Submerged OB, pulled back out, now what?

aeronutt29

Petty Officer 2nd Class
Joined
May 28, 2002
Messages
112
Perhaps this should go in the "stupid tricks" section but......<br /><br />My boat (15' tri-hull, '69 100HP Merc) sank in 5 feet of water (don't ask :mad: ). The outboard was submerged completely for about an hour before we managed to drag the boat up onto the shore. While the boat was under water, the motor was cocked up in the transport position so the carburetors were pointed down. I pulled all the spark plugs and found no water in any cylinders. The distributor cap was full of water so a good wiping out and spray down with WD-40 was in order. Looking into the carburetors showed no sand or plant matter so I didn't remove the carburetors. The motor fired right up in my driveway and ran just fine for about 20 minutes. I did notice that the idle speed was a little lower than usual, but I though that might just be caused by moving the idle screw when I took the distributor apart. I put the boat in the water and tried full power. The response was significantly less than I am used to. The boat only made it up to 18 MPH. 32-35 is normal. When I pulled the cover and held my hand in front of each carburetor, I noticed the bottom carburetor was spitting gas out onto my hand. This makes me suspect that something (seaweed?) might be holding the reed valves open and allowing the air pulse to shoot back out. <br /><br />Anybody have a good suggestion for the best way to handle this? Should I replace the reed valves just for good measure? Would this be a good time to buy my first bottle of Power Tune?
 

alcan

Commander
Joined
Dec 14, 2001
Messages
2,505
Re: Submerged OB, pulled back out, now what?

Hi aeronutt<br />These things happen. Can I assume that since you are from Nebraska that your engine sank in fresh water? I would clean and dry all electral componets. remove and clean the carbs. You can look in the intake manifolds and veiw the reeds. You will need a penlite and look both up and down in each hole. To replace the reeds in that Merc you would have to open the crank case. Might as well rebuild it if your going to do that. I wouldn't in this case, I don't think it's necessary. Since you have already started and ran the motor, I think just a good going over and tune up, and she will be fine. The power tune type products are for removal of carbon build-up. You just got done steam cleaning the inside of your engine so I feel it would of little value.
 
D

DJ

Guest
Re: Submerged OB, pulled back out, now what?

aeronut,<br /><br />Before you go pulling the carbs. and reeds apart, make sure you have spark on all six.
 
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