Stern tube repair/in situ line boring
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  1. #1
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    Default Stern tube repair/in situ line boring

    20181206_082502.jpg20181206_082458.jpg20181206_141057.jpg
    Anyone done this before
    My main concern is alignment of my bar to the trans flange
    I've read about taught wire and I can see how that would get the bar pointed at the flange but I can't see how that would get the bar squared with the flange
    Or maybe it doesn't need to be?

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    If you go to YouTube and search line boring, there are some videos that cover different size boats to ships. The equipment to do the job can be made or purchased.

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    What is the material?

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    if the engine is in the right spot to start with you can clock off the transmission flange both on the face and spigot, once you do this you will see how central the shaft is to the tube.
    you can move the engine around a bit if needed but thats a lot of mucking around to do so expect to do this in the worst case.
    just use a dial indicator and collar the boring shaft so it doesn't move back and forth axially, you can even make a mating flange to suit gearbox to the boring shaft and bolt it up but expect some droop due to weight of the shaft which will be reasonably long.
    It maybe a method if your chasing a situation where the engine is out of alignment by a lot and trying to get the shaft central to the stern tube, well reasonably close. Just so you know the transmission flange will be in alignment to the bore you make.

  5. #5
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    Quote Originally Posted by magneticanomaly View Post
    What is the material?
    Steel housing buried in fiberglass no major welding allowed
    I will be making a steel sleeve to shrink in and the cutlass will go in that

  6. #6
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    My plan so far is to set up my bar in the center for the stern tube and with a laser get it pointed at the center of the transmission flange


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