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Offline 3000 FPS

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Re: ms290
« Reply #10 on: February 22, 2014, 08:51:44 pm »
Well I learned something, I did not know that about the Bearings having plastic races.
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Offline 660magnum

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Re: ms290
« Reply #11 on: February 22, 2014, 09:02:41 pm »
I never seen a plastic race in a ball bearing but have seen a lot of ball bearings with plastic cages. I'd rather have the plastic cage.
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Offline 3000 FPS

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Re: ms290
« Reply #12 on: February 22, 2014, 09:07:26 pm »
Quote from: 660magnum on February 22, 2014, 09:02:41 pm
I never seen a plastic race in a ball bearing but have seen a lot of ball bearings with plastic cages. I'd rather have the plastic cage.

Yes that would make more sense for it to have a plastic cage not a race.   Don't some of the huskys suffer from the same thing.
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Offline tinkerswithengines

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Re: ms290
« Reply #13 on: February 22, 2014, 09:16:34 pm »
OOOPS! Sorry!!!! My terminology was wrong. Meant to say plastic cages rather than races. Either way....plastic or whatever that material Stihl has used in the manufacturer of their (made in India bearings) has no place in a bearing....my opinion. Then again....running a chain too tight is lack of good common sence of the orginal owners part. In this case....my gain! ;D


Dave
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Offline 660magnum

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Re: ms290
« Reply #14 on: February 22, 2014, 09:28:06 pm »
A ball bearing run at very high speed is going to loose the cage before anything else.

In a two stroke, whatever comes off the bearing goes up through the engine. The Melmide in theory doesn't hurt anything. But I put new rings in after loosing a plastic cage.

When you start to loose the cage, you will never know it unless a piece of the metal cage start tearing up the piston.

With the plastic cages, the saw may run OK for a while but will suddenly stop when all the balls get on one side and the crank hits the crankcase.
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Offline 3000 FPS

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Re: ms290
« Reply #15 on: February 22, 2014, 09:46:19 pm »
If I had my choice it would be metal all the way.
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Offline tinkerswithengines

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Re: ms290
« Reply #16 on: February 22, 2014, 10:00:40 pm »
The MS290 Farmboss I worked on, or rather rebuilt today today had its clutch side crank bearing worn to the point you could hear the "roughness" for lack of a better term when just pulling the starter "rope" however....all of the ball bearings were still within the "plastic" cage. The "slop" of the worn cage of the crank shaft bearing caused the seal to leak..... causing a "lean" condition ...end result...scored piston and cylinder.
Sure, the owner of the saw was probably at fault at some point of operation of the saw causing this falure but I wonder if the crank shaft bearing cage had been made of "steel" rather than the plastic fiber, if the saw would have served the user better or better stated....longer life of the saw in GENERAL even under proper use? In my opinion.....look....I am a number "1" fan of Stihl products...especially their saws but their "quality" is lacking in the use of plastic cages in the crankshaft bearings on the 029, MS 290, MS 310 etc. saws.
You tube has several videos on Stihl's plastic crank shaft cage failures of the above named models...not just my findings.

Dave

   
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Offline 3000 FPS

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Re: ms290
« Reply #17 on: February 22, 2014, 10:31:03 pm »
Quote from: tinkerswithengines on February 22, 2014, 10:00:40 pm
The MS290 Farmboss I worked on, or rather rebuilt today today had its clutch side crank bearing worn to the point you could hear the "roughness" for lack of a better term when just pulling the starter "rope" however....all of the ball bearings were still within the "plastic" cage. The "slop" of the worn cage of the crank shaft bearing caused the seal to leak..... causing a "lean" condition ...end result...scored piston and cylinder.
Sure, the owner of the saw was probably at fault at some point of operation of the saw causing this falure but I wonder if the crank shaft bearing cage had been made of "steel" rather than the plastic fiber, if the saw would have served the user better or better stated....longer life of the saw in GENERAL even under proper use? In my opinion.....look....I am a number "1" fan of Stihl products...especially their saws but their "quality" is lacking in the use of plastic cages in the crankshaft bearings on the 029, MS 290, MS 310 etc. saws.
You tube has several videos on Stihl's plastic crank shaft cage failures of the above named models...not just my findings.

Dave

   

No one is doubting your findings, just some pros and cons being offered which is good discussion and informational.
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Offline Cut4fun .

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Re: ms290
« Reply #18 on: February 22, 2014, 11:53:32 pm »
The new 365 XT and 372xp XT have plastic cages now I am told.
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Offline roostersgt

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Re: ms290
« Reply #19 on: February 23, 2014, 12:23:03 am »
I've read this before and have no reason to doubt it. The crankshaft bearings in the 1127 series of saws (290/310/390) are the exact same crankshaft bearings Stihl uses in its really really big and powerful saws, like the 075/070 and 090 series of saws. I may be mistaken,but I doubt the bearings are any cause for concern. The picture of the OEM Stihl bearing has "Germany" printed on it. Here's a great picture of an OEM "290" bearing captured ofF Ebay moments ago. Any chance the saw you worked on had AM parts on it instead of OEM?

http://www.ebay.com/itm/NEW-OEM-STIHL-Chainsaw-Crank-Shaft-Bearing-029-039-038-075-090G-MS-290-310-390-/350837041910?pt=LH_DefaultDomain_0&hash=item51af846af6
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