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