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Old 03-17-2023, 08:13 PM   #1
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2005 Msinship trawler, single 370 issues?

Hi all
I’m considering a 2006 34 trawler.
Love the high bulwarks, huge bridge deck and great “couples boat” interior.
Engine room access is tight for an arthritic guy like myself…
How are the 370s? I’m a sailor and would run 6-7 knots most often.
Fuel burn at that speed? (Other single 370 owners reply)
Are there known issues? Engine or boat?
Things I should look for?
General complaints…. As well as praises?
Comments and concerns from owners or former owners
Thanks
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Old 03-17-2023, 09:03 PM   #2
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I owned a 2006 34T with the Yanmar single. It is a great boat. Slow cruising at 7 kts will require 2.5-3 gph. Fast at 13 kts will burn 10 gph.

The Yanmar 370 is a great engine with no known vices. I didn’t have any problems crawling around the engine room. I thought it was quite open, but I had no generator.

Go for it!!!.

David
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Old 03-17-2023, 09:22 PM   #3
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Thanks!
Appreciate the reply and info on fuel burn and your opinion on the 370.
I expected less fuel burn at 7 knots..
That not terrible, but my former Nordic Tug 32 was about 1.5 to 2 at 7
Glad you liked the boat. I can see why
Now
As to no problem crawling around engine room, but no generator, Ill bet no arthritis too 🤣
Its doable for me, just not as flexible as I used to be
Thanks again.
Appreciate it
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Old 03-17-2023, 09:58 PM   #4
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I spent hours inspecting a later year 395 for sale. Liked it a lot but, with Yanmar 6?LY, and generator, ER was an incredibly tight crawlspace. My IG36, and current boat, both with twins, are way more accessible. Deal breaker was fresh water tankage, I think about 160L, a vacuflush head, and nowhere for more tankage. No generator might solve the water storage problem.
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Old 03-18-2023, 06:21 AM   #5
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I have a 2006 MS 34T for about 2 years now, The boat is GREAT !
Yanmar very easy to work on and get parts. The boat is perfect for 2.
And this forum has a great team & members for support.
Good luck and welcome !
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Old 03-18-2023, 07:56 AM   #6
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Quote:
Originally Posted by SILENTKNIGHT View Post
I have a 2006 MS 34T for about 2 years now, The boat is GREAT !
Yanmar very easy to work on and get parts. The boat is perfect for 2.
And this forum has a great team & members for support.
Good luck and welcome !
I agree completely.
I have had 3 men around / working on my Yanmar eng when we timed valves.
2 of my boat buddies that are mechanics and myself trying to learn from them.
The only tight spot is getting around front of the eng to access the port side. Once there plenty of room. ER requires getting around on hands & knees. I keep a set of knee pads in ER. I dont know any boats this size that have stand up ERs?
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Old 03-20-2023, 12:45 PM   #7
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Quote:
Originally Posted by BruceK View Post
I spent hours inspecting a later year 395 for sale. Liked it a lot but, with Yanmar 6?LY, and generator, ER was an incredibly tight crawlspace. My IG36, and current boat, both with twins, are way more accessible. Deal breaker was fresh water tankage, I think about 160L, a vacuflush head, and nowhere for more tankage. No generator might solve the water storage problem.
The 350/390 single is a much different boat with a different layout than the 395. The engine is extremely accessible on all sides. The generator is in the lazarette out back.
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Old 03-25-2023, 07:20 PM   #8
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We have the Yanmar 6LYA-STP 370 in our 2003 390. never had any issues. Pretty easy to work on. However with the 390 the salon floor comes up so access to the top of the engine is easy. Not sure how the access is on the 34T/395
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Old 03-27-2023, 10:04 AM   #9
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MS 34 Pilot 34 Rumrunner Fuel Consumption

Attached is a little chart I keep around as a guide to fuel consumption on our 2005 Mainship Pilot 34 Rumrunner II with a single 370HP Yanmar 6YLA-STP engine. I cannot recall the source that I lifted it from so if I am infringing on anyone's copy rights I apologize in advance. I realize this is a very different boat from the 34T but thought it might help anyway.

Looking back through our maintenance logs I have found very few if any significant repairs or troubles with this engine over the life of the boat (we have impeccable maintenance logs and work orders since new). A water pump has been replaced, all hoses were replaced with new on general principle (I still have all the original hoses as spares on board just in case), but little else other than routine maintenance and scheduled inspections. The engine currently has around 1450 hours. If well cared for, these Yanmar's should run reliably a good long time. Just keep up on the routine and preventive maintenance.

