Toilet syphon nut split issue

[MiguelPlumbelo]

Hi
I recently fitted a brand new Macdee syphon into a toilet and 4 weeks later it is broken at the nut which allows it to be serviced.

When pulling the handle to flush the toilet I did notice flex in the unit but not alot. Is this a common issue to happen with newer 2 part (serviceable syphons) as the one it replaced was one whole unit.

Picture attached

Thanks in advance to anyone willing to answer

 

[ShaunCorbs]

Was it located in the bottom key way so the force isn’t on the nut ?

 

[Ben-gee]

I don’t think it’s common.
Relationship between handle and syphon is important in terms of alignment and length of c-link, to ensure ease of use and lack of strain.

 

[MiguelPlumbelo]

Apologies for leaving it so late to reply to the above messages.

I messaged the supplier and got a refund of the syphon unit then purchased the same 10.5" syphon elsewhere and have installed it. This time I made sure to only tighten the coupling (service) nut tight enough so the syphon is functional as with the original I may have torqued it too much by hand.

The flex I originally described when pulling the handle moved the whole syphon at a diagonal and it required usually two pulls of the handle to flush. The handle was also much firmer with no play like there was with the original syphon setup. I do think this was due to the setup of the c link and arm as it was quite angled when I fitted the Macdee syphon. Although saying that the second toilet in the house the c link isn't perfectly straight and movement of the syphon unit occurs.

I've ordered a new toilet handle with a longer arm as the original doesn't stretch out quite far enough towards the syphon piston which the c link hooks onto. I also can't make adjustments to the red arm as too much limescale is on it (tried sanding it off) hence reason for new handle. I've attached 2 photos so you can see what I mean. Hopefully with the new handle and the c link setup more perpendicular there is less strain on the unit and it flushes first time with little force on the handle.

Regards