[C320-list] Castle prop nut loose.

[Graeme Clark]

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 
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>> 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!