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Geha 790 Piston Unscrews When Filling

geha 790

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2 replies to this topic

#1 OCArt



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Posted 16 September 2020 - 23:08

I have a Geha 790 with a tendency to unscrew the piston threads as I turn the filling knob counter-clockwise to lower the piston for filling. Even if I'm careful I can't always determine when the piston has reached the limit of travel to stop turning.


Can I apply rosin or some other substance to 'lock' the threads a bit tighter?


Thanks in advance,



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#2 Tweel



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Posted 17 September 2020 - 07:21

I had the same problem with a Pelikan M101N, and fixed it with Ron Zorn's (rosin-based?) thread sealant.  Just a tiny droplet melted on the tip of a toothpick with a heatgun did it.  (If you do the same thing, don't hold the heatgun too close to the toothpick or the sealant will blow right off when it melts. :D )

Edited by Tweel, 17 September 2020 - 07:23.

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#3 whych


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Posted 17 September 2020 - 10:49

Have you tried using a paper clip to tighten the piston outer housing into the body?

Usually this fixes the problem.

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