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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Gas > Atomic 4 > Atomic4 Blues
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Thread: Atomic4 Blues Reply to Thread
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Topic Review (Newest First)
02-17-2013 05:54 PM
SirRedemption
Re: Atomic4 Blues

Quote:
Originally Posted by marianclaire View Post
Sorry I should have asked. Is your distributor set up for electronic ignition or is it points? Look forward to your posts on the Moyer site. Dan S/V Marian Claire
havnt pulled the cap but I am pretty sure its points
02-17-2013 05:28 PM
marianclaire
Re: Atomic4 Blues

Sorry I should have asked. Is your distributor set up for electronic ignition or is it points? Look forward to your posts on the Moyer site. Dan S/V Marian Claire
02-17-2013 05:03 PM
SirRedemption
Re: Atomic4 Blues

Quote:
Originally Posted by downeast450 View Post
Could your exhaust be partially blocked? Can you check back pressure?

water pressure at the exhaust is good and the exhaust is only a couple years old

Quote:
Originally Posted by CalebD View Post
My boat is from 1967. It is more about how long the fuel tank has been allowed to wallow with E10 gasoline in it though. It is the ethanol that phase separates from the fuel over time which picks up moisture and then bacteria (crud) grows in it. This stuff floats on the bottom of your tank so you wont know it is there until you go out on a bouncy day and find that your engine is not feeling so well.
I bought a hand pump that I used to pump about 10 gallons out of the tank.
Beckson Siphon Mate Specialty Transfer Pump
If you don't know when your tank was last tended to it is probably time to find out.

mine is a 1968 and I am almost positive the tank has never been dredged. What did you use to pump the fuel out?
02-17-2013 04:45 PM
CalebD
Re: Atomic4 Blues

Quote:
Originally Posted by SirRedemption View Post

oh man that is some disgusting stuff.... makes me want to dredge my tank immediately. What year boat did that come out of?
My boat is from 1967. It is more about how long the fuel tank has been allowed to wallow with E10 gasoline in it though. It is the ethanol that phase separates from the fuel over time which picks up moisture and then bacteria (crud) grows in it. This stuff floats on the bottom of your tank so you wont know it is there until you go out on a bouncy day and find that your engine is not feeling so well.
I bought a hand pump that I used to pump about 10 gallons out of the tank.
Beckson Siphon Mate Specialty Transfer Pump
If you don't know when your tank was last tended to it is probably time to find out.
02-17-2013 04:17 PM
downeast450
Re: Atomic4 Blues

Could your exhaust be partially blocked? Can you check back pressure?

Down
02-17-2013 03:52 PM
SirRedemption
Re: Atomic4 Blues

Quote:
Originally Posted by Lake Superior Sailor View Post
I would replace the coil...Dale
My thoughts too

Quote:
Originally Posted by marianclaire View Post
My first thought is failing coil. Do you have EI? Does the engine die slowly, sputtering or instantly as if you turned off the key? You may want to also post on the Moyer site Moyer Marine Atomic 4 Engine Rebuilding and Parts and you will get a bunch of advice and it is focused on the A-4. Dan S/V Marian Claire
No the ignition is coil distributor. Its hard to say because each actual instance was during my trying to get somewhere but it does seem like a slow spudder (such as with vapor lock) and then a sudden stop. I know an overheating coil can do this (at the time I didnt have a ballast resistor)

I read the same link last night about the signs of sudden stops. it leaves me feeling like I need a new coil and a tank and carb clean out.


Quote:
Originally Posted by CalebD View Post
Second the recommendation to post this over at the Moyer forums.
Poor performance of your A4 can also be the result of bad fuel in your tank. As water and crud separate out from the fuel it floats BELOW the gasoline so you would not be able to smell anything but gas.
In a case like this draining the carburetor main passage plug helped get the crud out of the carb. If you catch the fuel in a container you would be able to see if there is any crud floating underneath the fuel.
It got so bad in my case that I had to pump out the entire tank. The pic below is of the last bit of liquid that came out.
oh man that is some disgusting stuff.... makes me want to dredge my tank immediately. What year boat did that come out of?
02-17-2013 03:43 PM
SirRedemption
Re: Atomic4 Blues

Quote:
Originally Posted by BubbleheadMd View Post
I advise you to take this to the Moyer marine forum. They'll get it sorted out.
The mods just approved my account there this morning =)
02-17-2013 02:55 PM
CalebD
Re: Atomic4 Blues

Second the recommendation to post this over at the Moyer forums.
Poor performance of your A4 can also be the result of bad fuel in your tank. As water and crud separate out from the fuel it floats BELOW the gasoline so you would not be able to smell anything but gas.
In a case like this draining the carburetor main passage plug helped get the crud out of the carb. If you catch the fuel in a container you would be able to see if there is any crud floating underneath the fuel.
It got so bad in my case that I had to pump out the entire tank. The pic below is of the last bit of liquid that came out.
02-17-2013 11:58 AM
Lake Superior Sailor
Re: Atomic4 Blues

I would replace the coil...Dale
02-17-2013 10:15 AM
BubbleheadMd I advise you to take this to the Moyer marine forum. They'll get it sorted out.
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