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Discussion Starter · #1 ·
ive got a murc 8 horse its a 1996 ive got some milkshake looking stuff comeing out of the exhaust ive replaced the gaskets from the top down to the bottom and the water pick up seals its not the head gasket i guessing that its the seals in the prop shaft and the gear oil is mix withthe pick up but im not sure so any advice would help thanks
 

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Sounds like it is the prop shaft seals, since you say it's milky. If that's the case, then the gear case oil should be low or going down. The reason I mention that, is that if your 8 horse is a 2 stroke, and it is running rich it could just be unburned gas/oil mixture. This happens on my Evinrude, especially during cold weather. A few days after it has been run, I notice drops of oil coming out the prop exhaust and puddling on the floor. Like I said, if it's actually a bad propshaft seal, you'll notice the gearcase oil level going down.
 

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Discussion Starter · #3 ·
ok so ive fixed the seals in the lower unit and the head but it still has the stuff coming out of the exhuast ive replaced every gasket or seal from the head down so confused can anybody help !!!!!!!
 

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probably running it a little rich on oil (2 stroke). Check the fluid level in the lower unit (exhaust goes mainly out the prop on that right?) if it is fine then its probably just oily exhaust which is normal in a 2 stroke.
 

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Tone, check the lower unit oil and see if it is milky. IF it is then you have water getting into the gear case. IF it isn't then it is probably running a little rich. Did you remember to change out the sealing washers around the drain and filler screws? Also it probably is time to de carb the motor as well if you haven't already done so.
 

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Discussion Starter · #7 ·
ive checked the gearoil and its ok i had the prop shaft seals replaced and all the gaskets from the bottom up to the head also the side of the head gaskets to and the gasket for the water pump on the back of thr head it is a 2 stroke and im running it 50 to 1 on fuel man this is very frustraiting i guess i have to take it in to the shop didnt want to do that if there isnt anything eles i can do
 

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Tone, I wouldn't take it in just yet. I would try a de-carb on it first. I had a Suzuki 8hp that used to have some of the same milky stuff coming out of it. What that is is unburned fuel residue. Here is a good method for de-carboning your engine and it will probably take care of the problem. This method also works with the motor in a barrel of water. Good luck to you.

This works for Carbed, EFI, Ficht, HPDI, Optimax and even 4 strokes...
First you need a separate small fuel tank. One of those 3 gal red Tempos works great or an empty gal milk jug will also work, but might be a bit messier..
I use Seafoam over the OEM stuff like OMC Engine Tuner or Merc Power Tune because in the last few years they changed the formula and you have to let them sit up 12 hours. Who's got time for that?? Seafoam you can buy from NAPA, CarQuest or other auto stores. Seafoam works in 15 mins.
You'll need 3/4 gal of gasoline and one 16oz can of seafoam for each engine. Don't forget to add 3oz of oil if you are premixing in a carbed engine. Use about 3 ft piece of fuel hose off the little tank. You connect this tank to your engine by pulling off the main tank fuel hose off the intake side of your water separating fuel filter and plug the hose off the small tank on to that fitting. Or you can separate the fuel line on the tank side primer ball, so you can still use your primer. If you have an engine that has fuel plug then you need a fuel plug on the little tanks hose.
Start the engine, let it warm up and start pulling the mix into the engine. You may have to increase the idle to keep it running once she get loaded with the Seafoam. Run the engine 15 mins in the dock or just cruising around under 2500. Then shut it down and let it sit for 15 mins. Restart the engine, the smoke you see is the carbon burning off. Do the whole thing again and let her sit again for 15 mins. If she smokes after the second time do it again, but I've never seen one still smoke after three doses. The gallon mix should be enough to do this 3 times. You don't need any wide open throttle, you don't need to change the plugs. If it's cleaning the combustion chambers it's also cleaning the plugs, but every 50-60hrs is good time to change plugs in most engines.
I cleaned a antique evinrude one time that had a 1/4" of solid carbon on the exhaust chamber walls by running a 1/2 gal of the mix through it. Seafoam has been around since the 30's and it's what they used when they were burning straight 4 stroke 40SAE oils in outboards.
You guys with the 4 strokes think you are immune from this? Those engines work 10 times as hard as any auto engine ever will and they will carbon up. I bought a Bronco two years ago that had 95,000 miles on it. When I used seafoam on it I had the neighbors hanging out of their front doors looking for where the fire was after I started it the first time there so much smoke.
Too many are under the assumption that it's totally the 2 stroke oil that causes the carbon, Wrong... it's also the additives they put in the fuels today. The carbon inhibitors in 2 stroke oil are there for this reason also. Remember when gasoline used to smell like gasoline, today it smells more like bad cologne.
For those guys that like to do the carbon treatment by spraying it down the carbs Seafoam also comes in spray can called Deep Creep. It's the same stuff under pressure. Says right on the can Oxygen Sensor Safe, for you Yam guys.
After that if your engine maunf recommends a daily additive treatment then do that in the mean time, but all 2 stroke outboard need decarboned every 50-60hrs. If I owned a 4 stroke I would do it the same. Once you are set up with the tank and hose the Seafoam is only 5-6 bucks can. It to easy not to do it.
 
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