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post #1 of Old 10-24-2010 Thread Starter
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Repowering a motorsailer

Howdy all,

We've just bought a 40ft steel motorsailer project with 2 x Perkins 4108's in it (900 hours a piece). The boat has twin props, twin controls and excellent access to the engines, and weighs 40,000lbs (19 tonnes).

I've read somewhere that these engines:

- continuously leak oil
- are rated at 50hp, but only deliver 25hp at the prop

Now, access under the engines isn't brilliant and being a steel boat, this is a problem for us. I'm also a fan of simplicity and would like to reduce the x2 of everything.

So.... thoughts on repowering? We were thinking a 75hp Penta or Yanmar would theoretically do the same job as both Perkins, plus increase access and storage space. Yes, we'd need to blank off the current prop shafts and add a new one but this is all quite do-able in steel.

For the guys that have done this or know bigger boats with bigger engines, does all this sound feasible?

Thanks in advance.

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