Stihl 361 main bearings

[farmguywithasaw]

Working on my buddies 361. Hasn’t had any real maintenance in a while. So I pulled the clutch drum off and I noticed there is a very small amount of wiggle only on the pto side. Is there a spec for how much is allowed or is it time for new bearings. Also a service manual could be helpful thanks JP

 

[chainsaw-57]

Check that bearing is not loose in crankcase pocket.

Pressure test saw, bubbles around outside of bearing, it is loose.

 

[nedsim]

This chart shows the radial clearance for deep groove bearings. C3 is the column you're interested in.
http://flt.krasnik.pl/images/Baza_wiedzy/EN/Internal_clearance.png

A drawing of internal clearance:
https://blog.emersonbearing.com/hubfs/unnamed.jpg?t=1534446719883#keepProtocol

Dunno the exact size of your bearing, but it has to be in the first 2 rows of the table, so the max clearance would be 28um, or .0011 inch. If the shaft rattles much more than a thousandth, you should probably investigate further.

 

[farmguywithasaw]

This chart shows the radial clearance for deep groove bearings. C3 is the column you're interested in.
http://flt.krasnik.pl/images/Baza_wiedzy/EN/Internal_clearance.png

A drawing of internal clearance:
https://blog.emersonbearing.com/hubfs/unnamed.jpg?t=1534446719883#keepProtocol

Dunno the exact size of your bearing, but it has to be in the first 2 rows of the table, so the max clearance would be 28um, or .0011 inch. If the shaft rattles much more than a thousandth, you should probably investigate further.

Yeah it’s mor like 5 to ten thousands I’ll pull the oil pump and the crank seal to see we’re the play is

 

[huskihl]

On any of them I’ve seen, if you can feel it or see it move, it’s bad. Remove everything so you can take a look and see if it’s moving within the bearing or if the case is wallowed out and the outside race is moving

 

[farmguywithasaw]

I talked to my buddy I’m gonna replace the main bearings. Crank feels really good stihl, now he wants me to port it too lol

 

[farmguywithasaw]

Is this a pretty common problem on these stihls?
View attachment IMG_2022.mov

 

[huskihl]

Is this a pretty common problem on these stihls?
View attachment 1226499

Only if it’s tuned too lean or not running enough oil. Don’t see many bearings going bad at all in stihl saws

 

[farmguywithasaw]

Well I have to say it went together quite well. I found if you stated the case half bolts it held the gasket and the half’s from flopping around. Husqvarna 365/372 tool works on the flywheel side. I have the Stihl style one for the pto side
View attachment IMG_2027.mov