Bar oil leak?

[Hunt4lumber]

I've got a Ms 180 and a 290 that I've taken apart 2 times trying to stop a bar oil leak near the pumps and can't figure out what I'm missing as far as finding what is worn that's causing these leaks( leaks while running and causes a big puddle after it's turned off)
Could it be worn around plastic bushing that pump shaft goes through?

 

[rd35]

Does the saw only leak a small amount after cutting and then stop leaking after that?

 

[Hunt4lumber]

It's a puddle that is 2 times the diameter of the saw( so it's substantial)

 

[Franny K]

Have you been using that top of the line Stihl bar oil that is clear? I seem to have had a lot of mess sitting after using a gallon of that. Could be coincidence but that is all I can add at this point. Dedicated funnel and gallon jug to dump out bar oil when done using until it gets figured out.

 

[HarleyT]

Those 2 saws have entirely different oilers.
To access the oil lines, you will have to get the wrap handlebars out of your way, if that is where the leak is coming from {likely}.

 

[HarleyT]

here is what the MS180 one looks like, the grommet on the end of the line presses up into the crankcase at the oil pump.

 

[CR888]

Checked the tank vents?

 

[Hunt4lumber]

How do I check the tank vents?

 

[HarleyT]

On the MS180, just remove the cap and look at it. It is the little green booger on the top of the tank....
Unless it is not there, it is likely not your problem.

 

[HarleyT]

Just dump out your oil, and fill the tanks up with gas mix {outside} and move the saw around and see where it leaks.

 

[HarleyT]

Here is the vent on the other saw.

 

[Hunt4lumber]

Is it the small hole behind the rear bar stud bolt?

 

[dmb2613]

front bar stud the small metal plug with tiny hole

 

[Hunt4lumber]

Right, front stud...
What am I looking for on this small hole?

 

[HarleyT]

Nothing really, it likely is not the problem.

 

[HarleyT]

It is supposed to let air in without leaking oil out.

 

[HarleyT]

So a vacuum won't be created in the oil tank as oil is being pumped out.

 

[HarleyT]

Same with the MS180.

 

[HarleyT]

Here is what the inside areas of the MS180 looks like.

 

[dmb2613]

I expect it is normal