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Clunks... What's going on here?


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Starting to like the idea of 1000Ah of 48V Li and a DC motor slapped on the top of the saildrive...

Something big that require revs / centrifugal force is the prop, and one blade sticking will obviously cause balance issues. I actually wondered if you had a bucket wrapped on the prop. If it was a sh

The thing is with Camshaft, Cranks, Chains, Cogs etc etc and any other solid mechanical timed mechanisms, if they fail in anyway, the issue is not intermittent. They all cause major and even catastrop

Surely Doc its time to go back to the builder? Presumably he was contracted supplied a vessel avec iron sails - in which case your best way forward may be with them not the engine manufacturer?

While undoubtedly your problem, the fault is not yours and all the while this goes back and forward - the closer you move to end of warranty. 

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That is a bullshit solution. Sounds like a junior tech or can't do anything more than service an engine (belts and oil level).

Not understanding how a sail drive gearbox works, it could be something to do with too much oil causing the cones to engage and disengage, but sail drives are mechanical gearboxes aren't they? If it only does it when the engine is hot, and the SD is running, it may be related to gearbox oil temp, expanding volume when hot. Certainly no confidence they either know what they are doing or have fixed it.

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Maybe do the sea trial with the tech on the throttle and get them to floor it for a good bit, if anything breaks I presume they will be responsible ? if not at least it gives you some confidence that it is not likely to be damaging. Its rare I suppose but there is a small chance it might self resolve with time if fuel related.

If they have a spare MDI maybe they could temporarily install that and so eliminate any possibility of it being caused by the smarts ? I assume it could only affect the fuel cutoff solenoid as mentioned earlier.

 

 

 

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I said check oil level in a much earlier post. Too much oil in the Box can cause big problems. The box will overheat badly and that can then cause damage to the clutch cones. Although I have never seen an engine do this before, I wouldn't say it can't. Maybe if the box is getting too hot, it is causing something weird to happen with the clutch grabbing. I assume it has the official Volvo Oil in the box. If it is some poorer quality and it is getting outside it's comfort range, the Oil may not be doing the lubricating job it needs to.
The Oil level must always be checked with the box in gear and at Idle. One of the really big problems occurs when these engines are mounted on a downward angle when coupled to a shaft. It is really hard to judge the correct oil level and the amount of Oil has to be just right. On a Saildrive, I expect the Engine/box to be level. So shouldn't be a problem.

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My experience with Volvo marine diesels is such that I would go for Yanmar every time. And if a boat I wanted to buy a had a Volvo that would almost certainly be a show-stopper for me.

Are they a lot cheaper than Yanmar? Is that why people put them in?

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Sorry Aleana, I disagree. I've seen pretty much all the brands out there have issues. The volvo base engines are fine. Some models have various issues, and that's mostly to do with the marinisation. They all can be sorted out and give good service. Same with Yanmar. And Beta, Nanni, etc. Some of those brands use the same base engines.

So, what's important is the marinisation, the installation, and the servicing.  Then clean plentiful air, clean oil of the correct spec, and a dry, clean engine room  will go a long way to giving any of these engines a good service life.

I have customers with over 20.000 hours on some diesels, but the average life expectancy of a yacht engine in NZ is 3000 hours. They usually don't wear out, they corrode away from lack of use! My old Volvo 2003T had 12,000 hours on it before it finally was not worth maintaining.

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I think it is because Volvo would have to be the most common installation to come across, that due to share numbers, you are going to come across more problems. As IT said, it is usually the additional parts for marinisation that cause issues on the engines themselves. And that tends to be across the board on all makes of engines. The only issue I have with Volvo is the price tag on parts.
 

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