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266 oiling out the clutch cover

Started by David B, September 24, 2022, 05:29:25 PM

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David B

@weimedog  and @Spike60 might get a kick out of and be able to shed some light on this. Haven't run this 266 a lot but I think it's always done this. It has what I assume is  the tank vent between the bar studs but doesn't seem to be coming from there. It's chewed up above the oil slot ( I put a new plate on but haven't tried it yet) but it doesn't seem like that would cause the oil to run out the cover. I have a 61 I built into a 266 as well and the metal brake flag cover doesn't have that hole in it, nor the tank vent in the case...but I don't think the oil should be getting to that area anyway. That is a Stihl tsu I put on to test some hexa. I think it does it with husky pattern bars too. 




 

 

 
Machine and welding shop day job, trees after work.

DHansen

I agree with your observations of the hole in the brake cover between the bar mount studs.  Metal flag no hole and plastic flag has the hole.

 


DHansen

My 266xp does not have that hole and my guide plate would cover that hole it it were there.

 

 

DHansen

What I noticed is how much metal is missing above the oil channel on your 266xp.  My thinking is it is allowing oil to seep behind the bar and fill the cavity between the bar mount studs.  I would think you need to get the oil channel to seal better against the bar.  Just my 2ยข worth.  See what others say.  The two guys you directed your question to will know.

David B

I should add that I tested some "baby C" chain first on a 20" husky bar and it seemed to oil well. I think the 24" chain I removed was nice n oily. Then I tried the Stihl bar and hexa and it oiled a bit but the chain was quite hot when I removed it. Spotty oil on the chain.

I later installed the Stihl bar without chain or clutch cover and it seems to oil into the channel normally. 
Machine and welding shop day job, trees after work.

DHansen

Compare the oil holes location on the Sthil bar vs the Husky bar.  The distance from the chain adjuster hole to the oil hole looks farther away than on my bar.  Maybe it's still lined up on the oil channel on the saw.  I could dig out one of my Sthil bars and compare.

DHansen

Post some more photos of the oil feed channel.  Try to show the metal on the upper part of the oil feed channel, from straight on and from the top.

David B

 

 

 

Mounted the husky bar back up without the cover. Oil bubbles out the vent through the upper tensioner hole. The Stihl bar covers the vent hole, but the channel in the plate would let it run down into the stud groove in the bar. 
Machine and welding shop day job, trees after work.

David B

The oil hole locations in the bars are close, oil does flow into the Stihl bar. 

That area in the case above the oil channel is definitely eroded a bit. 
Machine and welding shop day job, trees after work.

David B

 


Fixed this pic :




Oil also runs down the slot in the plate behind the bar into the bar stud slot. Then it builds up and runs out the hole in the clutch cover. Maybe I need a plate with no vent slot. Maybe something is creating pressure in the tank? 🤔
Machine and welding shop day job, trees after work.

David B

...plug the little son of a gun up and put a vent in the top of the tank...
Machine and welding shop day job, trees after work.

Guydreads

One thing I noticed is that the lower oil hole (for when you flip the bar obviously) is really dirty. So if the other one is, therefore the pump is going to struggle against that, therefore sending oil out the tank vent. Make 110 percent sure that the oil port on bar, and the groove in the bar is clean.

Spike60

Short awswer here is that the tank vent tube is not sitting where it belongs, and is probably not attached to the case on the clutch side where it belongs. You can see it in the pic looking into the oil fill hole. Shouldn't be visable like that.

But something doesn't add up here for a 266. Kinda wondering if this saw, or at least the bottom end, didn't start out life as a 266, because the later tube style tank vent with the extra hole between the bar studs was a later developement. What year is that saw? This could be a final year 266?? I'm a little puzzled myself on that.

The early saws on this chassis used a brass plug for a tank vent which was located under the muffler just above the oil fill hole. None of those saws have that extra hole between the bar studs. The other side of that hole on the later saws is where the plastic tube/vent line attaches. It is supposed to ride at the top-rear of the tank towards the cylinder base. Probably a service bulletin out there about when this change took place, but can't look it up here at home.

