Re: [Amel Yacht Owners] Yanmar 75HP - Cannot go over 2300 RPM
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I had the same problem with Kimberlite. Even though when I hauled her and tried to wiggle the blades of the autoprop they seemed normal. After exhausting all other possibilities , I spend a day and rebuilt the autoprop.
Voila back to 3500 rpm. I also rebuilt the prop at about 3500 hours.
The autoprop is a sensitive beast and the slightest out of balance will kill your rpm.
Kimberlite Amel Super Maramu #376
From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Monday, January 09, 2017 12:18 AM
Subject: Re: [Amel Yacht Owners] Yanmar 75HP - Cannot go over 2300 RPM
Hi Vlad and Dominique,
AutoProps require regular maintenance. If you haven't done that in a couple of years, that may be your problem. There are some other threads on this forum that discuss this vis a vis low rpm. Just spinning the blades on the hub doesn't tell you much. They can feel perfectly free wheeling, and still be a problem.
If you don't run your engine hard on a regular basis, you can get a serious buildup of carbon in the turbo and exhaust elbow. That's the second place to look.
Let us know what you find.
From: "Vladimir Sonsev sonsev52@... [amelyachtowners]" <amelyachtowners@...>
I also have 75 HP YANMAR engine 4JH3-TE. I also can't develop more than 2200-2500 RPM.
Autoprop ask me for transmission gear ratio. The label on my transmission is gone. I requested this information from Amel. I am waiting for a reply now.
Autoprop also ask me to conduct some tests. I can't do the tests now because my boat is on hard.
Happy New Year 2017
Yanmar 4JH3-TE - 3600 hours - 1500 hours maintenance.
A New Zealand mechanic replaced the injectors with Yanmar ones I provided and sourced in the US [Niemiec] Both mechanic and my US provider confirmed that it was the correct part #.
However and since I cannot go over 2300 RPM.
The smoke is pretty transparent neither black or white.
I browsed the internet, got a lot of ideas, but nothing which jumped out.
I suspect it is related to the Turbo - over 2300 RPM - that I have not used much and realized I should have.
Suggestions greatly appreciated