old merc 115hp 6cyl tower of power

[LukeJustLuke]

ok some I'm having a few minor problems with my engine.
Does anyone know where I can get or find a manual for this engine.
I believe its around an 1984 engine.....it goes well,when she goes.

My problem is the bottom carb pisses out fuel I need to adjust it....

And now I'm stuck I don't have much knowledge I'm new to this perfomance boat stuff

It starts and then would stall and when put in gear it stalls.

Any help greatly apprichated.

[Andy B]

how long has this engine been stood before you got it?
sounds like a good place to start would be to take the carbs off and give them a good strip and clean.
the flooding is probably caused by an obstrution in the inlet needle causing the float chamber to not shut off when full

[grandmas denture]

Originally Posted by Andy B

how long has this engine been stood before you got it?
sounds like a good place to start would be to take the carbs off and give them a good strip and clean.
the flooding is probably caused by an obstrution in the inlet needle causing the float chamber to not shut off when full

... thats it
... got 3 or 4 complete straight6 hp115 engines for spares, the oldest is a 1350 from 1971 with distributor, the newest a 115 from 1989, let me know if something is needed

[LukeJustLuke]

Aghhh thanks so much for the help guys.
I ahve now worked out thats exactly what I need to do.

And if I need any spares I know where to come

I will keep you up to date on how it goes.

[LukeJustLuke]

Originally Posted by Andy B

how long has this engine been stood before you got it?
sounds like a good place to start would be to take the carbs off and give them a good strip and clean.
the flooding is probably caused by an obstrution in the inlet needle causing the float chamber to not shut off when full

Andy its been stood for well over 9 months, I hopefully get all the carbs cleaned out and she be tickety boom.

Also....Im loving Hatchet Pond as a cruising area!

[the edge]

Hatchett pond !! you will be popular

[LukeJustLuke]

Sooo after a long process I got the carbs cleaned and she seems to run fine in tick over but I can't seem to slove the problem of...

Going into gear.
So I sit there and shes fine click into gear and blluurrpp dead nothing!

Any ideas?

[LukeJustLuke]

Sooo after a long process I got the carbs cleaned and she seems to run fine in tick over but I can't seem to slove the problem of...

Going into gear....heres what happens

So I sit there and shes fine in tick over, pumps water sounds good.... click into gear and blluurrpp dead nothing stalls!

To give you an idea outof the water on mufflers its fine it goes in/out of gear not a problem at all but as soon as she gets wet and click into gear it stalls.....this is starting to confuse me ALOT!

Any ideas?

Thanks Guys

(I ran out of edit time)

[Andy B]

Could be many things!
Air leak, carb ballance, low fuel pressure, weak mixture and totally of the wall is you gearbox free? Dose the prop spin while your running on muffs?
Is the engine stalling through lack of power or is it mechanical.
Another possibility is head gasket, but don’t get carried away!
start by checking all the simple stuff first,
Air leaks around the carbs and inlet manifold can be checked by spraying WD40 around them while the engine is running, the engine will pick up momentarily, check the diaphragm in the fuel pump. Reset the mixture screws,
Its all fun stuff and you get to do it six times!


the best advice i can give you as someone who wants to learn is get it serviced by someone who knows what they are doing and then once its up together learn to keep it that way!

otherwise with that motor there is a chance you'll go mad

[LukeJustLuke]

hi andy......it spins fine on the muffs and to me it sounds as iff its lacking fuel or air in the system.
I was told to make the mix 400ml oil to 20liters of fuel.

So slowly getting round to narrowing it down.
What do you think?

[Andy B]

Originally Posted by LukeJustLuke

I was told to make the mix 400ml oil to 20liters of fuel.

So slowly getting round to narrowing it down.
What do you think?

thats 50to1,
these old engines will burn that if they are running well but you could be oiling up on tick over, what do your plugs look like?

[LukeJustLuke]

Originally Posted by Andy B

thats 50to1,
these old engines will burn that if they are running well but you could be oiling up on tick over, what do your plugs look like?

Andy the plugs are clean as...... no problem there.......

[S2art]

I raced a 115 straight six, I once had that very same problem with it, as you say runs fine until you put it into gear. On mine it turned out to be the powerhead to leg gasket was leaking. Replaced it and it ran fine. Good luck getting yours sorted.