Installing prop for the first time?

[555nova]

So I sent my prop off to be repaired over the winter and I am trying to reinstall it. I was following the instructions from the owners manual but when I install the castle nut I can't get the cotter pin to line up unless I back the nut off about one face. Am I doing something wrong or does e castle nut not need to be tight? The owners manual says to tighten it with a wrench, but I can't keep the prop from spinning

Thanks Jason

[TxHr]

You can insert a 2x4 or 4x4 between the prop and hull to hold the prop while you torque the nut. Make sure you first install the prop w/o the key and mark the shaft. You will need to reinsert the key and seat the prop to the same line. Once you have done this you can then install/torque the castle nut and install a fresh cotter pin.

[TRBenj]

It is permissible to back off on the castle nut after torquing it down, in order to get the cotter pin on. The taper is what holds the prop on- the castle nut and cotter pin are there as fail safes.

I would recommend lapping the prop on to ensure you have a good fit between the prop and shaft.

[AirTool]

Ditto on the lapping. Be sure to use FINE not the coarse compound.

Also, I disagree on blocking with lumber. If you are not using a torque wrench, put leather gloves on and hold the prop with your hand. Using a wrench or ratchet that is about a foot long is all you need. I can't remember the torque spec but it is relatively low. If you blocked the prop and get on it with the prop wrench, the nut is too tight.