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Bleed hole lower unit ?? 1998 Johnson 115

B

Balder

Contributing Member
Hello, i rebuild the waterpump on my 1998 Johnson 115hp this week, i ran the motor at idle with muffler today, there came water from a little hole on the right side of the lower unit (a few cm over the water intake where the muffler sits), is this normal ? i had not water from this hole with the old waterpump when idle on garden hose.
I think this is normal but hope you can say...this is normal:)
PS, sorry, my english is not the best but hope you understand what i trying to say.
 
Yeah... normal. A drain hole that was apparently clogged before you installed the new pump.

That's not a muffler (device to quiet exhaust on autos).... it's a Flushette. On high hp engines, have the water turned on full blast.
 
joereeves said:
Yeah... normal. A drain hole that was apparently clogged before you installed the new pump.That's not a muffler (device to quiet exhaust on autos).... it's a Flushette. On high hp engines, have the water turned on full blast.
Click to expand...
Thanks alot to you, now i can sleep well tonight :))
 
One more question, i have this engine on a 19" boat, i reatch 5000rpm/32knop, i would like 5500rpm...i think this would give me a little more speed ? how muth should i try to go down in pitch ? or wiĺl it not work, is 5000rpm good vot for this engine?
PS...someone on this forum told me this motor must have all ! the thin oilhoses in place if i not used the oiltank, i got the motor fully overhauled with boring/new piston/full package, i removed all !! oilhoses and plugged them all, i use 1.2% oil and the motor run perfect, like a new engine, i have 200 hours on it now, it is NO problem to run this engine without all the "100" hoses, it run better and smother without them.
So not be afraid to clean up all the hoses and burn them.
 
Those hoses should be installed !-----They are part of an oil recirculation system.-----That is not to be confused with OIL INJECTION that mixed oil with the gasoline.------You need to step back and reinstall those hoses.----You need to run this motor at a 2% ratio.----But it is your motor so do what you THINK is correct for it.
 
I have 2 summers and 200 hours on it now and it run 100% perfect, so i will not go back to all this hoses, it was almost imposseble to see the engine for all hoses, now it is a clean and simple engine to work on and very nice and clean to lock at.
I have build 2stroke race engines for 25 years so i know a little abot how things work, but have not work mutch on outboards, but this old engine is just a ordernary 2stroke, it has pinbearings and this engines runs cold compared to many other 2strokes so i am not afraid for the oil ratio.
If there was a problem it would brake down quickly....all yamaha here run 1% oil, dealers reprog e-tec to 1% oil here and give same warrenty.
Yes it is my motor and i will not change it, runs safe and good.
Check the head temp/cooling now and then with a infrared temp so you know the waterpump and the thermostat is in good condition and the motor will survive.
If a engine brake down it is mostly a big failure, overheat/broke thermostat, NO oil, to big piston cyl clerance/very high hours, bad sealings/water inside the engine and things like that.
Some persons have always engine problems and other run their motor year after year without any problems...they are like a wife..give them good care and they will not let you down :)
Cooling/lubrication and clerance, when this 3 main things are under controll the engine will have s good life.
But with all respect !! all must do what they think is the best for their engine....but this is what i did with mine.
I am very thankfull for answer from you when i need help, i got help with my first question, thanks to you!
Not very many here that do outboard work themself, we use the dealers for big jobs.
I bought this engine with a bad piston, there was water in the oil tank and then the winter came...no oil to the engine.
I rebuild it because it still looks like a new motor.
 
Balder.... Unfortunately I"m not a prop man, and I have no idea what changes would be needed to gain those extra rpms. You would need to know exactly what year and hp that engine is so as not to exceed the recommended rpm which will really tear a engine up. Case in point.......

I built a V6 crossflow for a very close friend many years ago. After a few weeks use he brought it back to me and the flywheel was literately torn to pieces. I didn't think it possible but it was like some space monster was tearing it apart. Anyhow I took him at his word that he wasn't doing anything weird and installed a new flywheel for him ($$$$).

A couple days later, having a general conversation with him and a couple beers, he let slip that on his boat, changing props, he could get that thing up to 7200 rpm. That engine is rated tops 5500 rpm. I let him know just exactly what would happen to a flywheel at that rpm... and what a new flywheel cost. Have you ever seen a human being explode with hundreds of four letter words... new ones being invented/discovered on the spot? My friends nonchalant attitude while opening another beer turned me into that case of explosives within a microsecond. I don't remember him leaving, it was like he rather just disappeared. That was back around 1989 or so.... haven't seen him since. bottom line... stick to the recommended rpm ratings.

Those hoses, if you're speaking of the ones I visualize, are fuel recirculating lines, engineered for economy.

If fuel is being forced thru a one way check valve at the intake manifold (say from #1 cylinder) into a hose that leads to #3 cylinder, and it becomes clogged at the valve... #1 cylinder ends up running rich... #3 cylinder runs lean. That's what happens if just one valve, hose, fitting is plugged.

Now, with every one of those valves, fittings plugged as you describe... I've been running thru my head just exactly what would happen in a certain amount of time... and since you've put 200 hours on the engine with no complaints, what would happen is "Nothing?". Perhaps the lean/rich problem is compensated by a change of some kind with the carburetors, or perhaps what happens is that the excess fuel gathering is simply dumped overboard as per older models? After doodling, wearing out three pencils, obtaining one hellava headache, and becoming completely confused.......

I said the hell with it! Maybe the guy's onto something! :rolleyes: Go for it.
 
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