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Thread: Using retaining compound on the FM4008 motor's shaft

  1. #1
    Do NOT disturb the pilot saucisse's Avatar
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    Using retaining compound on the FM4008 motor's shaft

    As much as I like these motors, for the life of me I just don't know why they are using a ''loose'' shaft and set screw instead of a ''pressed in''shaft and setcrew. On these motors, after a crash I the setscrew would come loose even if some threadlocking was use so decided to do something about it: Retaining compound !

    Loctite 620 or Permatex 62041 (that is the one I'm using) will do the job.



    Simply remove the retaining clip ans setscrew:





    Disassemble the rotor from the stator:



    Remove the shaft from the can, clean it with a degreasing solvent, also clean the hole of the can:



    Apply some retaining compound one both the shaft and inside the can's hole:



    Put back the shaft in the can in a turning motion and let it cure for 24 hours. Be sure to wipe off any excess of compound:



    Once cured assemble back and re install the retaining clip and setscrew.



    The setscrew problem/loose shaft in the can is now a thing of the past. After only 4 hours the product is hardened, tried to turn the shaft in the can with a big plier without any luck... on the packaging there is a note saying that you'll need to use a puller or a press to separate the bonded parts lol
    Now go fly !!
    Last edited by saucisse; 23rd October 2012 at 10:44 PM.
    Long range FPV is so 2009

  2. #2
    Thank you for this. I'm doing this right now. I might ask questions later

  3. #3
    legend in my own mind radicalron's Avatar
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    Would this product work to secure my new boca-bearings in the motor?
    KJ6PQH So far the only mark I 've made in life, is the one in my underwear .

  4. #4
    Lumenier.com timnilson's Avatar
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    Quote Originally Posted by radicalron View Post
    Would this product work to secure my new boca-bearings in the motor?
    Yes it would.

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