Re: [Amel] SM2K Yanmar RPM

Mark Hayden

Thanks for the info. I'm current with all the filters, etc. The fact that my RPM's are within the same ballpark as when the previous owner acquired the boat from Amel is consistent with that.

Are my RPM's in line with what I should be expecting? Or is there something about the application that makes the RPM's I'm getting OK. If my RPM's are as expected, I'd think there would be other owners who had been told the same thing as me.

BTW, how can you tell if the autoprop reaches full pitch?

Thanks in advance, Mark

--- In amelyachtowners@..., Richard03801 <richard03801@...> wrote:

Do you have clean fuel and Air filters / cleaners is the prop clean and does it reach full pitch. Are you getting over heating when when you run it hard is the Saltwater heat exchange clear. And are the fans running w/fresh air. Last is the turbo carbined up. All these will cause rpm loss. It is not an easy item to solve. We never run wide open a diesel likes a load it does not need to go full bore all the time.

Richard Piller

On Mar 29, 2011, at 19:10, "Mark" <markghayden@...> wrote:

We have a SM2K with an Autoprop. We have been getting somewhat dark exhaust from our engine so we've had a Yanmar serviceman look at it. The Yanmar 4JH3-TE engine is rated at 3800 RPM. When testing the boat on calm water (clean hull, clean prop...), we could got 3100 max RPM, similar to when I purchased the boat. Referring to the maintenance log, the original owner got 3250 max RPM when he tested it around the time of purchase from Amel.

The Yanmar guy I am working with tells me this RPM is an indication the engine is overloaded and is a likely cause for the exhaust. He went further and says that Yanmar would not warranty the engine in this application, given the load, gearing ratio, propeller combination prevents it from reaching the spec'd RPM. The implication being it is a flawed design, which I find hard to believe.

I contacted Amel several months ago about this and didn't get a response. Has anyone been told this before? Is there an explanation for the design?

Thanks in advance,


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