Oil leakage in exaust

[MIDBOB]

I found comments that my 90 HP Johnson outboard leaking oil out the exaust at prop is normal and not to worry. In my case, if the motor is left unused for a couple of months, it will not start. Had a tech open the four brass screws by carbs and clean them out - they had oil packed in the holes. This has happened twice in the past year. The primer bulb stays tight on the oil tank all the time and I was told by the tech that it is the constant oil pressure that is causing the problem. I am thinking of installing a cut off valve in the oil line before it gets to the motor.

Anybody have suggestions?

 

[tashasdaddy]

Re: Oil leakage in exaust

i'm thinking you OMS pump is leaking. what year 90?

 

[ezeke]

Re: Oil leakage in exaust

Are you doing something to shut off the supply of gasoline when you shut down? Is your oil tank seated higher than the engine?

 

[MIDBOB]

Re: Oil leakage in exaust

i'm thinking you OMS pump is leaking. what year 90?

It is a 2000.

 

[MIDBOB]

Re: Oil leakage in exaust

Are you doing something to shut off the supply of gasoline when you shut down? Is your oil tank seated higher than the engine?

Doing nothing to shut down gas supply. The oil tank is in a cuddy that is maybe just a little higher than the motor but close to level to it.

 

[ezeke]

Re: Oil leakage in exaust

The pump is basically a lift pump. When there is no pulse from the piston's stroke, there is no lift.

I believe that your oil is siphoning through the system and you will either have to add a petcock or lower the oil tank. It should be as close to the engine as possible anyway.

A bike shop will probably have better selection than a boat dealer: http://www.golanproducts.com/fuel_valves.html

 

[MIDBOB]

Re: Oil leakage in exaust

The pump is basically a lift pump. When there is no pulse from the piston's stroke, there is no lift.

I believe that your oil is siphoning through the system and you will either have to add a petcock or lower the oil tank. It should be as close to the engine as possible anyway.

A bike shop will probably have better selection than a boat dealer: http://www.golanproducts.com/fuel_valves.html

Local motor repair shop said when stowing for a couple of months to take the top off the oil tank and then open the brass screws by the carbs and it should take the pressure off the bulb and drain any excess oil.

I think your idea is best. I will try opening the oil tank filler cap and see how it goes - but I found a valve at West Marine that I can install in the line right before it goes into the motor. I'll try that if opening the oil tank does not seem to resolve it.

Thanks