scorched stihl 046 complete rebuild. w/ pic's

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matt9923

matt9923

Stihl bustin knuckles
Joined
Dec 17, 2008
Messages
4,330
Location
CT
Got my parts, got the crankcase back together but its not spinning free. Not sure what wrong with it, i tapped both ends and its still not spinning good. back the screws out and it spins fine, I'm pretty sure I got everything in straight... haven't had this munch trouble before.

any ideas?
 
matt9923

matt9923

Stihl bustin knuckles
Joined
Dec 17, 2008
Messages
4,330
Location
CT
Well I'm done with it for tonight. Here's some pictures

CIMG1924.jpg


CIMG1926.jpg


CIMG1927.jpg


CIMG1928.jpg


CIMG1929.jpg


CIMG1930.jpg




Anyone else having problems getting on Google?
 
matt9923

matt9923

Stihl bustin knuckles
Joined
Dec 17, 2008
Messages
4,330
Location
CT
I heated the case half's to 300 degree for 20 min, pressed the bearings in, pulled the crank onto the clutch side and pulled the flywheel side on. The dowels are in.

I managed to grub the nice case up and lose a few parts under the bench..... guess its not my night.
 
matt9923

matt9923

Stihl bustin knuckles
Joined
Dec 17, 2008
Messages
4,330
Location
CT
Beside heating up the crankcase, you could have put the bearings in the freezer (-20ºC) to shrink them a bit. It could have help you press them in the crank case.

The flywheel drooped in and the clutch i pressed in, that was the easy part. Ill pull it apart again and see whats wrong....
 
Saw Dr.

Saw Dr.

Junk Collector
Joined
Oct 20, 2007
Messages
5,986
Location
Temple, GA
The flywheel drooped in and the clutch i pressed in, that was the easy part. Ill pull it apart again and see whats wrong....

DO NOT PULL IT BACK APART!!!

You did everything right. "tapping" the crank won't do crap. You need to give it a couple of good swats on either end with a brass hammer. It will free up. It is a chainsaw, not a rolex. Those parts are interference fit. I'm not saying to mushroom the end of the crank from beating on it, but it will take some smart, sharp blows. You'll know when it is right.
 
matt9923

matt9923

Stihl bustin knuckles
Joined
Dec 17, 2008
Messages
4,330
Location
CT
DO NOT PULL IT BACK APART!!!

You did everything right. "tapping" the crank won't do crap. You need to give it a couple of good swats on either end with a brass hammer. It will free up. It is a chainsaw, not a rolex. Those parts are interference fit. I'm not saying to mushroom the end of the crank from beating on it, but it will take some smart, sharp blows. You'll know when it is right.

worked perfect, a couple taps not even hard an its spinning good. Thanks
 
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