For the BEST Atomic-4 info interchange go to www.moyermarine.com
and pose your questions there on the 'forum'.
This website is run by the world's "guru" of Atomic-4 engines.
Evaluate the engine
of internal corrosion
, pressure check the exhaust
manifold and exhaust
system for pin-hole water leaks
. Descale the raw water cooling
circuit to remove accumulated 'carbonates' using a commercial
boiler descaler such as Marsolve or Rydlyme (dont use acids such as muriatic, etc.)
The 'usual' end of an Atomic-4s life is when the block corrodes through. A simple 'test' for corrosion
progression is to remove the exhaust manifold and attachment bolts; probe into the bolt holes and count the number of 'threads' remaining - if greater than 4 threads - you have 'some' life left (enough to do a complete 'rebuild' if necessary).
Suggest that you purchase
Don Moyers "Service and Overhaul
Manual Atomic-4" (www.moyermarine.com
) and check out the engine yourself ... or lend the manual to a competent mechanic
(most 'good' mechanics have long forgotten the idiosyncracies of the atomic-4).
If the engine checks out to be a 'sound' engine, suggest that you consider those 'modernization' upgrades that will vastly prolong the service
life: freshwater cooling
(heat exchanger, electronic ignition, electronic fuel pump
, thermostat upgrade, lube oil
filtration, PCV, etc. etc. .... all relatively inexpensive and will save you $$$$$ later on.
If the engine evaluation shows that 'its ready to go over to the dark side' a full precision rebuild
will cost you ~US$4000 plus installation
.... a LOT cheaper than a diesel replacement or even a large outboard. DoItYourself A4 for A4 change out is easy if you have a modicum of mechanical ability.
Start with the moyermarine website .....
NOTHING is as smooth running as an Atomic-4
hope this helps. Have a good trip.