Stihl 041AV not running

[BigCountry92]

I bought this saw off of marketplace. (His father in law passed away and he couldn't get it running) Oil is leaking out of the spark plug hole after I've emptied fuel and bar oil. I've tried new fuel with proper ratio. If I take the spark plug out I can pull the pull cord, if I put the spark plug in I can only pull the cord about 6 inches until it stonewalls me. I put new sparkplug in and it gets covered and dripping in oil. I just took it apart and put it back together and replaced carb gaskets but didn't see anything obvious. Any ideas? I'm at a loss at this point.

 

[BigCountry92]

I bought this saw off of marketplace. (His father in law passed away and he couldn't get it running) Oil is leaking out of the spark plug hole after I've emptied fuel and bar oil. I've tried new fuel with proper ratio. If I take the spark plug out I can pull the pull cord, if I put the spark plug in I can only pull the cord about 6 inches until it stonewalls me. I put new sparkplug in and it gets covered and dripping in oil. I just took it apart and put it back together and replaced carb gaskets but didn't see anything obvious. Any ideas? I'm at a loss at this point.

Additional info, I've taken the saw almost completely apart, the cylinder moves as it should, does not appear to have excessive carbon build up anywhere.

 

[BigCountry92]

I bought this saw off of marketplace. (His father in law passed away and he couldn't get it running) Oil is leaking out of the spark plug hole after I've emptied fuel and bar oil. I've tried new fuel with proper ratio. If I take the spark plug out I can pull the pull cord, if I put the spark plug in I can only pull the cord about 6 inches until it stonewalls me. I put new sparkplug in and it gets covered and dripping in oil. I just took it apart and put it back together and replaced carb gaskets but didn't see anything obvious. Any ideas? I'm at a loss at this point.

Also appears to have an intermittent weak spark.

 

[hunter72]

There is a o-ring or seal on the oil pump that you need to replace as I remember, to keep oil from migrating to the crankcase while sitting idle for a long time. I did one many years ago. You are getting hydro lock from the oil you cannot compress it.
Hope this helps.

 

[Brushwacker]

There is a o-ring or seal on the oil pump that you need to replace as I remember, to keep oil from migrating to the crankcase while sitting idle for a long time. I did one many years ago. You are getting hydro lock from the oil you cannot compress it.
Hope this helps.

I sold an 051 locked up years ago, later talked to the buyer, he said it was hydro locked.
I remember reading about the oil pump not sealing also.

 

[BigCountry92]

There is a o-ring or seal on the oil pump that you need to replace as I remember, to keep oil from migrating to the crankcase while sitting idle for a long time. I did one many years ago. You are getting hydro lock from the oil you cannot compress it.
Hope this helps.

Thank you! I

There is a o-ring or seal on the oil pump that you need to replace as I remember, to keep oil from migrating to the crankcase while sitting idle for a long time. I did one many years ago. You are getting hydro lock from the oil you cannot compress it.
Hope this helps.

Thank you! I looked into this exact problem on YouTube and the guy gave the proline part number for it! So, I have that ordered and I'll update as soon as I can. Any advice on getting the residual oil out after I replace that seal?

 

[BigCountry92]

Link to the oil pump seal in question

https://sawzillaparts.com/proline-o...stihl-041g-041av-041-farm-boss-1110-647-9000/

 

[hunter72]

As I remember I pulled the plug put the switch to off and flushed both the cylinder and crank case out with fuel mix. You have to turn the saw in many directions after you pour the mixture in the carb with the piston at TDC, to get the oil out of crank case. Then let it air out.
Hope this helps.