Owner 1973 C-41 Sloop
Join Date: Sep 2018
Location: Matthews, NC
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Re: Atomic 4 question
I had one on my Columbia 8.3. U used the vang to control the boom and mainsheet to lift it and swung the boom out over the dock, took it into the shed and rebuilt it, taking the opportunity to re-paint (brush, prime first) the parts in the original copper color. The only thing I did not do was take the valves out of the head. New rings, bearings, main seals, water pump impeller, fuel pump diaphragm, everything but the valves. Very easy rebuild. When I put it back in I put new fuel lined and added a large Racor fuel filter/water separator and added a shutoff valve after the filter. I ran the hose from the original small filter/separator to the Racor, to the cutoff, to the carburetor which I also rebuilt. Then I bought 2 of each ignition parts (2 rotors, 2 distributor caps, 8 plugs and 10 wires, 2 coils, 2 points, 2 condensers) so I could get it back running while at sea. The hardest part of the rebuild was finding the book with all the instructions and specs. At the end of it it ran great until the new but aged cork head gasket failed allowing seawater to enter one of the cylinders. If you can't find a recently manufactured head gasket, I would cut your own from modern synthetic material. I think the total build was under $300 including redundant ignition system parts.
A quick web search and I was able to find a free PDF of the manual I had: (I can't post links, so... "fdlaudubon dot org slash page19 slash assets slash A4RepairMaint dot pdf" or google "atomic 4 service manual" and it was the first result for me.
I would rebuild it. Let us know how it goes! Good luck!