Bearing Sludge

[PES+]

Yes.. and I often use an otoscope when assembled to look in the races for galling and other problems.

The shop even has a cool little tool to remove the bearing races from a saw (not all saws..) without spitting the crankcase....

I think you meant the cages?

I'd like a tool that I could pull the races out without splitting the cases

 

[ShoerFast]

explain how it causes centralized heating. I do not understand

As I am sure that you do, I just don't articulate well.

Say a saw is ran with the shutter set for summer, in a cold damp environment,,,,, sort of like ,,like , oh, you could think of a State?

And the humidity that the saw ingest hits low-pressure cavities in the saw, like behind the balls in the bearings, that water would drop out, mix with the oil and lower the plating ability or film quality.

Brake down the oil, and the balls can heat up, at the exact spot of the film brake-down. That brake down can make varnish, sludge if mixed with water, or plasticized gunk. , (if this explains it?

 

[PES+]

As I am sure that you do, I just don't articulate well.

Say a saw is ran with the shutter set for summer, in a cold damp environment,,,,, sort of like ,,like , oh, you could think of a State?

And the humidity that the saw ingest hits low-pressure cavities in the saw, like behind the balls in the bearings, that water would drop out, mix with the oil and lower the plating ability or film quality.

Brake down the oil, and the balls can heat up, at the exact spot of the film brake-down. That brake down can make varnish, sludge if mixed with water, or plasticized gunk. , (if this explains it?

sounds like a possiblity

 

[Lakeside53]

if you are getting blow by then generally your piston is worn bad. Lake, do you see a lot of brittle cages from heat. I run into it quite often.

I'm not sure it's just heat. I think it's gas additives... (no scientific data). I've seen sevaral broken cages on 026/036 saws (and Br400/420) that the only thing that was wrong was the cage. Heat alone won't make nylon brittle, so my theory on the gas..

I've flushed many saws, but I have concerns that I'm also pushing crap past the bearing so it gets stuck between the seal and the bearing, and will come out later. I'm much happier when I flush with the seals out.

As for cleaning bearings.. I have a couple of ultrasonic cleaners - they really do an excellent job of removing junk.. One I can fit the entire crankcase in..

 

[Lakeside53]

I think you meant the cages?

I'd like a tool that I could pull the races out without splitting the cases

Nope, the races... to pull the bearing. You break the cage, move the balls, insert the tool, crank it open and it works like a puller...

 

[Lakeside53]

We do get some strange smelling gas up here and it varies
none of it is labelled gasahol or ethanol beld but most of it smells like alky especially the premium

Our Shell gas out here smells like it has kerosene in it..

 

[PES+]

Nope, the races... to pull the bearing. You break the cage, move the balls, insert the tool, crank it open and it works like a puller...

Huh?

how do you get the outer races out?

 

[Lakeside53]

It has two ends on it like a 1/4 inch ball, and when rotated grabs both races. Obviously it only works on saws that can have the bearing pulled out. I've never used it... but I'll try to take a picture on Thursday

 

[PES+]

I know the tool you are talking about

I have one somewhere

Maybe you can show me how it works I have never been able to pull those bearings through that little seal hole.:bang:

 

[bwalker]

Heat alone won't make nylon brittle, so my theory on the gas..

When I worked in the auto industry we got some parts back that failed in the field. They where nylon and came from Brazil. Now, nylon is supposed to be impervious to ethanol and fuel, but there was something in the fuel that was causing it to break down.
We never did find the cause.

 

[spacemule]

]
I would however suggest any one who rebuilds their top end; while you have it off; you might want to use some good parts cleaner or brake clean and wash out their bearings before installing a new top end. Pour it into the case and soak them for a while and then rotate you crank.

Won't parts cleaner eat the seals out of the bearings?

 

[klickitatsacket]

Won't parts cleaner eat the seals out of the bearings?

Pearl, D-3 and brake clean all work fine with out hurting seals. You do still need to check what ever you are using.

 

[B_Turner]

I'm not saying that it is necessarily relevant here, but the original posts noticing the bearing sludge reminds me of how in the past when MRI imaging got really good, docs started seeing all kind of spine problems that they tried to do surgury to correct. With statistically poor results.

After a number of years went by, they realized that often what they thought were serious problems occurred very commonly in people with no symptons/problems in their whole lives. So now surgeons are not as quick to start cutting based on MRI "anomolies."

Ah, the blessing of bleeding edge technology.