Re: [Amel Yacht Owners] Re: Volvo D2-75 for a SuperMaramu
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I got a notice this had not gone through, so here again
another year and still fine. 850 hours on the clock. Early on there was an issue with the turbo and it was replaced under warranty and has been OK since. As I have said before fitting a new engine you will pay as much for the fitting as you do for the motor itself. I avoided that by sitting right on top of the process and doing most of the physical unbuttoning of the old engine and helping where I could with the install. It had identical spacing of the engine mount holes so we just had to make spacers to give the exact height. No alignment problems at all, it just slipped into place. . Had to have a bracket made to take the 24 volt house bank alternator. There was no neat spot for it like the TMD 22 so the bracket is on the front of the motor. You will be amazed at the quantum of the wiring looms that come with it, but I guess that applies to any engine. Given my time over I would do the rebuild, putting a new engine in is a complex business but I have no complaint about the D2 -75. One interesting thing. The TMD was very sensitive to fouling on the autoprop, losing revs, this motor seems impervious, the prop can be covered in barnacles and it still does its 3000 rpm. I can only assume it has a powerful governor that calls on spare power.
As to your revs with the TMD 22. 2800 IS THE CORRECT RPM UNDER LOAD. i'LL SAY IT AGAIN. 2800 IS THE CORRECT RPM UNDER LOAD. Do not replace your engine if that is your "problem" Yes it will cheerfully spin up to 4000 rpm in neutral but 2800 is what you get under load.
On 14 November 2018 at 17:07 "crwggb@... [amelyachtowners]" <amelyachtowners@...> wrote:
You are now a further year in with your Volvo D2-75. How is it going?
I would love to do a rebuild of the TMD22 but it's not vaguely economical here in Hong Kong.
After everything Ive read on the Amel forum I was more of less convinced that the D2-75 was the engine for me too. As such have been googling this engine for reliability and the reading is not good concerning the mechanical data interface unit, some of which it appears Volvo have just recalled. They are now onto their 6th version of the MDI. Have you had any trouble with this item. Although this engine claims to be "electronics free" it's actually not.
Yanmar are quite hard to deal with when it comes to the isolated negative earth with huge lead times, which has got me running back to Beta ....which is where I actually started.
The Beta man looked at the SM and the power curves for the TMD22A. None of us have ever got that engine above 2800 rpm which is actually at best 60HP! 78 HP doesn't occur until 4500rpm. We have all been sailing round the world quite happily with that out put for many years. He suggested to me the BETA 60 was the the ideal replacement as it almost exactly replicates that part of the TMD22A power curve that we've only ever been able to use but at a higher torque. These days every one seems determined to put bigger and bigger engines in their boats, but I'm not convinced!
If you've time I'd love to hear how your D2-75 is going?
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