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Dripless shaft seals dripping.

Discussion in 'Props, Shafts & Seals' started by Danvilletim, Aug 31, 2014.

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  1. wdrzal

    wdrzal Senior Member

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    There are several methods of hot spray metal deposition that would be ideal. Cobalt or cobalt/nickel deposition is extremely hard and wear resistant,(there are many powered alloys available). This process could be applied then the shafts ground & polished back to original O.D. As corinthian99 mentioned you have to check cost & find a machine shop with the equipment.
  2. K1W1

    K1W1 Senior Member

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    What are you going to de couple? How did you determine the alignment of everything is still connected tight?

    First you said you had pitting and now say one is out of alignment by a known quantity of unknown units.

    A machine shop can sort out the pitting if properly equipped but cant do much about alignment unless the shaft is bent even then straightening is not often all that successful.
  3. Danvilletim

    Danvilletim Senior Member

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    My only method of determination is a check book and cell phone. Dial guage indicated that the port shaft was spinning out of true by ten one thousands. I'm told it could be the engine alignment and it could be the shaft. Cheaper to start with the engine.

    I'm also told the pitting isn't very bad...and the PSs approach would likely work with them as is.

    I'd like to avoid pulling the shafts which will also include pulling the props.
  4. K1W1

    K1W1 Senior Member

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    Hi,

    Depending where it was measured that could just be an out of round outside diameter on the coupling or whatever it was measured off.

    Drop the coupling bolts if you can and slide the shaft back a bit if a gap does not appear when the bolts are loose it only has to be a fraction of an inch and see what the clearances are using feeler blades between the mating faces.

    You should be able to do this yourself if you are slightly mechanically inclined and see if there is a big difference one way or the other.
  5. SeaLion

    SeaLion Senior Member

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    I replaced Tides seals with Lasdrop seals with very good results.
  6. Bamboo

    Bamboo Senior Member

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    Engine alignment is determined by the relation of the coupling to the engine- shaft alignment is determined by removing the shaft and checking if it fits into the struts true. You can also look at the cutless bearings to see if it rides on one side or the others aka visual inspection. Shaft roundness is by dial indicator or at the machine shop when they roll them. IIRC.
    What is so difficult about pulling the wheels? Should take less than two hours for one person to remove and re-install them.
  7. Capt Ralph

    Capt Ralph Senior Member

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    Two hours yard rate may be a rea$on.
  8. Danvilletim

    Danvilletim Senior Member

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    The only test so far is dial indicator. The yard has 5 hours props on and off.. Big props so I assume 2 people.

    So if dial indicator show out of round, is this possible that it is engine? I'm told to rule this out while still in the water.. Estimated 4 hours...
  9. K1W1

    K1W1 Senior Member

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    Which was placed where exactly?

    Out of round and out of alignment are two entirely different things. Can you rotate the shafts by hand freely? If the alingment was way out it is possible the end of the shaft is deflecting a bit when it rotates but there should be a corresponding movement in the opposite direction 180 Deg opposite. By this I mean if you get a + 0.010" plus reading in one spot you will get - reading when you go another half turn.
  10. Capt J

    Capt J Senior Member

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    I don't feel 10 thousands out of alignment on a shaft is enough to make Tide Seals leak. I think the acceptable range is 6-8 thousands on shaft alignment. The Tide seals ride on the shaft and the only thing holding them is a silicone rubber shaft tube which obviously gives. The most critical issue with them sealing would be pitting that would tear up the seals, or the shaft being worn and not the correct diameter.
  11. Bamboo

    Bamboo Senior Member

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    When I worked at Viking as a mechanic one of my jobs was to R&R props. With a propsmith and a jack cart to hold the wheels it rarely took more than 40 minutes to remove both wheels alone no matter what size wheels. Putting them on is a two man job because you should to lap them- but still it's less than 30 minutes each wheel. Might be three hours. I can see a yard charging 5 hours- and in the final bill review I'd call the yard out on this if I were you and they should back off the 5 hour to a reasonable amount. Especially if you watch the guys do it and explain they either goofed off or did take less than the 5 hours. NEVER take the yards word on a timed job and always review the final with someone that can rectify charges which are bogus.
  12. Bamboo

    Bamboo Senior Member

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    If two hours of yard rate stops you from dealing with a larger issue which may cost orders of magnitude later ....
  13. Bamboo

    Bamboo Senior Member

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    x2....
  14. Danvilletim

    Danvilletim Senior Member

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    Shafts are finally out. Engine alignment indicated a bend in coupling or shaft. Shafts go to the shop on monday

    New problem.....drain plug on heat exchanger was noted on survey....Dove in and Mechanic found the thread bung had a crack in it... Story is that the exchanger has to be taken out to radiator shop and have a new bung welded in. This sound logical ? What can I expect for uninstall and install? Weld?

    Engine is 3412 PEEC CATs
    image.jpg
  15. RER

    RER Senior Member

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    I would recommend you get the shaft work done and get out of the yard.

    Heat exchangers can be serviced at the dock.
  16. Danvilletim

    Danvilletim Senior Member

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    Separate contractor doing engine work. It will go back in the water soon, but will be hard to test shaft seals if can't run the motor.
  17. RER

    RER Senior Member

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    That's why I wouldn't do the engine work until after I get done with the yard. Your description did not indicate the motor was inop.

    I use boatyards to work on the bottom of the boat and I get out asap.

    Why work on non haulout stuff at a yard? Why pay a premium and get your boat further trashed? It's like hanging around the hospital after they tell you you can leave.
  18. Capt J

    Capt J Senior Member

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    agreed.
  19. Danvilletim

    Danvilletim Senior Member

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    Agreed. Just told them to wait. Nonetheless, how many hours for an in and out? Also is the normal or heard of?
  20. RER

    RER Senior Member

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    Before or after he tells you they might as well service the heat exchanger since they have it off anyway?

    What has to come off? ...the heat exchanger - or the pipe below the heat exchanger?

    To drain it, remove it, send it out and reinstall it ...all labor including repair and travel time probably $600. What were you quoted?

    Then there's always a possibility of some surprises. If they break off a bolt the clock keeps ticking. Stuff like that.