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Old 12-06-2018, 12:05 PM
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Al Schober Al Schober is offline
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A new coupling will just slide over the end of the shaft - it's not a force fit. An old coupling is hard to remove because of corrosion of the coupling. The corrosion products fill the interface. Clean up the old coupling and it will slide back into place and work fine.
The old shaft, even though scored, may be usable. First, consider the possibility of moving the stuffing box to a new location by using a shorter or longer hose to the stern tube. Then make sure the old shaft is straight. A gradual bend over the full length is removable. A short kink at the aft end taper is hard to correct and will have a adverse affect on the propeller (will make the propeller seem to have bent blades.
Plus one on having the coupling set screw seat into a good dimple in the shaft. This dimple is made with a drill bit the size of the screw, and drilled deep enough to cut it's full diameter. I've seen more that one shaft pull out of couplings because the shaft wasn't drilled.
Face seals are good things but are susceptible to scoring from grit in the water. The worst grit is the stuff you see in glacial runoff. This grit comes from the outside water trying to get into the boat. The trick to getting long life from a face seal is to feed it clean water. Water from the water pump discharge is run through a filter and then fed to the stern tube just aft of the seal. We're talking a very small flow - just more than the seal drips.
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