Somebody has to ask ...

I don't suppose this is a Norseman 430 recently purchased at auction?

If so, I was curious if Norseman will be able to supply a new keel?

As to your query, I can't really answer. I suppose part of it is do you want
"new" or do you prefer "cheap"? Since the engines are already getting along in
years, replacing to not seem to bad an options, especially if you can get a
reasonable price and some salvage value for the old stuff. BTW, a friend
replaced a 3GM30 with a 3YM30 on a Prout had very little trouble - the swap was
done mostly in one afternoon. The problems involved mating to the Silette
(sp?) drive, and the extra space taken by the heat exchanger, or something like
that.

As to adding power, you should talk to the builder. If its a Norseman, the 3GM
horsepower is proportional to what I'm used to in my PDQ (10K pounds, 2GM
engines). I'm pretty happy with the speed now, but if there was a magic way to
increase it 30%, I'd take it! The builder should be able to tell you this,
and you might look at the specs for powercats which are sometimes offered with
different engines.

At any rate, please keep us informed about your project - its sounds
interesting.

Good luck,
Jeff www.sv-loki.com
"The sea was angry that day, my friend. Like an old man trying to send back soup
at the deli."






"plugster" wrote in message
k.net...
I need to replace or rebuild 2 Yanmar 3GM30FC saildrives in a 43 foot
sailing catamaran. The old ones are 27 hp with the SD20 saildrive and have
about 3000 hours on them and were submerged in salt water for about 3 days.
Once removed from the water they were taken apart, washed and oiled.

I think I have about 5 options. The first is to have the whole units
rebuilt. Does anyone know a good place to get these rebuilt and what the
cost is? The second option is to replace just the engine and overhaul the
drives myself. Does anyone know where to buy just a new engine and what the
cost is? My third option is to replace the whole system with the newer
Yanmar 3YM30CE version that is 29 hp. I think that this is a bolt in
replacement. My forth option is to replace them with the larger 3JH4CE
Yanmar with the SD40 saildrive. This is the 40 hp version and looks like it
costs about $1500 more each over the 29 hp units. Has anyone replaced the
smaller and older 27 hp unit with the newer 29 or 40 hp unit? I know the
mounts are different with the 40 hp. How much added work and how difficult
is this?

The fifth option is to replace them with other units. Are the Volvo units
identical to the Yanmar units? Can you buy them for a better price? Has
anyone had any experience with other saildrives? How difficult are they to
adapt? What do you think about going to V drives with a conventional shaft
and prop? On all of these I have the option of fixed (about $600 each!) or
folding props (about $1400 each!!!!!) what do people like better and why?

How much more power cruise speed would you expect to have going from 27 to
29 or 40 hp? Most people claim the boat is underpowered with the 27 hp
engines and will do about 7 to 8 knots.

Thanks in advance.
Marg