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Old 22-11-2017, 21:03   #1
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Location: San Rafael, Ca.
Boat: Gaff rigged Ketch[Spray]37' on deck
Posts: 283

My customer owns a Columbia 36, with a Atomic 4, and wishes to convert to Diesel, were looking at a Universal M25XP, which will drop in pretty much, my question is: not knowing the prop dimensions and not wanting to haul out or having to hire a diver to measure same, can anyone experienced with this operation tell me the Dia and pitch, believing the set up would be the same for all the Columbia 36'S with an A4. Thanks, Doug.

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Old 23-11-2017, 08:53   #2
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Location: Bayou Chico, FL 32507
Boat: Cal Cruising 46 - SATORI
Posts: 255
Re: re-engine

I had a Columbia 36, "Patriot" in Long Beach, CA late 70's early 80's. It had a 2 cylinder Albin diesel with a fixed 2 blade prop. I changed to a folding prop as I was racing a lot. I suggest you either haul or dive and check out the prop as it could be one of many.

Depending on what you are paying for the new engine, gearbox, etc. the cost of hauling is minor. It is less expensive to buy another prop than have another reduction gear. If you are "over propped", it would be like driving your diesel powered vehicle up a steep hill in high gear. You would destroy the engine in short time.


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Old 23-11-2017, 09:03   #3
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Boat: Tartan 40
Posts: 1,179
Re: re-engine

Beta marine makes a drop in replacement for A4 and should be able to spec the prop
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Old 23-11-2017, 10:05   #4
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Join Date: Jan 2012
Location: Novato, California
Boat: Rafiki 37
Posts: 270
Re: re-engine

as posted it sounds as if you have no idea of what you are doing beyond swapping one engine for another. my first query would be why do you need a new prop if as you say the new engine "which will drop in pretty much" is the same?

You have a customer? imho I only see red flags here.
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Old 23-11-2017, 11:34   #5
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Location: Juneau, Alaska
Boat: Prout Snowgoose 37
Posts: 133
Re: re-engine

If you are in the us, swapping an engine out with something other than a replacement of the same unit triggers emissions laws. A new install is required to meet current emissions standards. If you are the boat owner that is one thing, but doing it professionally, you are taking a heck of a risk.
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