How to Remove a Prop Shaft from Transmission - SailNet Community
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How to Remove a Prop Shaft from Transmission

Hey Everyone, what do you think is the best way to remove this prop shaft from this flexible coupler? The transmission is a Hurth HBW 150 V and the coupler is a federal marine flexible coupling. It appears to be a press fit with a keyed shaft and 2 set screws holding it in. I'm leaning towards using a 3 jaw puller to drive it out by grabbing the back of the flexible coupling. My concern though is damaging the rubber internals of the coupler, however I see no other way to get it out. I have seen posts where people talk of using slide hammers, but I think that would be terribly damaging to the gears and bearings of the transmission.

Any thoughts on how to pull the shaft? For reassembly, do you have any ideas of how to get that shaft back in the transmission since it is such a tight fit?
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Re: How to Remove a Prop Shaft from Transmission

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Originally Posted by cdsnyder83 View Post
Hey Everyone, what do you think is the best way to remove this prop shaft from this flexible coupler? The transmission is a Hurth HBW 150 V and the coupler is a federal marine flexible coupling. It appears to be a press fit with a keyed shaft and 2 set screws holding it in. I'm leaning towards using a 3 jaw puller to drive it out by grabbing the back of the flexible coupling. My concern though is damaging the rubber internals of the coupler, however I see no other way to get it out. I have seen posts where people talk of using slide hammers, but I think that would be terribly damaging to the gears and bearings of the transmission.

Any thoughts on how to pull the shaft? For reassembly, do you have any ideas of how to get that shaft back in the transmission since it is such a tight fit?

If this is a v-drive pull the prop and the remove the shaft & coupling by pulling it forward into the boat.. One of the big benefits of a well implemented v-drive is the ability to remove the shaft with the coupling still on it. I have A v-drive as well and can have our shaft out of the boat in under 10 minutes start to finish....
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Last edited by Maine Sail; 4 Days Ago at 05:34 AM.
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Re: How to Remove a Prop Shaft from Transmission

http://www.federalmarinetransmissions.com/100101.html

There's a cutaway picture of what that coupling looks like in the link.

If there's no cabin furniture in the way, pulling the shaft into the boat as MS suggests is the ticket. Completely avoids any issues you may have with the rudder going the other way.

What exactly is the job to be done?

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Re: How to Remove a Prop Shaft from Transmission

Definitely avoid the use of a slide hammer. Pretty good way to damage the transmission.

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Re: How to Remove a Prop Shaft from Transmission

Well today was eventful.... I attempted to pull the transmission out with the prop shaft but I did not have the clearance in the cabin to get it out, the shaft is fairly long. I ended up getting a 3 jaw puller and driving the shaft out of the coupling (it was one of those moments where I was questioning how much money I was costing myself in repairs with each turn of the ratchet on the 3 jaw puller). The shaft was in there really, really tight so I'm concerned about how to get it back together. I'm hoping it will slide into the transmission easier without the key inserted, and then I can insert the key once the shaft is seated.

As to why I'm pulling the transmission and prop shaft, the engine has to come out to go to the shop. It's been sitting for a couple of years without running and the rings are not seating which is resulting in very low compression. Try as I might with lubricating oils, a special carbon eating fluid, and many attempts to free up the rings, the engine just will not come back to life. It's on a pallet now waiting to go into the shop in the morning.
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