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Monday, November 26, 2012

Shaft Coupler Puller

For a while now, a temporary prop shaft, with coupler has been attached to the Aqua-Drive thrust bearing. Everything has been set and aligned. The mechanics under this part of the floor need to be finalized before the rest of the aft cabin framing can happen. This includes the engine waterlift muffler, plumbing and the AquaDrive secondary shaft. So, what was previously dry fitted, needs to be taken apart. Despite having tapped the the coupler onto the shaft with some oil, it was not going to part by simply pulling by hand. It is too snug. So, with a scrap 5 inch round of 1/4 inch stainless steel plate, and some bolts from the hardware store, I constructed a coupler puller. Total cost: $10.
Newly constructed puller
 Basically a round plate, with a length of all-thread in the center, and six bolts matching the pattern of the coupler.
Coupler puller mounted and being compressed to push out the shaft.
Thread all of the bolts to the coupler, set the center all thread to the center on the end of the shaft. One-by-one tighten the perimeter bolts to compress the plate and push the shaft out of the coupler. A bit tedious and time consuming, but it all comes apart in the end.

Coupler removed!
Better than whacking it with a hammer (and the damage that could be done as a result).

Having pulled a coupler on the small boat, by hacking it with bolts and various deep socket drives and extensions (not exactly what such tools are to be used for), this little device will be kept with the boat for the inevitable coupler removal in the future.

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