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Old 12-03-2013
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Replacing an Atomic 4 engine with a Diesel in Vancouver

Hi all,

I have a 35 foot Hughes Sloop currently moored in Vancouver. It has a tired atomic 4 engine that i think now needs to be replaced so I'm looking at repowering the boat. While we're at it I'd like to do some other upgrades such as painting, electrical etc. Of course, I'm not wealthy so looking for as economical a way to do this as possible. Any advice on boat yards or mechanics that would be advisable to contact for quotes? any advice appreciated.
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Old 12-03-2013
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Re: Replacing an Atomic 4 engine with a Diesel in Vancouver

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Originally Posted by Encore View Post
Hi all,

I have a 35 foot Hughes Sloop currently moored in Vancouver. It has a tired atomic 4 engine that i think now needs to be replaced so I'm looking at repowering the boat. While we're at it I'd like to do some other upgrades such as painting, electrical etc. Of course, I'm not wealthy so looking for as economical a way to do this as possible. Any advice on boat yards or mechanics that would be advisable to contact for quotes? any advice appreciated.
Replace with a Moyer-rebuilt Atomic-4?
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Old 12-03-2013
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Re: Replacing an Atomic 4 engine with a Diesel in Vancouver

Beta Marine makes 'drop in' replacements in a diesel.. but not cheap (no repower is inexpensive) Going from gas to diesel also has its complications in cleaning out the old tank, plumbing for a return line, etc.. all do-able but very expensive esp if you're paying someone to do it.

I think you need to set a budget and see what can be done within that.. the DIY involved the more you'll save.
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Re: Replacing an Atomic 4 engine with a Diesel in Vancouver

Join the Moyer Marine forum (free). Learn about the A4 (free).
Figure out what you can do to make it not tired again.
My A4 is 45 years old and still good.
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Re: Replacing an Atomic 4 engine with a Diesel in Vancouver

well if you dont like the a4 Ill take it...

ship down south?

cheers
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Re: Replacing an Atomic 4 engine with a Diesel in Vancouver

I'm doing a A-4 to beta 16. There's a lot to it. I replaced the fuel tank and lines, exhaust arrangement and water lift, electrical, stringers the engine rests on, sound proofing, different prop. Some of this is necessary like higher stringers and prop, some because the old items are at end of life like the steel fuel tank, and some because while the engine is out it's relatively easy, like sound proofing. A question is how long are you going to keep the boat? You won't get the money back from diesel replacement. A moyer rebuild will be lots cheaper but how long is he going to be around to provide that A4 support? while not yet done I found that given enog time and some re-work I can do as lot by myself and bring in the professional at the later stages. like drop-in and alignment.
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Re: Replacing an Atomic 4 engine with a Diesel in Vancouver

you can find good A4 relatively cheap on Craigslist and freshen it yourself. You can pull yours and freshen that yourself as well.

Rebuilding an atomic 4 is not rocket science and tolerances while important are quite forgiving on the A4....
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Re: Replacing an Atomic 4 engine with a Diesel in Vancouver

Repowering to diesel will cost a lot of money - brace yourself for 10 grand at least. Depending what kind of boat you have (how much it's worth) it may not be a financially smart thing to do. I would rebuild the A4 you have. They can be made to last a very long time.
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Re: Replacing an Atomic 4 engine with a Diesel in Vancouver

I'd go with a Moyer rebuild if I was not doing a diesel. The big cost issue is the cylinders, wall pitting, especially if raw water, and out of round. This means boring the cylinders and possibly resleeving. Sleeving and oversize pistons are expensive and you still have an old engine.
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Old 12-04-2013
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Re: Replacing an Atomic 4 engine with a Diesel in Vancouver

You have answered your own question. "Atomic 4 is tired" and you "don't have much money". So do a small overhaul on your present engine. "Tired" may mean neglected.
Use the Moyer forum to put life back into the engine without a complete overhaul.
If all cylinders are over 80 psi, there is life left in her.
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