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#1
IP: 70.160.104.65
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shaft coupling
So I'm investigating the drip rate on the stuffing box (too fast) and I turn the stuffing box and discover there is play in the shaft to coupling connection. The lock nuts are wired. Go ahead and tell me the bad news.
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Bill McLean '76 Ericson 27 :valhalla: Norfolk, VA |
#2
IP: 76.176.224.167
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You need to determine which is the offending component, shaft or coupler, and replace as indicated. The full Monty is replace both. Good time for a MMI split coupler.
Do it right, cry once.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#3
IP: 172.58.250.46
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Thank you. Yep, Neil, that's about what I am thinking. Now we're talking an unplanned dry dock . And the shaft is unbelievably difficult to get to.
I only use the iron sail in and out of the marina. 20 mins and I don't push it. I've been waiting all summer for the wind to return and it's just coming back now. I'd like to do this when the wind gets poopy again, June, July. Will tightening the 2 wired bolts on the coupler, if loose, help?
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Bill McLean '76 Ericson 27 :valhalla: Norfolk, VA |
#4
IP: 76.176.224.167
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Yeah, you'd better tighten them up or your shaft could slip out in reverse.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#5
IP: 32.211.38.220
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Torque is transferred from the coupling to the shaft by a key. Thrust loads fore/aft are transferred by the set screws. It's important that the set screws seat into drilled recesses in the shaft, otherwise it's easy for things to get loose. And if they get loose the prop and shaft can slide aft out of the coupling.
Navy practice is to add some pieces to the coupling. The shaft gets a groove machined in it a bit back from the front end. The coupling goes on past the groove, then a pair of half-circle plates fit into the shaft groove. It all gets bolted up to the next piece forward. If the shaft pulls out of the coupling, it isn't good. If it just pulls aft a little, you lose propulsion. If it pulls aft a lot (like through the stuffing box) you could lose the boat. |
The Following User Says Thank You to Al Schober For This Useful Post: | ||
TimBSmith (11-15-2022) |
#6
IP: 172.58.189.8
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Ok, I got the bolts tight. Thanks to Blaster getting them loose. Now there is no play in the coupler to shaft joint. I have a pull out scheduled January 17. Looking to replace the coupler, shaft, stuffing box, log, possibly the cutless (or cutlass- I've seen lately)
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Bill McLean '76 Ericson 27 :valhalla: Norfolk, VA |
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