I'm using a
1. new shaft
2. new split coupler
3. new shaft bearing
The shaft is 20 inches long, going into a direct drive transmission. Vessel is a Bristol 30 with a hard-mount (e.g. shim aligned).
The old prop shaft and coupler exhibited no vibration or other problems, despite a worn out shaft (cutlass) bearing.
Things I did that might have been out of the ordinary - I loosely bolted on the coupler, with a few threads of play. I aligned the key, hub and shaft and lightly tapped the shaft into the coupler from the outside with a rubber mallet. Then I tightened the hex bolts and set screws, then tightened the hub onto the output coupler. I did not reface the coupler - I imagine that was done before I ever got the coupler.
There is visible movement of the shaft - the stuffing box moves a bit when I crank on the engine. Its enough to be visible on a cell phone camera (and more visible in person).
I'm trying to avoid having to realign the engine.
What can I try? I already tried loosening up the stuffing box and the hose clamps and re-bolting the coupler. I don't think its prudent to install a flex coupler in between. I could try removing the shaft, then bolting down the coupler firmly onto the output coupler and then re-installing the shaft. Or perhaps I should try reusing the old coupler? Boat is on the hard.
thanks in advance. (I'm so happy Moyer Marine exists so I can keep my old engine running!)
1. new shaft
2. new split coupler
3. new shaft bearing
The shaft is 20 inches long, going into a direct drive transmission. Vessel is a Bristol 30 with a hard-mount (e.g. shim aligned).
The old prop shaft and coupler exhibited no vibration or other problems, despite a worn out shaft (cutlass) bearing.
Things I did that might have been out of the ordinary - I loosely bolted on the coupler, with a few threads of play. I aligned the key, hub and shaft and lightly tapped the shaft into the coupler from the outside with a rubber mallet. Then I tightened the hex bolts and set screws, then tightened the hub onto the output coupler. I did not reface the coupler - I imagine that was done before I ever got the coupler.
There is visible movement of the shaft - the stuffing box moves a bit when I crank on the engine. Its enough to be visible on a cell phone camera (and more visible in person).
I'm trying to avoid having to realign the engine.
What can I try? I already tried loosening up the stuffing box and the hose clamps and re-bolting the coupler. I don't think its prudent to install a flex coupler in between. I could try removing the shaft, then bolting down the coupler firmly onto the output coupler and then re-installing the shaft. Or perhaps I should try reusing the old coupler? Boat is on the hard.
thanks in advance. (I'm so happy Moyer Marine exists so I can keep my old engine running!)
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