[C320-list] coupler re-install

[Kenny Geist]

Kenny Geist
Kennyge at Prodigy.net

619-895-3406 

-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
Of Rick Sulewski
Sent: Sunday, April 26, 2015 12:15 AM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] coupler re-install

Ted,
You're welcome!
Rick

-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf
Of tharrison at innovations-plus.com
Sent: Saturday, April 25, 2015 10:35 PM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] coupler re-install

Now installed!

Thanks for details.  Worked great. 

Ted 

Sent from my iPhone

> On Apr 25, 2015, at 12:46 PM, "Rick Sulewski" <rsulewski at bex.net> wrote:
> 
> Ted,
> I found that installing the coupler as you suggest works while being 
> certain to line up the coupler set screw holes with the shaft dimples 
> and then installing the set screws followed by taping in the key. That 
> arrangement worked better in my situation when I recently removed the 
> coupler to replace an aging 20 year old shaft log hose. I initially 
> attempted to install the coupler by installing the key in the shaft 
> and then driving the shaft into the coupler when that prop shaft 
> coupler was attached to the engine side coupler, using piece of wood 
> to prevent damage to the shaft threads with the prop installed, but 
> that approach did not work for my. The boat, while in its cradle, 
> naturally experiences a degree of hull flex and the shaft could not be 
> driven all of the way into the coupler even with a large degree of 
> tapping force at the prop end of the shaft because the shaft did not 
> totally line up when it was half way into the coupler. Further 
> movement was being held back by a portion of the leading edge of the 
> shaft resisting against the coupler due to the degree of  hull flex, 
> creating misalignment while resting in the cradle (causing increasing 
> amounts of excessive force necessary to continue to drive the shaft 
> into the shaft side coupler which I opted not to continue). I then had 
> to remove the partially installed shaft from the coupler with the 
> flange puller and reinstall the coupler by driving in the key from the 
> engine side after being certain the coupler set screws were seated 
> into the dimpled shaft in order to line up the key slots on the back 
> side of the shaft & coupler. After tapping in the key more than 
> halfway in,  I met with some resistance and then reinstalled the shaft 
> side coupler to the engine side coupler and then only had to tap  the 
> end of the prop shaft to further drive the key into the last portion 
> of
the coupler, followed by separating the coupler for additional taps on the
key leaving the key almost flush with the face of inside edge of the
coupler.
> 
> It is important to understand that the coupler should be tightly fit 
> on the shaft and the key helps to not only keep the shaft from 
> rotating within the coupler, but also serves in my case to fit very 
> snugly between the shaft & coupler. If the shaft to coupler fit is too 
> loose, then the shaft could work loose (wobble) within the coupler and 
> that could result in the shaft separating from the coupler if the 
> shaft side of the set screws shear off when operating suddenly in 
> reverse or under strong power in reverse. That is why it is not 
> advisable to grease or lubricate the shaft when reinstalling the shaft 
> in the coupler because the rust that naturally develops between the 
> shaft and coupler serves to also provide a tighter tolerance over time 
> between the shaft and coupler. Do not forget to tightly wired the set
screws to prevent them from working loose.
> 
> As an additional precaution it is advisable to have your prop zinc 
> located securely just ahead of your prop strut by a length not greater 
> than exists between the coupler and packing log nut in the event the 
> prop shaft may ever separate from its coupler with the intent of 
> relying on the shaft zinc to
> (hopefully) keep the shaft from totally exiting/departing beyond the 
> packing log nut and creating a large flow of water to overwhelm the 
> bilge
pump.
> 
> Hope this reply is clear. If not, feel free to contact me off line at 
> my email address.
> Rick 95 320 hull #277
> 
> -----Original Message-----
> From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On 
> Behalf Of tharrison at innovations-plus.com
> Sent: Saturday, April 25, 2015 10:45 AM
> To: C320-List at Catalina320.com
> Subject: [C320-list] coupler re-install
> 
> Do you put the coupler on the shaft first and then tap the key in with 
> a hammer?
> 
> 
> 
> 
> 
> 
> 
> Ted Hull 424
> 
> 

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