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Old 18-02-2012, 16:29   #1
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Installing Engine Shortening Shaft

I am installing a 54hp Isuzu on a 1.25" shaft. To fit this larger engine than the small Yanmar I had in there I will need to get the shaft cut. After the cut, I will have about 2 inches of shaft from the end of the stuffing box cap to the the aft end of the shaft coupler. Is this too little? (the shaft does go through the coupler). For further clarification, there is just about 2 inches of shaft visible between the shaft coupler and the stuffing box.

(The hose from the stuffing box to the stern tube is about 6 inches).

...thanks
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Old 18-02-2012, 17:26   #2
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Quote:
Originally Posted by bcguy
I am installing a 54hp Isuzu on a 1.25" shaft. To fit this larger engine than the small Yanmar I had in there I will need to get the shaft cut. After the cut, I will have about 2 inches of shaft from the end of the stuffing box cap to the the aft end of the shaft coupler. Is this too little? (the shaft does go through the coupler). For further clarification, there is just about 2 inches of shaft visible between the shaft coupler and the stuffing box.

(The hose from the stuffing box to the stern tube is about 6 inches).

...thanks
No it should be fine once you have full engagement of the shaft coupler and still have enough spare shaft to allow for engine movement. The close to the shaft log the more per precise the alignment needs to be. In addition obviously there will be the option of a flexible coupling.

Dave
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