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post #1 of 11 Old 05-29-2012 Thread Starter
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What type of Shaft Coupling

On my 1980, Catalina 27, with a 5411 Universal diesel, I have a shaft coupling that covers the transmission coupling. In other words, the shaft coupling is a kind of a "drum" and you cannot see the interface of the shaft and transmission coupling. On the circumference of this "drum" are four bolts that sit in what looks to be an O ring of some sort. I'm guessing that you remove these bolts on the circumference to use your fealer gauge to true up the shaft/engine alignment. Has anyone seen this kind of shaft coupling and can you verify my assumptions above? Thanks for your help.
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post #2 of 11 Old 05-29-2012
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Re: What type of Shaft Coupling

This sounds like a flexible coupling. If so, you should not need to play with feeler gauges.


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even with a misalignment of 2, the shaft will remain perfectly centered.


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post #3 of 11 Old 05-29-2012
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Re: What type of Shaft Coupling

Yep. Definitely a Drive Saver of some type. Another version can be seen at Globe 504 5" Drivesaver Coupling*-*Globe*504 - Miscellanous Drive System Parts - Drive System Parts - Drive Systems - Engine/Mechanical - Boatersland Marine

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Re: What type of Shaft Coupling

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Re: What type of Shaft Coupling

I have a picture I'm trying to upload. Can you point me to directions for this?
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Re: What type of Shaft Coupling

My coupling looks about like this one except it has the four large hex heads surrounded by the "O" ring looking rubber. Also it doesn't look like one side fits into the other like in the below link.

MARINE SHAFT COUPLING FLEXIBLE COMBINATION 1-3/8" BORE | eBay

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Re: What type of Shaft Coupling

Greetings Ajay73. My 1981 C-27 has the same Universal 5411 as your 1980. It has wheel steering. The stuffing box hose is about shot, and I need to remove the shaft and do all the fun associated work (new stuffing box, bearings, etc.). The coupler is completely rusted out. Any help you can provide about what you did to replace your coupler and any other items, such as the process and parts sources - and any other things - would be so very much appreciated. Thanks in advance!
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Re: What type of Shaft Coupling

decreed,

I posted on sailnet two years ago when I completely rebuilt my driveline. Google search for "driveline overhaul" and you should find the thread.

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Re: What type of Shaft Coupling

Here; Contemplating a drive line overhaul


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Re: What type of Shaft Coupling

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Greetings Ajay73. My 1981 C-27 has the same Universal 5411 as your 1980. It has wheel steering. The stuffing box hose is about shot, and I need to remove the shaft and do all the fun associated work (new stuffing box, bearings, etc.). The coupler is completely rusted out. Any help you can provide about what you did to replace your coupler and any other items, such as the process and parts sources - and any other things - would be so very much appreciated. Thanks in advance!
DB, I never did have to replace the shaft coupling. I have a Federal flexible coupling. See link below. I did replace the stuffing box hose and the packing and the strut(cutlass) bearing. Removal of the shaft wasn't that bad of a job, although IIRC I did have to remove the rudder which isn't a tough job either. I have tiller steering. I can imagine that a wheel will complicate the job. Once you've been through it it'll be easy. Having the right tools is 90% of the battle. Those tools would be a prop puller and a Strut Pro type tool. I bought the strut bearing from Catalina Direct. The packing I just got locally at West Marine. Make sure you get he 3/16" for a 1 inch shaft. The mechanic I had put in 1/4 inch and the shaft ran very hot(145 F on the infrared thermometer). I replaced it myself with the 3/16 inch and the shaft cooled right down(95 F on the IT). Maybe I could have backed off the packing nut a little more and that may have worked too. But the spec is 3/16 inch. There are no set screws holding the cutlass bearing in on the C27. Just a compression fit.
Here's the coupling I have:
Marine Transmissions, Velvet Drive, Paragon, marine transmission parts,

Last edited by Ajay73; 04-06-2014 at 08:53 PM.
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