Author Topic: Husqvarna 350 bearing holder screws stripped.  (Read 216 times)

0 Members and 0 Guests are viewing this topic.

Offline jon1270

  • 3 cube
  • *
  • Posts: 12
  • Karma: 0
Husqvarna 350 bearing holder screws stripped.
« on: August 25, 2014, 03:29:21 pm »
This is the only clamshell-ish saw I've worked on, so I'm not feeling too confident with this problem I've run into.  I have been attempting to rebuild a Husky 350 that developed an air leak between the aluminum bearing holder and the plastic crankcase because one of the screws loosened and fell out.  The bottom holes in bearing holder are not tapped for machine screws on these saws; the screw threads are sharp, and they just bite into the aluminum casting.  I cleaned it all up and put it back together with the appropriate sealant, which went swimmingly until I put my torque wrench on it to tighten it to spec.  Two of the four screws stripped out of the casting before reaching the low end of the specified torque range.  So, the casting is toast and now I'm worried I'll ruin the replacement I just ordered.  In retrospect it's not too surprising that this might happen; every time these screws are removed and replaced, they could cut new threads into the casting instead of slipping into the old ones, and that would quickly weaken the holes.  Can anyone advise me how not to repeat this little disaster? 

Share on Facebook Share on Twitter


Offline aclarke

  • Nitro Hotsaw
  • *******
  • Posts: 1676
  • Karma: 172
Re: Husqvarna 350 bearing holder screws stripped.
« Reply #1 on: August 25, 2014, 04:10:12 pm »
Should be a fee different sizes of those self tapping screws.  I've used some of the larger Stihl screws where the small Husky type has stripped.  Alternately you could drill and tap to use conventional m5, m6 , space permitting...

Offline JohnG28

  • Piped Saw
  • *****
  • Posts: 315
  • Karma: 27
Re: Husqvarna 350 bearing holder screws stripped.
« Reply #2 on: August 25, 2014, 05:27:06 pm »
Yeah I'd try a larger screw before trying new parts. Worst case you are where you are now.

Online jmester

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 2066
  • Karma: 158
  • Location: MD
Re: Husqvarna 350 bearing holder screws stripped.
« Reply #3 on: August 25, 2014, 06:28:09 pm »
It is hard to say what condition the threads where in before you started. With one screw all the out it puts a different load on the others. Once you get the other riser. Take your time and make sure the screws are started right. Remember it is just mag or aluminum so won't take much to mess up a thread.
FEAR NO TREE. FEAR GOD.

Offline Nathaniel Vansickle

  • Piped Saw
  • *****
  • Posts: 468
  • Karma: 92
  • Location: Newcomerstown ,Ohio
Re: Husqvarna 350 bearing holder screws stripped.
« Reply #4 on: August 25, 2014, 06:47:37 pm »
haven't ran into this problem yet but on recoil screws and such in aluminum or mag I use time-serts. work great and haven't had a single one come back yet. they are expensive though. each insert is about $3 plus an $70 tool set to install them.
5105H and 6400H in stock

Performance Outdoor Equipment
performanceoutdoorequipment.com
Dolmar, Echo, Jonsered


Offline 660magnum

  • Global Moderator
  • Nitro Hotsaw
  • *******
  • Posts: 6437
  • Karma: 249
  • For The Love Of Chainsaws
  • Location: NCO
Re: Husqvarna 350 bearing holder screws stripped.
« Reply #5 on: August 25, 2014, 06:49:05 pm »
+1
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline weimedog

  • 6 cube
  • ****
  • Posts: 260
  • Karma: 57
Re: Husqvarna 350 bearing holder screws stripped.
« Reply #6 on: August 27, 2014, 10:07:06 am »
Huztl....:) Or convert them over with heli-coils . All four. NOT a disaster! Either an opportunity to learn some shop skills, ie. Heli-Coil's OR learn about cheap aftermarket parts! Both are either a PITA or lots of fun depending on the mind set & real time needs.

 

Related Topics

  Subject / Started by Replies Last post
9 Replies
928 Views
Last post December 09, 2011, 06:36:47 pm
by Al Smith
6 Replies
273 Views
Last post October 14, 2013, 06:29:37 pm
by Cut4fun .
3 Replies
248 Views
Last post April 29, 2013, 12:34:45 am
by 3000 FPS
2 Replies
106 Views
Last post August 17, 2013, 01:19:00 pm
by Cut4fun .
4 Replies
676 Views
Last post November 28, 2013, 08:16:36 pm
by Jd2007
1 Replies
130 Views
Last post February 06, 2014, 08:52:17 pm
by KilliansRedLeo
11 Replies
222 Views
Last post May 16, 2014, 08:01:40 am
by KilliansRedLeo
5 Replies
603 Views
Last post September 03, 2014, 11:53:37 pm
by 3000 FPS
7 Replies
356 Views
Last post February 17, 2015, 09:13:42 pm
by mcbob
2 Replies
117 Views
Last post April 14, 2015, 08:48:14 pm
by deereguy