Smoky 9.5

B

BrookfieldAngler

Recruit
Joined
Aug 20, 2010
Messages
5
I bough this 67' 9.5 Johnson from a guy for a hair south of $200. It fires up and runs pretty decent, but smokes ALOT. It has a nice pee stream and shifts into gear pretty smoothly.

There are a few things I am not completely understanding with this engine.

1. oil on plugs. Does this mean bad rings or could the oil mixture just be off?

2. black oily/sooty drip out of the exhaust

3. blackish drip out of that little hole on the cavitation plate that smells somewhat gassy.



I haven't done a compression check yet, but any ideas on this stuff?
 
C

Crazydave1243

Cadet
Joined
May 12, 2010
Messages
26
Re: Smoky 9.5

Your right one top of the problem with the rings. I would also check the spark and the oil to gas ratio. This could be a problem to if it is not burning all the gas the could get gas/oil fouled,or the fuel pump is pumping to much fuel in that case it will need to be rebuilt.The hole in the cavitation plate is for the exhuast too along with the one on the motor.
 
Joe Reeves

Joe Reeves

Supreme Mariner
Joined
Feb 24, 2002
Messages
13,262
Re: Smoky 9.5

Use the 50/1 fuel/oil mixture on that engine..... 1 pint of top quality TCW-III 50/1 oil to 6 gallons of gasoline. A gasoline octane rating of 87 will be fine.

(Carburetor Adjustment - Single S/S Adjustable Needle Valve)
(J. Reeves)

Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Note 1: As a final double check setting of the slow speed valve(s), if the engine has more than one carburetor, do not attempt to gradually adjust all of the valves/carburetors at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve/carburetor. It may be necessary to back out "all" of the slow speed adjustable needle valves 1/8 turn before doing this final adjustment due to the fact that one of the valves might be initially set ever so slightly lean.

Note 2: If the engine should be a three (3) cylinder engine with three (3) carburetors, start the adjustment sequence with the center carburetor.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.
 
R

Rick.

Captain
Joined
Jul 30, 2006
Messages
3,740
Re: Smoky 9.5

BrookfieldAngler said:
I bough this 67' 9.5 Johnson from a guy for a hair south of $200. It fires up and runs pretty decent, but smokes ALOT. It has a nice pee stream and shifts into gear pretty smoothly.

There are a few things I am not completely understanding with this engine.

1. oil on plugs. Does this mean bad rings or could the oil mixture just be off?

2. black oily/sooty drip out of the exhaust

3. blackish drip out of that little hole on the cavitation plate that smells somewhat gassy.



I haven't done a compression check yet, but any ideas on this stuff?
Click to expand...

1. A little oil on the plugs is normal.
2. Again this is normal. I know it seems awful when running in a barrel (my 9.5 does) but it won't accumulate out on the water.
3. Normal again. This is just unburned oil that has accumulated in the exhaust and runs down the leg to the drain hole. One thing I have noticed that will reduce the amount is to take a run at WOT at the end of the day for 5 minutes. That seems to heat up and purge the exhaust a fair bit.

They all seem to smoke more when running in a barrel but you won't notice it as much on the water. If it really bothers you, you can run synthetic oil and that will reduce the smoke but also takes a bite out of your disposable income. You would be wise to change the gear oil and water pump impeller right away and adjust your carb. as above. Glad to hear it runs well for you. Best of luck. Rick.
 
B

BrookfieldAngler

Recruit
Joined
Aug 20, 2010
Messages
5
Re: Smoky 9.5

Thanks for the replies everyone.

I took a look at the gas that was in the fuel can it came with and it was super dark. I ended up disposing of that and starting fresh. I took it out for a 5'ish mile run up river and back last weekend and it stopped smoking in about 3 minutes. When I got home, I looked at the plugs and they were nice and tan.

The new problems come in the lower unit. The lower unit has a leak somewhere. I bought and installed a seal kit for it, but it is still getting water in it somehow. I think it has something to do with the shift rod. I see no logical way for that to be a sealed unit. There is just a rod through a brass hole...how in the world can that ever be water tight??
 
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