Troublesome clutch

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  #1  
Old 04-24-02, 04:58 PM
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Troublesome clutch

Hello, I have been in the process of repairing a Stihl weedwacker Model FS36 for a friend over the last few weeks in my spare time.It had multiple problems to overcome- weak spark,(replaced the coil) couldn't adjust the carb.(needle valve stuck open).I've now got it about where I want it to be except for one pesky problem- I can't keep the clutch on the crankshaft.It appears to me that it should tighten up against the rotation of the crank but no matter how tight I get it, it seems to loosen up and I hear that familiar tinging noise inside the motor after it runs a few minutes. I tried using some old loctite I found down cellar but it still did not hold. I picked up a little from the shop where I work which is a high strength bond loctite and I am going to give that a try. Any other ideas???????
 
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Old 04-24-02, 09:31 PM
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I don't recall what type clutch is on that trimmer, and I have no Stihl books. However, some clutch sets can be screwed onto the shaft backwards...(wrong side out). Is it possible that's what has happened? High strength locktite should work if you tighten it up well, but it will make removal more difficult next time. Maybe someone else will respond and shed more light on the subject.
 
  #3  
Old 04-25-02, 03:00 PM
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I am pretty sure its on the right way because it says "off" on the side that faces me as I look at it. Yes I know what you mean about difficult removal...We usually have get the temp. up to around 300* F. to get it to release. I know it works real well on bearing fits on shafts where the clearance is less than 0.015 of an inch..... It was real tight when I took it off originally. I actually chipped a small piece out of it to get it to start off the shaft. Maybe I'll have to put a length of rope into the spark plug hole to stop the piston from moving and really come on to this one to get it tight enough........
 
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Old 04-25-02, 07:00 PM
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I wouldn't try that with the rope. The connecting rods on small engines like that are not very strong, and can bend under that kind of stress. I once saw a homelite that the cylinder got filled with gas and the piston couldn't compress it, so by the owner pulling on the cord, he bent the rod. Sounds like you have it on the right way though. Give the locktite a try and let us know how it goes!
 
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