Overheating/white milky fluid.

[fortyfreak9]

I was at the lake over the weekend and me and my friends decided to cruise around the lake for a bit, we probably ran my 110 Johnson at wot for 45+mins, I took a few sharp corners and it seemed to bog down then get back up to speed, as I was coming in to park it, it didnt wana run very well, Iwould give it alittle throttle and it would bog, so i used my electric trolling motor to ge tto shore. I opened the hood and the motor was very hot to the touch. And on the two carbs was this white milky looking fluid, it kind of had a gas smell to it but wasnt to sure. It was not there before I left because I cleaned it all up before I left. Later that day we boated back to the launch and left without an problems, what could have happened?

 

[HighTrim]

Re: Overheating/white milky fluid.

First of all, I have to ask, why in the world would you run your outboard at WOT for that long? Would you drive your car uphill at redline for 45 mins?

What year/model are we talking about here?

 

[fortyfreak9]

Re: Overheating/white milky fluid.

I guess I didn't know any better. But thanks for asking I appreciate it. 1989 Johnson 110.

 

[R.Johnson]

Re: Overheating/white milky fluid.

In proper tune, and set-up, that engine will run as long as you wish at full throttle.

 

[fortyfreak9]

Re: Overheating/white milky fluid.

It was still running strong, just looked like water somehow got in the carb and around the motor, I dont have any clue what the white-ish fluid was, ever seen/heard of this?

 

[HighTrim]

Re: Overheating/white milky fluid.

I would compression test it before running again. I wont scare you on what may have happened until you do.

Everyone is entitled to their own opinion, but personally, I would not run an outboard or inboard at WOT for that long. Due to the backpressure on the exhaust, and the fact that outboards do not have transmission per se as autos do, it is comparable to running a car up hill at redline. Give her the throttle, get the boat on plane, trim, then back of to 3/4 throttle. You will save fuel and the life of the motor. But as I said, that is just my own humble opinion. I do not have the experience of R.Johnson, I would just not offer that assumption online to a boater that I do not know driving a boat/motor that I am unfamiliar with.

 

[SnappingTurtle]

Re: Overheating/white milky fluid.

First of all, I have to ask, why in the world would you run your outboard at WOT for that long? Would you drive your car uphill at redline for 45 mins?

Yes. I run my car at "redline" on the German Autobahn for hours at a time, and have been doing so in it for over thirteen years. Just have to watch the temp and run a quality synthetic oil.

I also just spent yesterday running my small 6hp Evinrude WOT for over four hours on the river here. It is a 1981 model.

Lugging a motor, is worse than running a motor, IMHO.

 

[ezeke]

Re: Overheating/white milky fluid.

Do you have a water separating fuel filter? If so you may have picked up the water in it on your turns; gasoline and oil both float on water. This can occur with water in the tank as well.

There have been many cases of air entering fuel system on tight turns when the fuel tanks are low on fuel. The unusually high power is caused by the lean condition just before the rod goes through the block.

 

[Randyg123]

Re: Overheating/white milky fluid.

... I took a few sharp corners and it seemed to bog down then get back up to speed, ....

I assumed that meant he started cavitating in the turn and it took a while for the prop to get its bite back. Maybe I misunderstood. Did you mean the engine was acting like it was struggling to get high rpm or did you mean the boat was struggling to get momentum even though the rpms were still high?

 

[R.Johnson]

Re: Overheating/white milky fluid.

On a warm, humid day, a lot of condensation will form on the carbs', and airbox. There is always some oil-fuel blow-back around the carbs'. I have seen this form together before.Depending on the engine, they can have a full throttle operating range as high as 6000 RPM. That does not have the same meaning as red line. Lugging a engine, such as improper set-up, or using the wrong prop will not let a engine get up into it's power band. That is hard on an engine at any throttle setting.

 

[fortyfreak9]

Re: Overheating/white milky fluid.

I would go into the turn and it would bog down, but then regain its power when the boat would straighten out. I was pretty low on fuel in the tank I was using, could you explain what you meant ezeke.

