Plastimo jib furler

[jollyboy]

I am having problems with my Plastimo 809-S jib furler (SURELY NOT? I hear you say). It may simply be a sign of age (no, the age of the jib furler...) but it was becoming more and more difficult to furl and unfurl. Then a couple of months ago the castellated plastic nut unscrewed itself from the top swivel and the jib came down. Having screwed it back together again, it worked ok for a few weeks, but yesterday it came down again. Looking at the castellated nut, it's not clear to me if you are supposed to screw it down so far that the top of the threaded shaft onto which the nut screws is level with the top of the nut. I can't get it to screw that far down. Before it gets that far, I can feel the threads overriding each other. Does anyone have a view?
Also, it's not clear to me why the nut keeps coming off. I am simply screwing it down hand-tight, and there doesn't appear to be anything stopping it from coming loose again. Any ideas?

 

[billskip]

welcome jollyboy.

Cant say I can solve your problem, but a friends boat had same problem and we found that the bit of string that holds your rag up was tied in a way that caused the swivel to foul on the nut and every time he unwound/wound the rag it unscrewd/screwed the nut

 

[dukes4monny]

I am having problems with my Plastimo 809-S jib furler (SURELY NOT? I hear you say). It may simply be a sign of age (no, the age of the jib furler...) but it was becoming more and more difficult to furl and unfurl. Then a couple of months ago the castellated plastic nut unscrewed itself from the top swivel and the jib came down. Having screwed it back together again, it worked ok for a few weeks, but yesterday it came down again. Looking at the castellated nut, it's not clear to me if you are supposed to screw it down so far that the top of the threaded shaft onto which the nut screws is level with the top of the nut. I can't get it to screw that far down. Before it gets that far, I can feel the threads overriding each other. Does anyone have a view?
Also, it's not clear to me why the nut keeps coming off. I am simply screwing it down hand-tight, and there doesn't appear to be anything stopping it from coming loose again. Any ideas?

I know fom personal experience that if you have the cranked shackle attached the wrong way around it will unscrew the top nut when you unfurl the genoa............mine does have a sticker on the nut showing how it should be done!
I cannot answer your specific question about how far it should screw in, I just screwed mine back together and turned the shackle around and it's been up there ever since.
According to the Plastimo manual, the halyard to forestay angle should not exceed 25 degrees, have you checked this?
Also make sure that the forestay and the halyard are tight........

 

[mainmarine]

The balls in the top swivel may have jumped making it impossible to screw the nut all the way down, check they are all level before you screw it back on, could you use some thread lock/sealant, to stop it coming undone again if turning the shackle doesn't stop it.

 

[VicS]

Make sure you are using the correct bent shackle for the halyard.

photo from Searush:

What can happen, courtesy of Refueller, if an ordinary shackle is used:

 

[jollyboy]

Plastimo Furler

Many thanks to all! The angle of dangle is clearly the important thing. I'll see what happens this weekend.

Thanks Guys!