goeasy123
Well-Known Member
Does anyone know the manufacturer of this prop shaft coupling and how to get it off the end of the prop shaft?
It's on a Najad 400.
It's on a Najad 400.
Prop Shaft Problem
- Thread starter goeasy123
- Start date
Tranona
Well-Known Member
Looks like a Vetus Uniflex as here vetus.com/en/stern-gear-systems/flexible-couplings/sprzeglo-uniflex-16-8171.html You can download the instructions from that link.
ean_p
Well-Known Member
It looks like you need to use 3 'jacking' screws to push the coupling off the tapered bush. The screws are inserted in the face that has the larger overall diameter ( not the face you show) as per the drawing in the manual.
Boater Sam
Well-Known Member
Its a Centraflex coupling and yes, use 3 jack screws in the deeper holes to release the taper fit.
jwfrary
Well-Known Member
The jacking holes are on the shaft side of the coupling.
goeasy123
Well-Known Member
Thanks all.
It's a challenge to put back together. The clamping cone and its seat are stepped. So while the coupling is only a few inches think the effective cone length must be at least 12 inches. It needs to be torqued to 79NM, which you have to do repeatedly as the cone settles in the seat. You need a long lever to apply 79NM and there ain't much room in the engine room to do that. ....took me over an hour and a bit of boat yoga to fit 6 bolts!
It's a challenge to put back together. The clamping cone and its seat are stepped. So while the coupling is only a few inches think the effective cone length must be at least 12 inches. It needs to be torqued to 79NM, which you have to do repeatedly as the cone settles in the seat. You need a long lever to apply 79NM and there ain't much room in the engine room to do that. ....took me over an hour and a bit of boat yoga to fit 6 bolts!
captainboo
Well-Known Member
That's less than most car wheel nuts require. My coupling requires 294Nm - far more fun in a confined area!
Poignard
Well-Known Member
If I remember correctly, Centaflex recommended that a special grease should be used on the conical faces.