115Hp Johnson Outboard

[Bbots11]

Hi guys, I am a novice boater but none the less really eager to learn and feel comfortable on the water. I got a 17 ft Silverline with a 115Hp Johnson 2-stoke outboard. I got a tune up at my local marine mechanic and said she is good to go with a new impeller, lower unit oil change, etc. First time I took her out it was great and no problems. Second time I mixed the oil and gas myself with a 75:1 ratio (Mechanic suggestion). Right when I got out of the marina smoke from the exhaust and rumbling occurred. Shortly after the boat slowed down quickly and engine shut down. It would start no problem after that but would shut down after any forward thrust was tried. Harbor patrol towed us in. Does this sound like an oil and gas problem or something bigger than that? Thank you in advance for advice.

 

[rockyrude]

Re: 115Hp Johnson Outboard

You don't say how old the motor is or how long it sat. If you are mixing the oil yourself, this is not a VRO correct? The accepted mix ratio is 50:1, nobody likes going leaner than that. What exactly did you mechanic do?

 

[Chris1956]

Re: 115Hp Johnson Outboard

75::1 gas oil mix is about 10 oz oil to 6 gal of gas. Is that what you used?

 

[Bbots11]

Re: 115Hp Johnson Outboard

75::1 gas oil mix is about 10 oz oil to 6 gal of gas. Is that what you used?

The motor is a 1996. It sat for one week, Sunday to Sunday. From mixing the oil and gas sat about 2 horus and I used 8 oz of oil for 5 gallons of gas.

 

[emdsapmgr]

Re: 115Hp Johnson Outboard

OMC made two completely different 115's in 1996. The older crossflow and the newer looper. Which do you have? If you don't know, post the model number. Both engines had an automatic oil mixing pump-originally installed at the factory. Just add oil to the oil tank and the engine does the rest. Is there some reason you are mixing it with the gas?

 

[Bbots11]

Re: 115Hp Johnson Outboard

OMC made two completely different 115's in 1996. The older crossflow and the newer looper. Which do you have? If you don't know, post the model number. Both engines had an automatic oil mixing pump-originally installed at the factory. Just add oil to the oil tank and the engine does the rest. Is there some reason you are mixing it with the gas?

The only reason I had been mixing because this is what the previous owner of the boat told me. The boat does have a non-functioning 40 gal gas tank below that is not wired because of problems. I have it hooked up to an external tank on deck.

 

[bob johnson]

Re: 115Hp Johnson Outboard

you are way low on oil...for 6 gallons of gas you usually need a pint of oil (16 oz).

but i would worry more about the engine shutting down....if it was because of low oil , you probably damaged the motor... you dont usually damage much with too much ouil...you just foul the plugs earlier and create a lot of smoke....

bob

 

[emdsapmgr]

Re: 115Hp Johnson Outboard

I'm confused. Why are you adding oil to your gas? Your engine was originally made to automatically mix oil and gas in the fuel pump on the engine. The engine would draw fuel from one source and oil from a remote 1.8 gallon oil tank somewhere under a rear deck in the boat. Under this scenario you don't need to add extra oil to the fuel tank. UNLESS: Has the original VRO pump system been disabled on this engine or not? If the original oil/fuel mixing pump is still operational on the boat and you are adding more oil to the fuel, that can be the reason for all the exhaust smoke. Also possible that the engine was severly overheated and it suffered an overheat lockup. That might explain why it would not restart.

 

[toddschubert]

Re: 115Hp Johnson Outboard

He said it will start just no throttle.
Ask PO about VRO disabled if you don't know how to check. Like hose from VRO pump disconnected and a wire disconnected (alarm brown)
Am I correct on VRO EMDSPMGR?

 

[Bbots11]

Re: 115Hp Johnson Outboard

He said it will start just no throttle.
Ask PO about VRO disabled if you don't know how to check. Like hose from VRO pump disconnected and a wire disconnected (alarm brown)
Am I correct on VRO EMDSPMGR?

I will check the VRO and see if it is still connected or not. If that is the case and it is connected and I added oil in the gas, did I cause damage to the motor. It sounded like it was trying to go when I would start it but just wasn't firing enough combustion to make the boat throttle forward.

Ps thanks for all the advice.

 

[emdsapmgr]

Re: 115Hp Johnson Outboard

If the original VRO is still connected and functioning on your engine-and you added more oil to the fuel tank, yes you are overoiling. Not a real problem. Overoiling is better than too little. It will smoke a lot if overoiled. (Probably not a good idea for the long run.) Once you determine if the factory system is still functioning, you can quit adding oil to the fuel tank. Eventually the oily gas will get consumed and you will be back to normal. If you are having problems with the boat planing, possible the engine is not running on all 4 cyls. The engine will run seemingly "normal" on 2 or 3 cyls. You need all 4 firing to plane the boat.

 

[eclark53520]

Re: 115Hp Johnson Outboard

Odds are(assuming the VRO is functioning properly) you are really rich with oil in the gas.

Get rid of that gas(after you confirm the VRO is functioning) and just run the gas without oil, but do remember to fill the oil reservoir.

Good luck!

 

[john0353]

Re: 115Hp Johnson Outboard

i have a 1994 johnson 115, i had a problem like this, i rebuilt and cleaned the carbs and it fixed the problem. as for the VRO, that system was faulty. it should be disconnected. if it isn't it needs to be. The ratio is 50:1.