[C320-list] Castle prop nut loose.

[Jeff Hare]

When we pulled our bronze shaft and replaced it with SS, the bronze shaft
had a bronze keyway.  If you feel you have to use a SS Keyway in a bronze
shaft, be sure to apply lots of TefGel anti-seizing grease or else you can
be pretty sure, it'll corroded itself in place.  Even with TefGel, you might
have a problem if you leave it for many years.  

I'd be less concerned about the keyway corroding to the shaft as I would be
it locking the prop in place.  If you can't get the prop off, you have to
drop the rudder to change out the prop shaft.   

So... I'd just buy the $2 Bronze keyway and save yourself a lot of grief.

Also, if there's room, you really *do* want that second thinner nut. Look it
up. I'd bet the main reason it wasn't on some people's boats is that their
marina did a poor job at commissioning this part, or they have a
folding/feathering prop without enough room.

-Jeff Hare

-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
Of Graeme Clark
Sent: Monday, February 22, 2016 4:51 AM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Castle prop nut loose.

Ted

Thats an interesting question - I think the key on mine is steel but I
haven't looked in detail. It's a bronze prop and shaft, of course, not
brass, which would rapidly galvanically corrode on it's own!

Graeme
#366 Jaskar, England

On 21 Feb 2016, at 18:36, tharrison at innovations-plus.com wrote:

> Sorry to jump in on this topic. Do you use a bass key on a bass shaft and
prop or is a steel key ok to use? 
> 
> If you use a steel key does it cause galvanic scaling and almost weld
itself in place?
> 
> Thanks
> 
> Ted Harrison
> Magic Moment (1997)
> Whitby Ontario
> 
> -----Original Message-----
> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On 
> Behalf Of Marek Fluder
> Sent: Saturday, February 20, 2016 7:48 AM
> To: C320-List at Catalina320.com
> Subject: Re: [C320-list] Castle prop nut loose.
> 
> Thank you Graeme and Joe for your input.
> As I have mentioned, because of previous discussions on similar topic
where air guns, PB Blaster and breaker bars were mentioned to loosen the
nut, I felt a little silly when touched mine and it was free...
> Joe - my conclusion from those discussions was that some of our boats 
> have
> 1 and some 2 prop nuts.
> Graeme - I have the same thoughts about forces exerted on the prop, but I
think vibrations might eventually loosen it up.
> I will attempt to tighten it up if positioning of the cotter pin opening
aligns with desired tightness.
> Thanks again.
> 
> Marek
> #1028, Lake Ontario
> 
> 
> 
> On Wed, Feb 17, 2016 at 3:03 PM, Graeme Clark <cg at skyflyer.co.uk> wrote:
> 
>> There is only one nut on mine!
>> 
>> I think you are worrying un-necessarily. When in forward gear the 
>> effect of the prop is that it pushes itself onto the shaft (it's 
>> pushing the entire boat forwards too!). I think the shaft is tapered 
>> as is the inside of the prop so the effect is to 'jam' the two together.
>> 
>> There is a limit to how far you can turn a castellated nut and still 
>> get the holes in the shaft to align with a slot in the castellations 
>> so it may not always be possible to get the nut really tight.
>> 
>> Only in reverse gear is there a risk of the prop sliding back. 
>> However there is a key in the shaft and prop hub so even if it does 
>> slide back it will not rotate. There is no circumstance where the 
>> split pin through the nut is transmitting the torque and might shear -
that just wont happen!
>> The pin is just to stop the nit rotating loose!
>> 
>> All in my humble opinion of course!!
>> 
>> Graeme
>> #366 Jaskar, Falmouth, UK
>> 
>> On 17 Feb 2016, at 19:46, Joe Abbagnaro <jabbagna at gmail.com> wrote:
>> 
>>> Hi Marek
>>> In the photo you can see on the shaft a place for a second pin to go
>> through indicating a second nut it has been a while since I have 
>> owned the
>> 320 but I am pretty sure you should have 2 nuts. Let's see what 
>> others have to say
>>> Joe
>>> 
>>> Sent From Mobile Device
>>> 
>>>> On Feb 17, 2016, at 2:11 PM, Marek Fluder <marekf at gmail.com> wrote:
>>>> 
>>>> Joe,
>>>> I have only one castle nut.
>>>> Here is the photo:
>>>> https://goo.gl/photos/ayW5YSYhw17DUzUJ6
>>>> 
>>>> Marek
>>>> #1028, Lake Ontario
>>>> 
>>>>> On Wed, Feb 17, 2016 at 1:54 PM, Joe Abbagnaro 
>>>>> <jabbagna at gmail.com>
>> wrote:
>>>>> 
>>>>> Yes you need to tighten that nut should not have any slack not 
>>>>> 100%
>> Sure
>>>>> but thought it was a double nut on the prop Joe
>>>>> 
>>>>> Sent From Mobile Device
>>>>> 
>>>>>> On Feb 17, 2016, at 10:48 AM, Marek Fluder <marekf at gmail.com> wrote:
>>>>>> 
>>>>>> After reading previous discussions about cutlass bearing 
>>>>>> replacement I
>>>>> was
>>>>>> looking at my prop and shaft yesterday.
>>>>>> Shaft play at cutlass bearing is about 0.4mm (1/64") so I do not
>> think it
>>>>>> needs replacement at this time.
>>>>>> I have found though that the castle nut is free (not tight 
>>>>>> against the
>>>>>> prop) being held by the cotter pin. Fixed 3 bladed prop seems to 
>>>>>> be
>>>>> solidly
>>>>>> jammed on the shaft.
>>>>>> Do I need to tighten the nut?
>>>>>> 
>>>>>> Marek
>>>>>> #1028, Lake Ontario
>>>>> 
>> 
>> -------------------
>> I work irregular hours and often write emails late in the evening and 
>> at weekends; that doesn't mean I expect you to do the same; reply 
>> when convenient!
>> 
>> 
>> 
>> 
>> 
>> 
> 

-------------------
I work irregular hours and often write emails late in the evening and at
weekends; that doesn't mean I expect you to do the same; reply when
convenient!