mercury carbuerator

weasel

Cadet
Joined
May 3, 2002
Messages
13
I have a 1963 9.8 mercury mariner 110. It started spurting gas out of a small orfice next to the fuel intake, on the top of the carb. What is this about?? Is there supposed to be something in there or is it some type of vent. The crappie are spawning and I need some help please.
 

12Footer

Fleet Admiral
Joined
Mar 25, 2001
Messages
8,217
Re: mercury carbuerator

The problem you describe is a very common one. It happens on most carbs that sit with fuel in them for long periods of time. It's caused by the float needle not going all the way up, and shutting off the flow to the carb once the float is pushing it up. It's caused by the varnish most times.<br />You can get someone to squeeze the primer while you tap (gently) on the bowl with a screwdriver handle...Thump it a few times. If the flow stops, you are probably good to go..If it don't, you must take the carb off, remove the bowl, remove the float by pulling it's hingepin, taking the needle out, clean it and the orafice, and re-assemblin it.<br />Good luck.
 

petryshyn

Commander
Joined
Oct 3, 2001
Messages
2,851
Re: mercury carbuerator

Sounds like its flooding (the needle and seat/float assembly has failed) Disassemble carb and clean all passages. Replace the needle and seat and all removed gaskets.<br /><br />*if you want to try your luck.........<br />>disconnect fuel line<br />>run engine at idle till it just about quits(sputters)<br />>shut engine off<br />>tap on the bottom of carb with a plastic screw driver handle (gently)<br />>reconnect hose and pump the ball vigourously<br /><br />*sometimes this will clear a stuck needle :)
 

12Footer

Fleet Admiral
Joined
Mar 25, 2001
Messages
8,217
Re: mercury carbuerator

Pour me a coke, Schematic (we doubled). :D
 

petryshyn

Commander
Joined
Oct 3, 2001
Messages
2,851
Re: mercury carbuerator

Wow......I think we did it twice today.....<br /><br />I'm going to buy lotto tickets!!! ;)
 

weasel

Cadet
Joined
May 3, 2002
Messages
13
Re: mercury carbuerator

Hey, Thanks alot fella's what a really neat forum and so helpful and knowledgeable. I suspected that it might be a vent hole and maybe the float should close before the gas reached that vent hole. Can I use my old gaskets or where can I get a new set? It's crappie time!!!
 

12Footer

Fleet Admiral
Joined
Mar 25, 2001
Messages
8,217
Re: mercury carbuerator

The trick is to not tear it down any further than needed.<br />Get a can of Valvoline Carb cleaner (the can has this cool wand on it,and can be aimed better than an SKS!)..<br />Get a sheet of gasket material the same thickness as the old carb mounting gasket.<br />Get an exacto knife, and make a new one. Make sure it's acurate,and the small hole on top is in the new one.<br />As long as you only remove the bowl,chances are good you won't need the 35dollar rebuild kit.<br />Use care with the hinge pin and the tab on the float.Do not bend it, or you will play hail getting it set properly later.<br />Do not soak the needle or carb in carbonic carb cleaner,just use spray..The gallon can will clean it so well,the thing will never run again (eats all plastic,rubber,non-metals).<br /><br />While you have the carb out,turn the mixture screw in until it just contacts the seat,while counting the turns. Write that number down,so you can put it back exactly as it was set before you had problems..It will be right on the money.<br /><br />Spray carb cleaner thru every hole in the carb.<br />Be very carefull,as it usually exits where you least expect it,right into yer eyeball.<br />There is a jet in the side of the pickup tube,and you will want to clean it well,even if it looks "open".<br />Good luck.
 
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