Carb rebuild help!

[parrisw]

Ok, finally getting into my carbs on my 1984 Johnson 115, due to the lower two cylinders getting too much fuel/flooding, I couldn't find anything wrong with the pump diaphragm, so I figured its the bottom carb, so far I've just taken apart the lower carb and found nothing wrong, the needle and seat seal fine, when the carb is upside down, I couldn't blow through it, the float level looks fine, its level with the body, do these floats go bad? Ive done lots of these type of fiber floats in auto carbs do to getting saturated with fuel and become too heavy, then they sink and don't float up properly and shut off the needle and seat.

Thanks for any help.

Will

 

[marinemech1]

Re: Carb rebuild help!

I've never had a bad OMC\BRP float but anything is possible
Make sure main jets are clean and tight.
I assume you've checked spark?
Wayne

 

[parrisw]

Re: Carb rebuild help!

I've never had a bad OMC\BRP float but anything is possible
Make sure main jets are clean and tight.
I assume you've checked spark?
Wayne

Ya, it always seemed to run fine. But when I checked compression I saw fuel flying out of #4 cylinder, if I dry off the plugs and crank it over for 10s then pull all the plugs the bottom two are wet, top are dry. Jets seem to be clear, I sprayed intake cleaner through them and they all flowed out fine. I don't have a tool to check to see if they are tight.

 

[marinemech1]

Re: Carb rebuild help!

Fuel pump (vro) is fed from #4 could be a diaphram leaking
did you check spark?
Wayne

 

[parrisw]

Re: Carb rebuild help!

i dont think it is diaphragm, i just went through that, both bottom plugs are getting wet. no didnt check spark.

 

[marinemech1]

Re: Carb rebuild help!

Check spark
assuming plugs are wet with fuel not water?
What spark plugs and are you using good oil?
Wayne

 

[parrisw]

Re: Carb rebuild help!

Check spark
assuming plugs are wet with fuel not water?
What spark plugs and are you using good oil?
Wayne

Why would spark be in the picture? with plugs out, cranking fuel should not spray out of the plug hole? Plugs are NGK, using BRP oil, XD 30. No not water.

 

[marinemech1]

Re: Carb rebuild help!

hard to picture how much fuel coming out
a small mist is sort of normal a flood of raw fuel is not
assuming you can start and run motor? pull wires off cylinders 3 and 4...are they running?
also look at lower carb for signs of flooding?
it still kinda seems like a pump diaphragm but let me know what cylinder balance test shows


champion plugs are much more preferred
Wayne
p.s. will look again tonight

 

[parrisw]

Re: Carb rebuild help!

hard to picture how much fuel coming out
a small mist is sort of normal a flood of raw fuel is not
assuming you can start and run motor? pull wires off cylinders 3 and 4...are they running?
also look at lower carb for signs of flooding?
it still kinda seems like a pump diaphragm but let me know what cylinder balance test shows


champion plugs are much more preferred
Wayne
p.s. will look again tonight

Hey, maybe I'm off base, I just thought it was too much fuel. I did pull the wires and it was firing on the cylinders. I cranked it over with a piece of white paper in front of the plug hole and it made a splatter pattern, on it, wasn't raw fuel though. I checked the pump as per instructions from a local mechanic, he said disconnect the fuel pump pulse line, and pump the fuel bulb as hard as I could so it would build pressure, well, I pumped that thing real hard, and no fuel came out of the pulse line from the pump, if the diaphragm was leaking, you'd think it would come out then with allot of pressure on it like that.

Cant start engine now, bottom carb is off and apart, if anything, I'll know the carbs are done.

Many thanks

Will

 

[marinemech1]

Re: Carb rebuild help!

with motor running and dead cylinder 4 pinch off pulse line (one that goes too block) and see if motor picks up cylinder 4
Wayne

 

[parrisw]

Re: Carb rebuild help!

with motor running and dead cylinder 4 pinch off pulse line (one that goes too block) and see if motor picks up cylinder 4
Wayne

Not sure I follow ya. Run motor, and what do you mean by dead cyl 4? Take off plug wire? Then pinch the pulse line?

 

[marinemech1]

Re: Carb rebuild help!

you got ahead of me... by the sounds of were you are now...reassemble motor and start up, check for:flooding lower carb and do a cylinder balance check by removing one wire at a time from plugs (use insulated pliers) you should hear\see spark and cylinder should drop off if not see why cylinder is not running.
Wayne

 

[mikesea]

Re: Carb rebuild help!

How about your primer is leaking thru for some reason

 

[parrisw]

Re: Carb rebuild help!

you got ahead of me... by the sounds of were you are now...reassemble motor and start up, check for:flooding lower carb and do a cylinder balance check by removing one wire at a time from plugs (use insulated pliers) you should hear\see spark and cylinder should drop off if not see why cylinder is not running.
Wayne

Ok, I'll do that when I get it back together.

 

[parrisw]

Re: Carb rebuild help!

How about your primer is leaking thru for some reason

Yes, I was thinking this, this morning, but wouldn't it leak through both primers, the solenoid opens and feeds both primers doesn't it?

 

[parrisw]

Re: Carb rebuild help!

you got ahead of me... by the sounds of were you are now...reassemble motor and start up, check for:flooding lower carb and do a cylinder balance check by removing one wire at a time from plugs (use insulated pliers) you should hear\see spark and cylinder should drop off if not see why cylinder is not running.
Wayne

Ok, back together and ran it today, ran good, pulled each plug wire, they all dropped off about the same, so I'd say its good there.

But I found another problem!!!!!! Dam this motor!!

See here please! http://forums.iboats.com/showthread.php?p=2626507#post2626507