The fluid was only on and around the carb and air intake, the boat runs at about 5800 rpm's at wot. I drove it later that day at low speeds and it sounded good but did not go wot.

 

[SnappingTurtle]

Re: Overheating/white milky fluid.

... I was pretty low on fuel in the tank I was using, could you explain what you meant ezeke ...

In race cars the fuel cells are often chambered or filled with a foam like material to prevent sloshing in turns and feeding air to the carbs instead of fuel.

With a partially empty tank this becomes more of a problem in hard turns, than with a full tank.

If you were running with a low tank, your full line can pull in air instead of gas for short time periods, causing the motor to run lean. This is not a situation you want your motor to run at, especially if it is a two stroke, because the fuel in older motors also carries the lubrication. So it not only runs lean, it does so with out lubrication.

This could lead to the problem ezeke described when he said you might end up throwing a rod. At least I think this is what he was saying.

 

[ezeke]

Re: Overheating/white milky fluid.

I'm sure that SnappingTurtle knows that is exactly what I meant.

 

[Benny1963]

Re: Overheating/white milky fluid.

well these guys on here are good ,but you also said the motor was to hot to touch ,pull all your plugs ,check fpr overly claen plugs .run a comp check .
drain your carb bowls ,check for water in your tank .pull down carbs ,
check your waterpump imp or just make sure its pumping good .
repost .and maybe some fresh gas check all fuel lines at motor change water fuel sep if ya have one , but i would pull plugs and comp check before i spent any money on carb kits filter and soforth .may also need to check thermos
45 min is a long time wot but ihave run 20 gals out of mine on missippi river
at 5500 with good water pressure it should cool and burn some of the carbon out from trollin,

 

[iwombat]

Re: Overheating/white milky fluid.

Running at WOT doesn't compare to running redline at all. It does compare nicely to running your car in the highest gear at full throttle on a slight uphill grade. Doing so, your gearing is going to determine how close to redline you're going to get, much like prop size is going to determine how close to redline you get in your outboard. 6000rpm is probably not even close to theoretical redline on a two-stroke outboard.

I've run out to the fishing grounds for 1+hours at WOT in calm weather plenty of times. It shouldn't be a problem with a properly propped motor at all.

 

[ezeke]

Re: Overheating/white milky fluid.

I'm with Iwombat on this one. My big reservation is not being over-propped and lugging the engine.

I could hit 6700 RPM, (the rev limit) on my 140 looper if I wanted to, so running 5000 for an hour does not concern me at all.

That did not bother me on my old 1976 115 crossflow either, I just used 5800 RPM as the threshhold like Dhadley said to do.

 

[HighTrim]

Re: Overheating/white milky fluid.

Guess I have been operating inboards much too long now, or am much too conservative, and am use to keeping the cruising speed at around 3k RPM. I humbly retreat to my shell.

Rev away boys

I never meant to imply in any way that under revving or lugging the motor was preferrable, so am sorry if if came across that way.

Either way, I would still back off to 3/4 throttle while underway, regarding fuel consumption if nothing else. I would also still give her a compression test, but that is just me.

 

[fortyfreak9]

Re: Overheating/white milky fluid.

I was really just worried about the white fluid on the carb, it was 105 degrees out and the water wasnt ice cold so i can see how it would run hot, but have no clue about the fluid i saw.

 

[ezeke]

Re: Overheating/white milky fluid.

"White milky fluid" is usually the way agitated oil with water in it is described.

 

[Randyg123]

Re: Overheating/white milky fluid.

Sorry your thread kind of went off of a tangent and strayed away from helping you solve your problem.

First of all, the motor should not be "very hot to the touch" as you described and that serious issue must be addressed as Benny1963 advised.

Second was the white milky fluid issue that is probably fuel/water mixed together as ezeke said. Reading the thread I am not sure if your question as to 'what may have caused this and is this a problem?' was answered (I guess I'm curious to find out too) so I thought I should bump this back up.