Oily Discharge - Johnson 9.9

[Putzaroni1]

I did some digging on this forum and see a bunch of different issues similar to this but I took pictures to make it very clear.
When I run this motor in a garbage can I get the following discharge (see pictures).

It seems a bit much to be normal. I greased the prop shaft when I serviced the leg so I was wondering if it might be that or if it's unburnt oil from the 50:1 premix (which I probably made a bit more like 45:1) or leaking gear oil ?

 

[boobie]

Re: Oily Discharge - Johnson 9.9

What does it look like when you run it in the lake ?? A barrel will do that. Mainly unburned oil.

 

[OptsyEagle]

Re: Oily Discharge - Johnson 9.9

2 strokes never burn 100% of the fuel and they combust even worse when run in a barrel without a load. Since the only place for the discharge to go is in the barrel it is going to make a little mess. It all looks normal to me.

 

[rothfm]

Re: Oily Discharge - Johnson 9.9

Agreed,

Normal stuff, no worries. After a barrel run, I wipe the leg down with a little cleaner/degreaser.

 

[Putzaroni1]

Re: Oily Discharge - Johnson 9.9

Thank you guys. I thought this was excessive but it still hasn't been out for a good run since before winter so maybe getting it on a lake will help it to burn some of this off as well.

 

[racerone]

Re: Oily Discharge - Johnson 9.9

If you use some diswasher detergent in your tank you would not see that stuff.---------And if you do not see iit you would not worry.

 

[79Jimmy]

Re: Oily Discharge - Johnson 9.9

I agree that its normal but it looks like its running down the leg as well as exiting the prop. My 150 was the same. The powerhead to adapter gasket is compromised.

 

[the machinist]

Re: Oily Discharge - Johnson 9.9

However that oil running down the pivot housing in the photo seems that the upper motor mount bellows may be cracked & some unburned oil is blowing by there instead of coming out the prop exhaust.

 

[Putzaroni1]

Re: Oily Discharge - Johnson 9.9

I there anything that can be done to stop this or is it OK to leave it as is ? It's running so well now I'd like to do what I can to insure it's as close to 100% as possible.

 

[the machinist]

Re: Oily Discharge - Johnson 9.9

As I mentioned above, that oil coming down the pivot shaft is not normal. If just the rubber seal/bellows is bad, run it as is. However when that bellows goes bad it is usually because the upper motor mount is broken also. With the motor on the transom as if in the running position, grab the motor's powerhead & see if you can get any movement forward/back. It should not have any slack.

If it does move, then those mounts are broken. To replace them, is not cheap & you have to remove the powerhead to reach them inside the exhaust housing under the powerhead. Not a simple job & if the motor happened to be around saltwater, the two vertical Phillips head screws that you see on each side of the upper exhaust housing (which hold the mounts inside the housing), may have to be drilled/milled out.

 

[oldboat1]

Re: Oily Discharge - Johnson 9.9

will bet the farm (yours, of course) that is unburned fuel/exhaust debris floating in the barrel. The location is at the surface of the water in which the leg is running, in looking at the pics. In keeping with Racerone's suggestion, squirt a little detergent into the barrel water -- won't hurt to let it circulate a little through the motor either, although it could free up a little more gunk which could also give you a little bathtub ring on your motor. It wouldn't hurt to run the motor in a little more water than shown (deeper), and if you keep refreshing the water with a hose, you may find the leg comes out cleaner, water drawn into the engine stays cooler and cleaner. all good things.

 

[oldboat1]

Re: Oily Discharge - Johnson 9.9

uh, that doesn't address machinist's post, though, and defer to him on that issue. Think there might be other functional issues/indicators with a broken mount, but not sure.

 

[metriccrescentwrench]

Re: Oily Discharge - Johnson 9.9

Is there a collection of unburnt oil in the bottom of the cowl? Sometimes when you tilt a carb engine up you'll get a bit of fuel/oil mix out the front of the carbs. Over time that'll accumulate in the bottom of the cowl, the gas will evaporate and leave you with an oily mess which can dribble down the leg.

 

[Putzaroni1]

Re: Oily Discharge - Johnson 9.9

I checked last night and on my engine stand if I try to move the power head left or right, forward or backwards it does not move at all.
I'm guessing this is a good thing but I'm still wondering if I should take a crack at fixing the seal as this would bug me I'm sure. I have a donor motor that I have recycled a few parts off already. I may attempt the powerhead removal on it and see if I'm comfortable with attempting this on something that runs..... That way I know what I'd be up against.

Bottom of cowl is clean

When referring to the "upper motor mount bellows" are you referring to where the exhaust tube connects to the powerhead or ??
I have looked on shop2.evinrude.com but can't find anything called a bellows so I'm trying to insure I know exactly what you're referring to before I tackle this.... Again, thanks.

 

[racerone]

Re: Oily Discharge - Johnson 9.9

For the 89 model I looked at it is item 51 that has the seals.---Time consuming work but not really complicated in my opinion.

 

[oldboat1]

Re: Oily Discharge - Johnson 9.9

hey Putzaroni -- read through this a little again. 45:1 fuel mix is unnecessarily rich and could contribute to plug fouling, incomplete combustion -- not way to rich, of course, but just suggesting it could contribute to what you are concerned about with a discharge. 50:1 is fine for the '89, and running with a richer mix likely won't make up for other shortcomings, and could make some problems worse. Just a thought.

 

[the machinist]

Re: Oily Discharge - Johnson 9.9

OK, I used the wrong nomenclature. That upper mount bellows is a rubber bellows to allow some vibration but is actually called a seal. I was trying to help ID which one. #51, 0340178 - Seal, #9, 0436469 - Mount Assembly, Thrust. There are 2 of the mounts (oner on each side) but only one seal.

If you go no forward/aft movement in the pivot shaft to housing assy, the mounts should be OK. These are hard to remove without twisting of bolts, so even if the leak is at the seal (bellows) I would just live with it.

 

[oldcatamount]

Re: Oily Discharge - Johnson 9.9

I had a 15hp Johnson very similar to yours and doing the same thing. I read through the owners manual and found that I had the wrong plug gap. Should have been .040. When I replaced and re-gapped the new plugs, the problem went away. (and the motor ran better) Just a thought.