As far as the extra hole in the plastic flag covers goes, it doesn't have anything to do with oiling. Like a 372, it is for a screw to keep the outer bar spike attached to the side cover.

Gonna need a long, skinny pair of pliers to get that tube back on. Don't plug it up, cause you'll no longer have a tank vent and you'll go from a leaker to a saw that won't oil at all. :) 
Husqvarna-Jonsered
Ashokan Turf and Timber
845-657-6395

David B

Thanks, Bob.

The tube is installed...I'll see if I can tuck it up higher. My 61 has the sintered brass vent under the muffler. I have more cases for this chassis, maybe I'll end up swapping it over. 

Saw was complete semi running when I got it well used from a tree co over the hill. Who knows the repair history. I'll get a pic of the plate. 
Machine and welding shop day job, trees after work.

DHansen

Could you clean up the area around the vent hole, fill bar oil tank to 3/4.  Put cap on it and set the saw in the sun.  With bar and guide plate left off.  See if oil leaks from the vent hole.  Eliminate or confirm that the oil is actually from vent hole.

David B

@DHansen i could see it bubbling out while the saw was running, clutch drum turning with the clutch cover off. 

@Guydreads i keep my rails and oil holes clean. 

Here's the data plate and whole saw. 

Found a set of 162 cases with no apparent vent...vent thru the cap? 



 

 

 
Machine and welding shop day job, trees after work.

DHansen

Just to clarify.  You see it bubbling oil out the vent hole with the saw running, but not leaking from the vent hole with the saw not running?

DHansen

Sorry if I am being a pain.  Just trying to understand the bar oil leak. 

David B

No worries. Yes, correct. Having problems with the power in my house. Next time I get a chance I'll do a video. 
Machine and welding shop day job, trees after work.

Spike60

Moving that vent line up to where it belongs should solve the leak, but the tag doesn't solve the mystery.  :o

Tag reads that it is a 1991, and that could explain the later style vent line. But a 1991 266 is an oddity in itself. The 266 was replaced by the 268 back in 1987/1988. Can't recall a 266 later than 1987. So, what gives here? I hate filling in the blanks with guesses and "must be's", but....

Husky has frequently continued to produce models after they have been replaced. They still make the 272 and 288 in Brazil. Also, back then the sales organizations for both Husky and Stihl were quite different than they are today. Rather than a wholly owned company that covered the entire country, they were sold by independent/regional distributors. They would buy the product from Europe and sell it through their own sales network. Each distributor to a degree could choose what model line up to offer their dealers, and there were some differences.

Just a theory, so it's a "might be", not a "must be".   :)
Husqvarna-Jonsered
Ashokan Turf and Timber
845-657-6395

David B

Machine and welding shop day job, trees after work.

David B

162 on right. Very small oil fill. Cap I found in my parts stash doesn't fit by just a hair. 

 I will try to tuck the vent line rearward on the 266, I have forceps. 



 

Machine and welding shop day job, trees after work.

Spike60

Husqvarna-Jonsered
Ashokan Turf and Timber
845-657-6395

David B

Now I need to find one as this set of cases is useless without it. 
Machine and welding shop day job, trees after work.

DHansen

So I can better understand this oil tank vent system.  The 266 that DavidB photographed and is working on has an oil tank vent hole near the bar mount studs.  Attracted to this hole is a hose/straw about 4" long.  This hose just sticks up toward the oil fill cap and toward the top of the oil tank.  Nothing inside the oil tank holds the hose/straw in place?  No one way check valve on the hose?   The other earlier model 266 that I photographed has a oil tank vent near the oil fill cap at the top of the oil tank.  Looks like a porous brass filter.  So if these are the two style of oil vent used on the 266, why the need for/or remarks about a vented oil cap?  Am I missing something.  And if I'm understanding this the model 61 should have the oil tank vent like DavidB has on his 266.

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