Author Topic: Husqvarna 350 bearing holder screws stripped.  (Read 559 times)

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Offline jon1270

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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? 

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Offline aclarke

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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

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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.

Offline jmester

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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.
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Offline Nathaniel Vansickle

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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.
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Offline 660magnum

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Re: Husqvarna 350 bearing holder screws stripped.
« Reply #5 on: August 25, 2014, 06:49:05 pm »
+1
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Offline weimedog

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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.

 

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