Repower - CD 36

[Bernie]

Having recently pulled the old, rusty Perkins out of my 36, I'm busy researching my re-power options and am hoping to draw on the wisdom and experience of those who have already been through it...Right now, I'm leaning towards to Yanmar 3JH4 and have some specific questions for those who are in the know...

1. Did you adapt to the existing bed or remove it and glass in new stringers or Robinhood bed?
2. Was the optional down angle gearbox used and what reduction was chosen? I think the options are 2.33 or 2.64.
3. Was the high rise exhaust elbow used? Any other particulars related to the exhaust installation? I've learned form posting that the diameter will increase to 3"...
4. I assume the original stern tube was used as changing that would probably lead me back to rebuilding the Perkins? Was the original shaft still used and how was any change in the length compensated for?

I think that is all for the moment...Your comments and advice are greatly appreciated...

Bernie

[Parfait's Provider]

Replaced rusted and bulging bed with Robinhood 36 bed. It was a tight fit.

New SS shaft, new stern tube, room for flex coupling and dripless seal.

Did not use Yanmar mixer. Anyone need one?

New exhaust system; I think it is 4" with flapper at transom and a 360° loop inside lazarette.

New Prop with different pitch (and diameter?)

Used a control panel second, from Hunter as I recall, that has all the bells and whistles and fits in the Perkins panel space. Instruments had been oversprayed for some stupid reason, but they cleaned up perfectly.

Sold the Perkins to an Amel Maru owner who had over 7,000 hours on his 4-108 and never looked back even though it was expensive.

The Yanmar doesn't leak - yet. I suppose when it is 20 years old it might.

Managing the yard was a problem from 150 miles away. It took way too long.

Good luck.

[Parfait's Provider]

Not sure, I'll try to check on which tranny was used. I think it was the down angle, but the ratio escapes me completely.

[Bernie]

Hi Ken,

Thanks for the quick reply...A couple of follow-up questions...I'm not sure about my nomenclature on the stern tube issue...Did the location where the shaft passes through the hull have to be changed for the new installation, i.e. bad angle? Also, I would be curious what kind of mixer was used instead of the one supplied with the Yanmar...I'm assuming the angle to the muffler was not ideal or was it related to the rise that was needed to get the elbow above the waterline?

Thanks again,

Bernie

[Parfait's Provider]

Oh, that's in real estate....

I think the shaft tube is in the same place but the angle changed a bit, not enough to change the thrust much, but enough to warrant a new tube.

The elbow issue was related to getting above the waterline.

As thorough as John Deaton can be, he might have a file with all sorts of notes. I do not.

http://www.deatonyachts.com