NSP2. Cuz PA WiFi sucks

[PA Dan]

I would imagine that it would be washed out continuously as the saw cycles. When Stihl ran BOTH shields there was a limited amount of fuel mix across the bearings. It was enough to lubricate but not enough to wash away contaminants. Leaving the contaminants trapped with no way to be removed.

So what would the advantage of leaving the outside shield be? Keeping heat away from the seal?

 

[DuratecMan10]

Afternoon guys. Took a nap, had ham hocks and collard greens for lunch, started making lentil soup for dinner, now I'm replacing the valve cover gasket on my mom's car and watching the Alabama game, hoping we win!


Sent from my iPhone using Tapatalk

 

[Stump Shot]

It keeps some of the combustion products away from the seals. Stihl was thinking along the right lines when they tried the shielded bearings in the larger saws, but they
made the mistake of having both shields in which trapped fine sawdust in the bearing itself, leading to failures. Their thinking was that the shields would keep fine sawdust
out of the bearings.



My long term testing in my own saws has yielded excellent results. My back-up saw is going on six years with the set-up and the seals are doing great (aftermarket seals at that). It has about 300 hours run time.

I did do one with both rubber seals running on grease alone and packed grease for the seal on a race only saw, thinking was to reduce the case capacity that extra little bit.

 

[ajschainsaws]

(Re)Build it faster.

it’s the OPE ways

 

[jacob j.]

I did do one with both rubber seals running on grease alone and packed grease for the seal on a race only saw, thinking was to reduce the case capacity that extra little bit.

I think grease only would work fine for a race saw - they tend to live short and violent lives anyway...

I got a two-piece head Solo 680 that was raced in an open class in the early 2000's. It only saw-ed about 10 races or so but needs a full rebuild due to
running on methanol and (I believe) not getting flushed out properly. It's a dandy runner though.

 

[jacob j.]

I believe you could always get them without shields or seals. But it was $1.50 - $2 cheaper to buy them with the seals in. I think when I ordered them from Greece they were about $4 each with rubber seals.

I leave the grease in them too. I can’t imagine that it lasts longer than 20 seconds of run time. Plus, there’s no doubt that there’s a good bit of lube in there for the first break-in

I definitely wouldn't run the rubber shields in a saw engine - I don't think they can handle the heat (Although the electric motor on my Simington can get quite warm and it has RS bearings in it from the factory).

 

[p61 western]

Good afternoon fellas.

 

[Czed]

good afternoon guy's

 

[Lightning Performance]

Slacking

 

[usmcbuckwild]

So what would the advantage of leaving the outside shield be? Keeping heat away from the seal?

From what others have posted and my own mental gymnastics the outer shield (with the slits in it) will help reduce amount of debris that is washed against the seal while still letting some fuel mix out to the seal to help lube it. I also think it will help reduce pulse pressure away from the seal. That is only my own thoughts, could be complete horseshit for all i know.

for all we know keeping outer shields may help reduce case volume and increase case pressure increasing transfer velocity. Who knows until it is tried and compared? I wouldn’t mind seeing 2 saws built identical to each other except one with bearing shields and one without as a test.

 

[Czed]

pork loin round 2

 

[Woodpecker]

I wouldn’t mind seeing 2 saws built identical to each other except one with bearing shields and one without as a test.

Paging @Redbull661

 

[usmcbuckwild]

Paging @Redbull661

If i had a garage or a shop I would build the test beds myself, I have a couple 372 carcasses that I need to build anyways.

 

[p61 western]

Good day to burn.

 

[Cat 525]

Good day to burn.View attachment 216432

Tons of leaves around there. Do you worry about embers lasting a day or two?

 

[Stump Shot]

Tons of leaves around there. Do you worry about embers lasting a day or two?

Where's Smokey Bear when you need him?

 

[p61 western]

Tons of leaves around there. Do you worry about embers lasting a day or two?

Not really the leaves are so wet they put the fire out lol.

 

[Woodpecker]

From what others have posted and my own mental gymnastics the outer shield (with the slits in it) will help reduce amount of debris that is washed against the seal while still letting

If i had a garage or a shop I would build the test beds myself, I have a couple 372 carcasses that I need to build anyways.

 

[P.M.P.]

So where do I get these bearings from?
Shorenutz or showyoumynutz

 

[usmcbuckwild]

So where do I get these bearings from?
Shorenutz or showyoumynutz

showyoumynutz is a different kind of bearing, much much smaller in your case