Stihl 034 oiling too much!

[A31unit]

I recently acquired a Stihl 034 that I am tuning up and trying to return from a semi neglected condition. It seems to be just slinging oil during operation and of course is soaked on the bottom during storage as well. I have read numerous posts to diagnose the problem. Of course I got everything from the oil line (from pump to outlet) all the way to "that's just the way they are".
When I run the saw and give it throttle several times in spurts I actually have oil leaking out on TOP of the sprocket cover where it mates to the case??!! When I remove the cover the side of the saw is just soaked in oil.
So far I have removed the clutch and cleaned up the area around the pump. The oil line from the pump to the outlet appears to be intact and in good condition so I feel that the leak is not coming from under the clutch/oil pump area. The bar grooves and oil holes in bar are clear and free from obstruction.
My next hunch is possibly the oil tank vent valve. I have read to take a small pin and push it into the hole several times to work the guts back and forth to free it from dirt and allow it to operate properly. When I did this there is nothing there but an open hole that I'm pushing a pin into. I don't feel or seem to be moving anything inside. Is it like a check ball on a spring type thing? If so there is no question that its not working.
Would this cause my over oiling problem during operation?
Thanks

 

[cedarshark]

I had an 034 that threw lots of oil. In operation, does the saw use more than 1 tank of oil per tank of gas ?

 

[cedarshark]

The vent is under the inner side plate. Service manual says to use a 7mm drift to drive the valve into the crankcase and install a new one. I do not think the valve should be open.

 

[A31unit]

My 034 does not have an inner side plate (front chain adjuster). I do have the service manual.

 

[HarleyT]

Run the saw lightly without the bar/chain/cover, and watch...

 

[A31unit]

Run the saw lightly without the bar/chain/cover, and watch...

Im going to do this! Does anybody have the Stihl part number for the oil tank vent incase I need to buy one? Can't imagine it costs very much.

 

[HarleyT]

#1128 640 9100

 

[HarleyT]

$1.99

 

[a. palmer jr.]

I didn't see it in the posting, does this saw oil the bar and chain or just the bottom of the saw?

 

[CR888]

Use a drift/scrench with x27 head or a punch, something flat similar in diameter to vent and tap the vent from outside into the oil tank. Empty oil tank first, then shake saw till vent falls out refill hole. Blow/suck on vent and make sure its clean & air is going through one way and not both. It will make a fart noise when you blow through it as it has a rubber flap and spring inside. There only $2 part but normally just need a clean so they function again. Its NOT normal for a saw to leak bar oil all over the floor when stored despite many saying it is. Simple 5 minute repair once you know how to do it. Good luck.

 

[a. palmer jr.]

I don't mind them leaking a small amount of bar oil when sitting as long as they oil the chain properly when running. I usually drain mine anyway after use..

 

[A31unit]

Use a drift/scrench with x27 head or a punch, something flat similar in diameter to vent and tap the vent from outside into the oil tank. Empty oil tank first, then shake saw till vent falls out refill hole. Blow/suck on vent and make sure its clean & air is going through one way and not both. It will make a fart noise when you blow through it as it has a rubber flap and spring inside. There only $2 part but normally just need a clean so they function again. Its NOT normal for a saw to leak bar oil all over the floor when stored despite many saying it is. Simple 5 minute repair once you know how to do it. Good luck.

Does it seem easy enough to replace it? Does it tap right in easy enough? Sounds easy but I can see this being one of those things that I wished I never would have messed with.....

 

[a. palmer jr.]

Does it seem easy enough to replace it? Does it tap right in easy enough? Sounds easy but I can see this being one of those things that I wished I never would have messed with.....

If you have an air compressor I've heard you can blow through it or maybe take some carb cleaner and clean it that way, might not be your problem anyway..

 

[HarleyT]

Click on the image, and it will get bigger.......

 

[A31unit]

Well the over oiling seems like it was the result of only the adjustment screw under the saw being too far open. This has been the result:


It may be hard to see but within minutes it was soaked. I took off the bar and chain and ran the saw and all seemed good with no oil coming from anywhere but to the bar. I adjusted the flow rate from the adjustment screw under the saw from the "E" to almost the minimum and it seems way better. I should be good to go. The adjustment on this saw as far as oil flow seems to be all or nothing but I am happy!

 

[a. palmer jr.]

Many of the oiler adjustments are for running longer bars.

 

[A31unit]

Many of the oiler adjustments are for running longer bars.

That would make sense. The one I have is a 20" and the minimum setting seems sufficient

 

[HarleyT]

What brand/weight oil are you using?

 

[A31unit]

Stihl premium

 

[CR888]

Does it seem easy enough to replace it? Does it tap righy enough? Sounds easy but I can see this being one of those things that I wished I never would have messed with.....

I could honestly do it with my eyes closed in the dark. Its easy peasy just remove the metal plate that surounds your chain adjuster (1xlittleX27 screw) and behind the plate you will see the vent that's about the size in diameter of the screw you removed, it will have a little hole in the middle. Put your X27 scrench over it and tap with hammer/block of wood until it falls into your empty oil tank. After a clean replace it from outside of saw with the end with little hole facing you and tap it back into place which is a mm past flush. It took me longer to type this post than to fix your saw.lol