Advice for new Atomic 4, gas, owners - Page 2 - SailNet Community
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post #11 of 34 Old 06-20-2011
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tommays,
I am looking at replacing some gauges and am really impressed with your set-up. Can you tell us where you found that panel ? It's exactly what I'm looking for.

Thanks,
Kirk
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post #12 of 34 Old 06-20-2011
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Clearance Items, Overstock, Sales - Ocean Equipment


its and EP162 on clearance for 99 dollars

I just used the front 1/2 and add a gasket IF you have a pedestal it will mount right on it

1970 Cal 29 Sea Fever

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If a dirty bottom slows you down what do you think it does to your boat
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post #13 of 34 Old 06-25-2011
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Two things I would add for the A-4. Get the Moyer service book on the engine,and get a carbon monoxide detector. I got the CO detector because the engine was 30 years old and stuff fails. As I was bringing the boat hom from the Chesapeake my daughter was sleeping below on the long power trip down Delaware Bay when the detector went off. The exhaust manifold was leaking and filling the cabin with CO. No one rode in the cabin until I got the boat home and had it fixed.
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post #14 of 34 Old 06-25-2011
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rconn, the A4 was built from an industrial low-compression low-rpm engine that was designed to pretty much run reliably "forever" with routine maintenance.

Gasoline is supposed to explode. Most fuels are supposed to explode. The only danger is when you are sloppy with the fuel and it explodes OUTside of the engine.

So you check things over once in a while. Replace fuel hoses every 5 years or so with new alcohol-resistant ones because "real" gasoline is hard to find these days. Make sure everything is clean and tight. And because it has a carburetor and carbs need to be overhauled every 5 years or so also (because of varnish and clogging as well as adjustment) you also overhaul the carb if it hasn't been.

And yes, install a blower designed for use on boats and get real religious about running the blower for 5 minutes before you ever ever start the engine.

The fumes and explosions aren't a real issue, but every year there are thousands of accidents on the highway because people can't bother to put air in their tires, so they overheat and blowout. For THOSE people, an A4 would be a problem.

Moyer Marine is The Ultimate Source for things A4. If the carb has been overhauled and the ignition gets routine care, it should run forever. Of course old spark ignition systems means points, coil, condensor, etc. also are expected to be replaced from time to time, so even if your engine runs perfectly, you might want to get a set of ignition spares and pack them away so they will be on hand when and if you need them.

Diesels don't have these problems, no. But they have their own problems, like a stinky exhaust and problems with fuel contamination and growth. Ask any diesel owner if they've ever heard of someone having a fuel problem, air in the fuel, a diesel stink...Sure, it is harder to make diesel blow up but that's not impossible either. "Fuel air bombs" aka "hypobaric weapons" use diesel fuel because it can explode very very nicely.

Make friends with your A4, it really is a simple system and with routine care will work very nicely.
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post #15 of 34 Old 07-07-2011
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here is a link to a pdf of the owners manual:

Two PDF Files of Interest - Moyer Marine Atomic 4 Community - Home of the Afourians

I also have Don Moyers book, and have found that he and those at his shop incredibly helpful and knowledgeable.

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post #16 of 34 Old 07-07-2011
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Just a note. Moyer is producing NEW engine blocks for the A4.

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
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My last project!
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My boat is sold!
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post #17 of 34 Old 07-19-2011
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I replaced the A4 in my old boat when it stoped running.
the A4 always smelled like gas and used more than a gal of fuel an hour, the used diesel that i installed uses less than a third og a gal.
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post #18 of 34 Old 07-19-2011
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Tommays.. those sheaves would really look nice in alum, SS or chrome LOL

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
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post #19 of 34 Old 07-26-2011
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mariner, ive had a similar problem with my A4 on my 1975 C&C 27. i would be able to get it started and have it run to eternity at idle but after 15-20 minutes after running it at say about half throttle it would start to require a ton of choke. i'm no mechanic either but between the service manual and a friend's father, i figured out the problem. besides needing all new gaskets and a snapped choke shaft, the throttle valve inside the carb was bent to the point where it was flooding out the engine. after having hassles finding the new parts i went with a new carb which was easily ordered, i installed it and tested it out dockside and sure as the sunrise, it hasnt given me a problem yet. its a great engine when its running smooth and believe me i understand the frustration


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post #20 of 34 Old 07-26-2011
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" the throttle valve inside the carb was bent to"
All part and parcel of the reason that carburetted engines just don't belong on boats. A carb is designed to be happy in a fixed, or at least, stable, installation. Bouncy-bouncy does not help the "clockwork" function properly inside a carb.
IMO, the best excuse for a diesel on a boat was that diesels were normally fuel injected while gasoline engines weren't, in past.
Of course the blessings of diesel stink, and high pressure fuel systems, and crud in the fuel tank, mean the old A4s won't be truly obsolete until the last one of them is abducted by aliens.
Carbs, even in cars, should be stripped and overhauled every 5 years or so. Supposedly the "new" gasoline blends will extend that interval but I say that's spinach and I'm not having any of it.
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