mercury 115/1150 6cyl thunderbolt

[tim 6969]

i want to say thank you for this site/ im a newbee at boat motors . i have 2 or more questions . first i went to the first site to find out what year this motor is and what i came up with is a 85 now i took the numbers to the parts place and he said it was a 75 here is the numbers 7105274 it is a mercury 115/1150 6cyl thunderbolt now / when i got the motor it ran but it was shooting gas out the overflow but ran so so /good. so i got rebilde kits for carbs and flots replaced every thing and cleaned with carb cleaner and put everything back togetther i even got new ball / now i cant get the ball hard and cant get gas to the bows to fill . there is gas going to her carbs cause when i take the gas line off the first carb it shots from the hose if i pump the ball so any help whould be grate thank you tim

 

[Laddies]

Re: mercury 115/1150 6cyl thunderbolt

Your engine is a 1977 Canadian built engine and someone needs to redo the fuel system as you say it ran before.

 

[tim 6969]

Re: mercury 115/1150 6cyl thunderbolt

i want to say thank you for this site/ im a newbee at boat motors . i have 2 or more questions . first i went to the first site to find out what year this motor is and what i came up with is a 85 now i took the numbers to the parts place and he said it was a 75 here is the numbers 7105274 it is a mercury 115/1150 6cyl thunderbolt now / when i got the motor it ran but it was shooting gas out the overflow but ran so so /good. so i got rebilde kits for carbs and flots replaced every thing and cleaned with carb cleaner and put everything back togetther i even got new ball / now i cant get the ball hard and cant get gas to the bows to fill . there is gas going to her carbs cause when i take the gas line off the first carb it shots from the hose if i pump the ball so any help whould be grate thank you tim

i have rebilt the carbs / done all the hoses / made sure i was getting gas to the no 1 carb what else is there . i know how to rebild carbs i do it to snowmobiles and cars all the time thank you tim any thing els?

 

[Fuzzytbay]

Re: mercury 115/1150 6cyl thunderbolt

It might not hurt to rebuild the fuel pumps too. There as important as the carbs, if not more so. If there is back bleeding, the motor will perform....so so.

 

[Yepblaze]

Re: mercury 115/1150 6cyl thunderbolt

Let's see, if the bulb won't go hard what could it be...

no fuel to bulb

reversed bulb

bad bulb including it's internal check valves

leak in engine fuel system

pump

lines

carbs

.....

 

[tim 6969]

Re: mercury 115/1150 6cyl thunderbolt

i have rebilt the carbs / done all the hoses / made sure i was getting gas to the no 1 carb what else is there . i know how to rebild carbs i do it to snowmobiles and cars all the time thank you tim any thing els?

well im checking the fuel pump to day and well see . there is nothing diff from 2 days ago the fuel pump was working then any way ill try anything can happen i gess thank you tim

 

[sho3boater]

Re: mercury 115/1150 6cyl thunderbolt

If it will not get hard but is pumping, then likely the bulb is bad or the fuel is going someplace....or you are pumping it really hard. Take the plug out of a carb bowl and see if it has fuel, if it pumps out. Usually have to choke these hard with the idle all the way up to get them to fire up. They start harder if tilted up, when cold.

If you take a line off a carb and spin the starter it should pump out if pump on motor is working. Don't start a fire! That pump is pretty cheap/easy to rebuild. Note if your bulb goes bad it can fill the pump with rubber bits.

 

[tim 6969]

Re: mercury 115/1150 6cyl thunderbolt

well im checking the fuel pump to day and well see . there is nothing diff from 2 days ago the fuel pump was working then any way ill try anything can happen i gess thank you tim

well i did not get out there today but your telling me that a brand new balb is going to be bad when i checked it be for i put it on the boat . i am going to check the pump and see i had more problems now im not getting spark . i throw my arms up thank you for the reply and help anything else whould be grate thank you tim

 

[Fuzzytbay]

Re: mercury 115/1150 6cyl thunderbolt

We can only offer advice, mercs really require top fuel performence, if something is wrong, then they don't run right. IF the fuel system is perfect, then, then why is the gas flowing out the carbs, and the ball won't get hard?
If the fuel pump is fine, then revist the carb rebuild, are the floats set right? There is something amis somewhere. On my 1961 merc 800, the bulb gets so hard, I almost have to use two hands to squeeze fuel out of the carbs. By squeezing that hard I can push fuel out, but once my ball is hard, it stays that way too. No bleed down either.

 

[Laddies]

Re: mercury 115/1150 6cyl thunderbolt

FB, everthing is perfect except for gas squirting out and it won't run.

 

[sho3boater]

Re: mercury 115/1150 6cyl thunderbolt

That is the way these old inline Mercs are, if you squeeze the bulb really hard the carb float will overflow into the carb. If you just rebuilt them you might not be able to make them do it. If they are not working right the fuel will come out easily. Most people force the bulb like that for a cold start because the choke does not work that well being only on 4 cylinders. It works like a primer if you force it and starts faster, of course you need to trim the motor down so the gas runs into the motor not out of the carb. I could not get mine to do it after I went through the carbs and never ran it before that.

I would take the floats back out and reset/inspect them, check the filters, etc.

 

[A164A]

Re: mercury 115/1150 6cyl thunderbolt

I have an mercury 115hp from 1984, (brown label), I rebuilt the intire motor over the winter, removed the idel-stabiliser (due to faulty fungtion), added ower size main jets in carburator (0,082), retarded the WOT ignition point with 1-2 dg. and got my motor runnig fine and fitting todays fuel.
Standard setup DO NOT WORK.