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06-06-2023, 12:22 PM
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#1
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Member
City: Wilmington, NC
Vessel Name: Restaurantour
Vessel Model: Mainship 395
Join Date: Feb 2022
Posts: 18
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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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06-06-2023, 02:14 PM
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#2
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,640
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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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06-06-2023, 02:59 PM
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#3
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Member
City: Wilmington, NC
Vessel Name: Restaurantour
Vessel Model: Mainship 395
Join Date: Feb 2022
Posts: 18
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Thank you David.
What year is your engine please ?
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06-06-2023, 03:49 PM
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#4
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,640
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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.
David
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06-06-2023, 04:53 PM
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#5
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Member
City: Wilmington, NC
Vessel Name: Restaurantour
Vessel Model: Mainship 395
Join Date: Feb 2022
Posts: 18
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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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06-06-2023, 06:07 PM
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#6
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TF Site Team
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 7,508
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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.
__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
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06-06-2023, 06:15 PM
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#7
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Member
City: Wilmington, NC
Vessel Name: Restaurantour
Vessel Model: Mainship 395
Join Date: Feb 2022
Posts: 18
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That’s is very helpful. Thank you.
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06-06-2023, 08:31 PM
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#8
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,640
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Quote:
Originally Posted by JWA1967
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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You need to get a better mechanic.
David
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06-06-2023, 08:48 PM
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#9
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 20,262
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Quote:
Originally Posted by DavidM
You need to get a better mechanic.
David
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Unfortunately that may prove difficult…. There aren’t that many good ones around it seems.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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06-07-2023, 06:09 AM
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#10
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TF Site Team
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 7,508
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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.
__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
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06-07-2023, 07:48 AM
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#11
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Guru
City: Winthrop
Vessel Model: Pacific Trawler 40
Join Date: Mar 2020
Posts: 755
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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.
__________________
Iggy
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06-07-2023, 08:23 AM
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#12
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Member
City: Wilmington, NC
Vessel Name: Restaurantour
Vessel Model: Mainship 395
Join Date: Feb 2022
Posts: 18
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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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06-07-2023, 09:58 AM
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#13
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,640
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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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06-07-2023, 10:02 AM
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#14
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Member
City: Wilmington, NC
Vessel Name: Restaurantour
Vessel Model: Mainship 395
Join Date: Feb 2022
Posts: 18
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David - this is very helpful. I really appreciate your info.
Thank you !!
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06-07-2023, 12:29 PM
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#15
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,640
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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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06-07-2023, 01:43 PM
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#16
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TF Site Team
City: Westerly, RI
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 4,000
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I have a 6LP and I have 6 zinc's. Apples and Oranges, but...........Your 6LY has ONE??
__________________
Shrew
/SHro͞o/
noun
1. A small insectivorous mammal resembling a mouse, with a long pointed snout and tiny eyes.
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06-07-2023, 02:02 PM
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#17
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TF Site Team
City: Westerly, RI
Vessel Name: N/A
Vessel Model: 1999 Mainship 350 Trawler
Join Date: Jan 2014
Posts: 4,000
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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.
__________________
Shrew
/SHro͞o/
noun
1. A small insectivorous mammal resembling a mouse, with a long pointed snout and tiny eyes.
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06-08-2023, 10:39 AM
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#18
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Member
City: Wilmington, NC
Vessel Name: Restaurantour
Vessel Model: Mainship 395
Join Date: Feb 2022
Posts: 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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