Author Topic: Check Valve poulan micro saws  (Read 1080 times)

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Offline 3000 FPS

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Re: Check Valve poulan micro saws
« Reply #10 on: May 13, 2015, 10:30:34 pm »
Update:
I finally got it apart and re-assembled. My bushing was steel not brass. Must have been an earlier version. I filed the crimp off (I don't think it would have helped having it anyway). Used my propane torch to heat up the outside a little, while also using the short leg of a allen wrench that fit in the hole to pry up. Popped up easy then.
Cleaned it all up w/brake cleaner. Inserted the new duck bill and put a little RED Loctite on both mating parts and tapped the bushing tight with a drift pin. 
The only messy part was putting the screen back on with JB weld. When/if I do another one, I'll put the JB Weld around the perimeter of the valve body, and push the screen into it.

I hope this helps anyone else wanting to re-build the check valve. After you've done one, you see what works and what don't, it's really easy. I got the duckbills from my Husky dealer for $1.49 each.

Thanks for the report.  Good job.
PP 505, 475, 445.

Offline Al Smith

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Re: Check Valve poulan micro saws
« Reply #11 on: May 14, 2015, 05:14:52 am »
Good info .I never did know how those things oiled .

I've only got one,an early 1.9 cube with that system .Plus it has a thumb button .Neat little saw .It was my climber before I got the 200T Stihls .

Offline ChipsAhoy

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Re: Check Valve poulan micro saws
« Reply #12 on: December 20, 2016, 09:59:09 pm »
Just an update to my previous post.
I've done several of these now, and have found that a just a very small touch of Aviation Permatex to the duckbill side shoulder when installing it will guarantee a airtight fit. I like to tap the bushing snug but not so tight that I may mess up the small shoulder. After rebuilding one I still didn't have the proper sealing when testing it. I took it apart and added the Permatex, reassembled it and problem solved. I did let it cure over nite before installing it.

I think the screen is more safety net to contain the check valve part/parts if they fail, from having direct access to the crankcase then being a filter.
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Offline Cut4fun .

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Re: Check Valve poulan micro saws
« Reply #13 on: May 09, 2018, 09:06:59 am »
@Todd Loosli   a member here and as has them FS too.   18 shipped. 

Just wanted to save a poulan check valve he made before it gets buried and lost.


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Offline ChipsAhoy

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Re: Check Valve poulan micro saws
« Reply #14 on: May 09, 2018, 04:01:34 pm »
Fantastic, that is ingenious.  8)
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Offline Eccentric

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Re: Check Valve poulan micro saws
« Reply #15 on: May 10, 2018, 05:07:05 pm »
Cool.  I'd much rather pay him $18 for a newly made check valve assy (with a fresh new duckbill within) than pay an eBay parts scalper $30+ for an NOS valve that might well decay and fail shortly after instalation.
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.
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