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Steve
I assume that you found my webpages with my repower notes.
http://www.richardcarter.net/repower/I’m not familiar with the W63, but I think the specs are listed here.
http://www.westerbeke.com/productBrochures/63D%20Four-1.pdfThis shows that your engine redlines at about 4000 rpm. You’ll want a replacement that has about the same speed range. The new Yanmar 4JH4-TE is spec’d at 3200 RPM. The older 4JH3-TE was spec’d at 3800 RPM. A rebuilt 4JH3TE might be a better choice. You could replace your propeller to adjust to a different engine or change the gear reduction in the transmission or V-Drive but it’s easier to keep everything the same. Verify that the engine turns in the same direction as your old engine. You might want a new propeller anyway since the Yanmar has a lot more torque. You should plan on cruising with your prop speed at around 1000 RPM. Do the math and figure what your best gear reduction is. If you’re way out at 1500 RPM, you’ll cavitate unless you put a tiny prop on there.
Another choice is the TAD Cummins 65. It has a slower RPM range and might be a better choice if the gear reduction works. You’d have to deal with TAD however. Their customer relations aren’t very good. They are nearing the end of production but I heard that they had a few left. Parts shouldn’t be a problem since it’s a common commercial engine. We have one in my yacht club travel lift.
I really like my 4JH3-TE. At normal cruising speed (2800RPM, 7kts), the engine just purrs. I can raise the throttle to 3800 RPM and kick up a powerboat wake running at about 7.8kts. I rarely do this because it sucks fuel with little speed improvement.
It’s difficult to add a high output alternator to the Yanmar. The pully arrangement doesn’t allow swapping in a bigger belt. I had to fabricate a common rail accessory arrangement. That was a lot of work. You can probably fit in about an 80A Balmar or equivalent. You might contact Balmar and ask if they have a drop in for whatever engine you pick. I think the Cummins engine has an optional high-output alternator option.
What do you have for a transmission? You might keep your existing transmission. It should bolt to the Yanmar with proper spacers. A different transmission might give you a better gear reduction however.
I had to fabricate a new engine bed. The engine mounts for my Yanmar were lower than what my W60 had. Compare engine drawings to see how they compare with what you have now. The cummins might drop right in.
Rich
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Not being much of a mechanic myself, when I as fussing with my prop I got
advice from a couple of prop shops and (mostly) followed it. Guys that do
this for a living are most likely to know how to solve your prop problems.Tor
Silverheels, P-424 #17
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check out a Campbell sail prop-they are designed specifically for sailboats and I’ve purchased 2 of them and the last one was for my Pearson 424.I replaced a worn out maxy prop.The campbell prop is fast,powerful in forward and reverse and is a smaller prop, so less drag,also a brass machined prop and priced 500-800 approx.
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Joe Shimkonis
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$500 to $800? Really? For that I do believe I’d switch.
Tor
Silverheels, P-424 #17
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Good resource. Thanks.
Tor
Silverheels, P-424 #17
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