seal drag

[bandmiller]

Is it normal for new seals to add drag to the crank.(no jug or piston) will they wear in soon after running saw. Lubed with grease.

 

[NevadaWalrus]

The very nature of what a seal must do will add a small amount of drag. When cold, probably a bit more. I've always preferred to assemble 2 cycles with the same fuel/oil mix that will be used to run the engine. Engine parts are going to get nothing more anyway and the grease you used, when cold, is itself going to add resistance, maybe even more then the seals.

 

[Newfie]

This site is great!! A walrus giving advice on seals.

 

[NevadaWalrus]

They make fine pets.

 

[sedanman]

Newfie...........LMFAO!

 

[Fish]

Which saw are you talking about? If you notice extra drag, then something is wrong. Is the saw a Stihl 021/023/025 series?

 

[stihltech]

seals

When assembling a bottom end, the crank should spin freely with no seals, but still spin over fairly easily by hand after the seals are in place. Youy would hardly notice the drag after the flywheel is put on, and not at all when using the starter.

 

[bandmiller]

Thank you stihltech,thats what I wanted to know. Iam learning about saw repair. As with all repairs its not the black and white, the devil lurks in the gray areas.

 

[Fish]

So which model saw do you have?

The Devil....

 

[bandmiller]

You talking to me Fish, hear goes 046,031,S-10,285,two 61,266,dolmar119. You anywhere near Dry Ridge Ky.

 

[Fish]

S-10, is that a Chevy?I went to NKU for a year when George
was there, and I have to admit, I was much better looking.

 

[Fish]

Since you brought it up, here is one of our youngest pets, "Brokeback
kitten".

 

[Fish]

And my boy "luke", and "tink" napping on the lazyboy.

If you are not sure which one is the boy, then you need to get out more................

 

[Peacock]

I'm confused....

 

[troutfisher]

This site is great!! A walrus giving advice on seals.

Thats fr!ggin great!!!!:hmm3grin2orange: :hmm3grin2orange: :hmm3grin2orange: :hmm3grin2orange:

 

[2506]

Chainsaw Mechanic Trng

Where can I find information regarding chainsaw repair? I am a mechanic, but not on 2 strokes. I understand they all suck, squeeze, bang and blow, but in a slightly quicker fashion. Training manuals and books are a good start, but can't find any good, comprehensive ones in my area or even the internet. The books I can find are very basic and not very helpful overall.

 

[klickitatsacket]

let's get this topic back on track. This is one of those areas that I have been facinated with. All seals have to touchto seal and there fore impart some drag. Because we do bearings we have also looked at the simple oil seal a little. The thing that absolutely blew me away was the amount of complication that can go into the engineering of oil seals. Apparently a properly designed seal has more drag under opperation. The crank case presure (negative and positive) causes the seals to push against the shaft and seal. Talking with some engineers about the seals on stihl saws there were 2 things that I found interesting. #1 When stihl was putting shields on the inside of their bearings is was to help put less pressure on the seal so that there was less drag. This of course was a disaster for the bearings. #2 there is a better type of seal where the rubber fits into a groove on the shaft but this creates a weak spot and is not good for high spead applications.

A cool thought for 2 strokes would be to use oil resevoirs that feed a loose fitting seal to mix the oil with the fuel in the crank case. It could allow for better lubrication of the bearings and less drag from the seal. May or may not work but it is a cool thought. one issue might be oil leaking into the crank case when sitting. This might be fixed though having a seal designed to open under negative pressure and close on positive pressure or ar resting position.

 

[JoeCanuck]

furry

They make fine pets.

Was that 'pets' or 'pelts' :taped:

Joe

 

[GASoline71]

This site is great!! A walrus giving advice on seals.

Dang you Mike!!! That make twice in one week I have to wipe coffee off my keyboard.:biggrinbounce2: :biggrinbounce2: :biggrinbounce2:

Gary

 

[oldsaw]

Was that 'pets' or 'pelts' :taped:

Joe

Pelts, you drag the seals after you club them.

Mark