 6LY has ONE??
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Old 06-07-2023, 02:02 PM   #17
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https://www.manualslib.com/manual/88...s.html?page=54

Section 4-2 (Page 54)

According to the 6LY3 Service Manual, there appears to be only one and it is listed as being in the heat exchanger.
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Old 06-08-2023, 10:39 AM   #18
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I reached out to Yanmar directly and yes there is only one zinc on the heat exchanger.

Thanks for all the info !!!!!
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