STIHL 025 Oiling Too Much

[jimholly]

My tried and true STIHL 025 suddenly started pumping way too much oil, dripping in use, getting lot's accumulated under the bar/sprocket cover. It's the same cheap Tractor Supply bar oil that I always use. It's dry under the sprocket, so not an oil pump leak. It doesn't leak when it's not running. I fired it up with the bar and cover off, and it pumped quite a bit out of the 'oiler' hole. Any ideas on why I might have the sudden excess? It's a real mess.

 

[catbuster]

Have you checked to see if your bar oiler hole is plugged? The saw may not be oiling too much, it may not be able to get the oil to the bar and it subsequently finds another path to discharge.

The side plate that covers the oiler hole, chain tensioner and bar studs can warp and let oil underneath as well.

 

[jimholly]

Thanks for the tip. The oil flows from the oiler hole when the saw is running with the bar removed, so not plugged.

I guess the "side plate that covers the hole" in this case is the bar with it's oil port hole lined up with the oiler hole in the saw. The bar is flat.

 

[catbuster]

Thanks for the tip. The oil flows from the oiler hole when the saw is running with the bar removed, so not plugged.

I guess the "side plate that covers the hole" in this case is the bar with it's oil port hole lined up with the oiler hole in the saw. The bar is flat.

That’s not what I was saying, on both counts. Check the oiler hole on the bar. Then, there is, or should be, a thin piece of bent sheet metal that sits between the crankcase and the bar. If it’s misshapen or not tight against the case, bar oil will go between it and the case and cause a situation you’re describing.

 

[HarleyT]

How thin is this batch of oil?

 

[jimholly]

Thanks guys. The bar oiler hole is clear. I don't think that there has ever been a metal piece between the bar and saw body. As far as oil thickness, I'm using the same rather thick bar oil from Tractor Supply, that I have used for a long time. I attached a couple pictures. Maybe their is something I'm overlooking.

 

[HarleyT]

Can you take the same view/pic of the bar, but just a tad farther away? The slot looks a little splayed out, but it may just be a visual thing.

 

[HarleyT]

Splayed a lot at the tail.

 

[HarleyT]

The rail/slot gap should be the same all the way....

 

[jimholly]

The rail slot is the same all around with a slight widening at less than a quarter inch from the end. The outside of the bar is dead flat. Not sure how this might be related to a sudden increase in oil flow?

 

[HarleyT]

Not really any increase in oil flow, but the oil splooging out the back because of the splayed out rails. The driver links push the oil in a tight slot, but on yours, the oil just oozes out the back.

 

[HarleyT]

You may just might be mistaking the oil drooling down the side of the saw, as "over-oiling"....
Flip the bar, and take a pic. See if that slot is any better.

 

[HarleyT]

So being splayed at the tail,

doesn't that cause stained shorts?

 

[jimholly]

Well, I never thought of that. The .063 bar slot now measures .072 with feeler gauges, pretty much all around. The bar edge is square. It cuts fast and straight. Is .072 getting to the end of the bar life?

 

[HarleyT]

Well, the oiler is non-adjustable, and commonly known as stingy on oiling, and how it is made, can "almost" never "over-oil"... So it is either different viscosity, or just oil going where it is not supposed to go.....

 

[HarleyT]

Here is the tiny oil pump, pressed into the plastic crankcase.. No adjustments, no possible way to start "over-oiling".....

 

[HarleyT]

Only possible way to go is oiling less....

 

[jimholly]

Yea. It's a mystery to me.

 

[HarleyT]

So, did you flip the bar over?
Bother taking more pics?

 

[TRTermite]

You say the bar is flat what does the area around the bar studs look like?? any bulge, or cracking from movement/ distortion when torquing the bar cover nuts?
Harley may get short, but he thinks outside of the box with experience. Stick with him he'll be a wealth of info for you.