I would be interested in any feedback on my little fuel consumption chart from other 6YLA-STP owners as to your own experience with fuel burn rates at different power settings.

Thanks all!
Doug
Attached Files
File Type: pdf Arcadia Fuel Consumption.pdf (25.3 KB, 20 views)
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Old 03-27-2023, 10:43 AM   #10
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I use the Yanmar prop curve that gives power and fuel consumtion at various rpm’s. This can be found on Yanmar’s website for that engine. It is about 10% higher than Doug’s chart.

David
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Old 04-12-2023, 06:16 PM   #11
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Zinc Replacement

One additional tidbit based on personal experience; be sure all the pencil zincs are replaced regularly around the engine. I printed a copy of the service manual for the 6LYA-STP off the Yanmar web site in an effort to understand where all the zincs might be hiding (among other reasons). In going over the engine I discovered that two of the six zincs had not been replaced recently and one of those likely had never been replaced at all. It still had silver/grey Yanmar paint on the hex head indicating it might never have been changed since new! The zinc itself was totally gone and I detected some signs of corrosion on the oil cooler heat exchanger it came from.

Bottom line, there are three zincs on the fresh water heat exchanger, one on the transmission oil cooler, one on the engine block on the aft starboard side, and one hiding under the oil cooler heat exchanger on the starboard side. Looking at some of the corrosion lurking at the end cap seams of the oil cooler, there might have been some permanent damage done. I will be looking into this. But the zinc is really hidden and if you didn't know it was there it would be missed.

Looking back through my maintenance records, it appears that only five zincs had been replaced on a regular basis previously. Everyone missed the sixth. That might cost me...

Boat ownership is one big learning experience. I have owned many and it always feels like starting over with the purchase of each one.

Best,
Doug
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Old 04-14-2023, 04:59 PM   #12
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Doug
Can you post some pics?
I'm going from memory but I have only found...
2 on raw/fresh water cooler
1 on ZF tranny cooler
1 on oil cooler - book calls for 2 but yhe only one I found on bottom seems to wear the quickest. I have checked clearance and replaced with a slightly longer one)
1 on Kohler Gen cooler
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Old 04-14-2023, 06:16 PM   #13
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Hi Don, I will happily post some pics but am 400 miles from the boat for the next six weeks so it will have to wait. That said, I can perhaps explain better in the mean time.

I have found a third zinc on the aft end of the fresh water cooler in addition to the two that are side-by-side on the forward top/side of the that same cooler.

Agree that there seems to only be one zinc on the bottom of the lube oil cooler (the one that seems to have been missed in the past on my boat) despite the manual indicating that there should be two. The manual shows a second zinc on the forward end cap of the oil cooler but I did not see one. I am going to check again when I return to the boat just to be sure.

One is indeed on the ZF transmission cooler.

On the 6LYA-STP there is also a fairly large pencil zinc on the intercooler (YANMAR Part No. 119574-18790). This can be found on the aft starboard side of the engine block just aft of the intercooler. It is shown in figure 25 of the Yanmar manual for that engine.

This results in a total of six zincs that I have found and replaced thus far. There is indeed an additional zinc on the NextGen generator raw water cooler making seven non-hull related zincs on the boat total that I have been able to find thus far.

Hope that helps to clarify my findings.

All the best,
Doug
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Old 04-14-2023, 07:50 PM   #14
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Doug
Yes agree re intercooler. Forgot that one from memory.
I'm also away and boat still wrapped. Appreciate tips and will be exploring more soon.
Don
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Old 04-14-2023, 10:56 PM   #15
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The 6LYA-STP engines in our boat have two anodes in the heat exchanger, one in the oil cooler, and one in the intercooler. None in the transmission cooler. The anode in the oil cooler wears out about three times faster than any of the others.
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Old 04-15-2023, 06:53 AM   #16
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Agreed my 6LYASTP transmission cooler does not have a zinc.
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Old 04-15-2023, 10:57 AM   #17
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Agreed my 6LYASTP transmission cooler does not have a zinc.
That varies boat to boat as rge tranny mfgdoesnt supply one. It's up to the builder to select a cooler that meets tranny mfg specs.
Some do some don't even by the same builder.
Best guess it depends on availability when needed.
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