Viscous coupling

[timshap]

Just fitting a new coupling...when tightened onto the pulley the whole coupling sits in or almost touching the pulley behind and can turn roughly...is this correct?
When fixing the fan blades onto the coupling they seem to touch the other pulleys so too far back and I am wondering if I am missing a spacer where the main bolt goes through?.

Any views welcome.

 

[Trickythemerc]

Have a good look at the old coupling and see if any spacers or distance pieces are stuck to it. Check the measurements against the old one they may be different.