Chainsaw Repair
Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Stihl => Topic started by: aclarke on August 09, 2015, 11:40:48 pm
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Rebuilding an old small pin 044 and noticed the crank bearings have metal shields on the inside, kinda odd. Anybody seen this?
[img http://(http://i1184.photobucket.com/albums/z329/Aclarke123/20150809_193158_zps36fe6e0d.jpg) (http://s1184.photobucket.com/user/Aclarke123/media/20150809_193158_zps36fe6e0d.jpg.html)/img]
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Jacob J mentioned those. I think there was a service bulletin way back to replace them.
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Interesting! Thanks
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So stihl tried running shields inside at one time. So they were packed in grease? No mix getting through for lubing.
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Nice. Learn something everyday.
Sent from my iPhone using Tapatalk
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Don't know if they were factory greased, be interesting to know.
This this saw had both seals pulled when I got it , so I suspect it had a seal issue that was never fixed. Bearings are still smooth. Gonna pull the metal bearing seals and put new Stihl seals on the crank.
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Called the local stihl dealer to check prices on pto bearing for the 44 and to my surprise they're only $15. Seem to remember these being in the $40 range?
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Stihl parts have dropped considerably. My dealer said it was to compete with aftermarket so less people would rebuild them with China junk that don't last and they get a bad rap for stihl. It used to be $100 for bearings and seals and now it's about $60.
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Jacob J mentioned those. I think there was a service bulletin way back to replace them.
Yes I remember that service bulletin around late 1989. I should have it in a binder I kept from when I worked for Stihl Canada back then.
If memory serves me correct the bearings were packed with same Stihl grease used for brush cutters heads and clutch drum bearing and bar nose grease guns.
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Very interesting! Seems like it could be a good system with a high quality modern lubricant. Thanks
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Side note/question: The 044 uses a spacer that the crank seal lip rides on and clutch assembly is spaced away from crank with. The fit of the spacer is a loose press fit and I'm wondering if the tension of the clutch pushing the spacer against the crank shoulder is sufficient to seal or should I use a retaining compound on the spacer.
service bulletin info on this?
Also, can't see the spacer on any new/old IPLs
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[img http://(http://i1184.photobucket.com/albums/z329/Aclarke123/20150813_212310_zps884701bf.jpg) (http://s1184.photobucket.com/user/Aclarke123/media/20150813_212310_zps884701bf.jpg.html)/img]
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the bearings were shielded, not sealed. didn't work to good.
put a little grease between the shaft and bushing.
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Rebuilding an old small pin 044 and noticed the crank bearings have metal shields on the inside, kinda odd. Anybody seen this?
[img http://(http://i1184.photobucket.com/albums/z329/Aclarke123/20150809_193158_zps36fe6e0d.jpg) (http://s1184.photobucket.com/user/Aclarke123/media/20150809_193158_zps36fe6e0d.jpg.html)/img]
Yeah the pic didn't look right when I first saw it on my phone, should have zoomed it in.
Definitely not a sealed bearing . I looked for the 044 service bulletin no luck might find it in another pile of boxes. Trouble with not having Internet back in the day. Probably was the upgrade away from the shielded bearings.
Can't remember which saw had the sealed bearing at one time......064?
I remember my old Jonsereds having them.
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I little known secret concerning high speed precision bearings.
When they set up same they remove the seals,wash all the original grease out and then pack the bearng with high speed grease .--then believe or not they use compressed air and blow out the excess .Then replace the seals .
It seems to go like this .What ever the small amount the balls can carry,just a slight film ,is all the bearing needs .Any more than that s detrimental .Sounds crazy but that's the way it's done .
Grease as we know it in reality is just oil with a thickening agent .
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Al, very interesting.
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We had a furnace with a roller conveyor traveling through it. Ran about 1550 F.
Shut it down for PM and greased all the bearings on the roller ends outside the furnace. On start up, the conveyor motor wouldn't pull the conveyor because of all the grease in the bearings. We had to install a bigger driver & servo motor. After the grease pushed outside the seals, it pulled OK.