repower part 2

[charlotte94]

Hi folks
I thought I would restart this string as the one below was getting off track.  I am in the process of repowering my 365, the Hakale (289) and there are a lot of options out there.  Can those of you who have repowered shed some light on what they put in, (engine/tranny) and how well it worked out for you.  For me this is a big deal as I will have to live with what I put in for a long time. 

Thanks

[RayNWanda]

Some things to be aware of- The W40 is 37 hp, the ratio in the transmission is 1:1, the v-drive has a 2:1 reduction in it. There are several ways to get in trouble during a repower.

The simplest way is to stay with about the same hp and a 1:1 transmission. If you go up much in hp or change the transmission ratio you can end up in trouble with the v-drive.

[docpatton1]

Here is what I did and my reasonings when I had to re-power my 365.

1). At the time I was repowering I thought I would go with an engine driven refrigeration compressor in addition to my 120 amp alternator. That said it was suggested to me and I agreed that an engine slightly larger than the W40 would be better. The next size engine by Westerbeke is the 55C Four. At first look the engine appeared to be perfect. Physical dimensions are almost identical to the older W40/4-107. Considering that at the shaft it would probably only put out 50 hp. coupled w/ a great price on a new engine it didn't seem a bad choice. I got the hurth transmission that was a 1: 1 ratio.
2). The things I didn't check(it was my first re-power) were: 1. the torque: the V-drive I think is rated for 120 or 150 ft/lbs. I believe the 55C Four is rated at 115 or 125 ft/lbs(it has been over a yr since I re-powered), either way I lucked out and was under the max torque allowed for the v-drive. 2. the exhaust: the exhaust hose for the new engine needed to be 4" vice the 1 1/2" to 2" of the older engine.That meant larger hose, larger exhaust pot, and a huge transom fitting. 3. I didn't measure from the drive shaft to the bottom of the oil pan. This was a CRITICAL dimension and no matter what I did I couldn't get the shaft to line up with the transmission coupling. This required that I completely tear out the old engine bed and redesign it from the ground up.
3). All that said I do really like my new eng and tranny but I would have saved my self a HUGE AMOUNT of work and stress had I just repowered w/ a W40. I hope this helps, feel free to contact me if you have any questions.
Chris