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Old 30 August 2011, 15:20   #11
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Yanmar every time!
Is that because of the profit in spares and repairs?
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Old 30 August 2011, 15:58   #12
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That's nice long post but the Volvo engines use an isolated earth where there is no earth connected directly to the block or drive. I'm not suggesting it may not still be a negative fault but on my engine, it misbehaves if the block is grounded. I've no idea why.
Sounds exactly as Bogmonster describes, while isolated grounds (earths) are extremely common in boats the engine should still be at ground potential or nearly so. They are isolated only to avoid current leaks into the sea.

When you properly ground the engine you are creating problems - which suggests to me that you have a fault somewhere which is "leaking" into the isolated engine. When you bring the engine to earth potential the fault is complete and it dies. When the engine is isolated the fault is incomplete and it runs. Which basically means nearly any circuit not at earth potential maybe to blame.
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Old 30 August 2011, 16:05   #13
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I have a Volvo D6 350 hp with a DPR leg in my Excalibur 8.7, I have personally had no problems bar a supercharger belt wearing, easily replaced. although from reading post's in other forums the Volvo seems to give trouble with regards to it's electronics. Volvo parts can be quite expensive. I have no experience with Yanmar engines but they would appear to be less complicated than the Volvo.
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Old 31 August 2011, 15:29   #14
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Is that because of the profit in spares and repairs?
If only!!!
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Old 01 September 2011, 03:22   #15
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I would echo the Yanmar recommendations - don't forget the drive for the 320/370 is a duoprop drive as well!
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Old 01 September 2011, 06:01   #16
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Originally Posted by jwalker View Post
That's nice long post but the Volvo engines use an isolated earth where there is no earth connected directly to the block or drive. I'm not suggesting it may not still be a negative fault but on my engine, it misbehaves if the block is grounded. I've no idea why.
Interesting, not come across that idea before but IMHO the automotive 'common earth through the block' system is relatively robust because there are lots of earth points onto a whopping lump of metal.

If there isn't a common earth and there are lots of fiddly little earths to every individual circuit, probably via a few earth header joints as well, I'd probably be even more likely to think it is an earth fault. Header joints can be a PITFA on dry land never mind in the world where electricity is green and furry.

From what you say, maybe also worth the OP checking to see if his block IS grounded, that may be the problem?
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Old 18 August 2013, 22:51   #17
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Hi, I am just installing a Yanmar315, ZT370 combo & was wondering if you have any further info (from memory) on the ZT350 failure, was it an alignment issue or overheating? Was the the raw water intake a leg only, leg/sea cock combo or was the engine sea cock intake & leg separate? Also did you get to go out on the 315/ZT370 combo?
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Old 19 August 2013, 00:30   #18
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If you're going to work the sterndrive really hard you might be better investing in something like this:

Konrad Marine Propulsion Products
If you are towing and need heavy duty, Martini is correct. Their most robust stern drive can handle 1200 Nm of torque. I have a feeling no other manufacturer can say that.
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Old 19 August 2013, 01:03   #19
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From what I hear, the Volvo is very nice but is very complicated - I'm told that they drop into "limp home" mode if they are not happy, and they're not happy quite often. If you have a Volvo dealer nearby to do the electronics work - fine. If not, Yanmar.

I would agree with Martini about the new Yanmar V8 370hp - I've used the 315hp and it was a pleasure to drive, but the V8 is a similar weight and I hear the price is OK. C'mon - Twin Turbos! Imagine the sound!

I have personally witnessed the demise and death of a Yanmar ZT350 leg (on the 315hp) and Yanmar have upgraded the clutch packs on them since. The ZT370 has this upgraded mechanism as standard but I'll be very interested to see how they perform over time. I hope to get a 100Nm spin on Saturday with the 315/ZT370 combination, so I'll report back...
Hi, I am just installing a Yanmar315, ZT370 combo & was wondering if you have any further info (from memory) on the ZT350 failure, was it an alignment issue or overheating? Was the the raw water intake a leg only, leg/sea cock combo or was the engine sea cock intake & leg separate? Also did you get to go out on the 315/ZT370 combo?
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Old 19 August 2013, 03:55   #20
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Hi Boofy,

The ZT350 clutch wasn't up to the job. I don't think it had anything to do with heating/cooling, more that it couldn't handle the torque. The water for the combo was all introduced from the leg, IIRC. Yanmar issued a FOC replacement clutch mechanism for existing ZT350s and further beefed this arrangement up for the ZT370s as they have to cope with the huge torque from the new V8.

I did get a drive in the 315/370 combo. It was a very smooth change and ran well, although I think that the leg gearing didn't suit the boat in question at that time - since swapped out I believe.
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