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Dripless shaft seal maint.

Discussion in 'Viking Yacht' started by BoulderGT3, Feb 4, 2018.

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  1. MBevins

    MBevins Senior Member

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    May 23, 2008
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    Location:
    Windsor On. Canada
    My boat is in the same situation and about the same hrs and time. Spends every winter in heated storage. I installed dripless in 2003 when I had some major repairs completed. They're still running. However I have them on this winters inspection list with the yard as I am thinking the bellows might be due.
  2. 30West

    30West Member

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    Nov 14, 2016
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    Location:
    Holland, Michigan
    Response from Tides is that storage won't cause the seals to stick, but overheating will.
  3. PacBlue

    PacBlue Senior Member

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    Dana Point, Ca
    What is your preferred brand of dripless shaft seal, assuming they are the ones you have had no (long term) issues with?
  4. Capt J

    Capt J Senior Member

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    I've haven't had any issues with PSS ones. Also the ones Cabo used to use with the bronze housings were very good. I believe they were made in CA.
  5. PacBlue

    PacBlue Senior Member

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  6. d_meister

    d_meister Senior Member

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    San Diego, CA.
    +1 for Capt J's remarks about Tides and PSS. If it was ever my money; I would buy PSS. I put a set on a 1974 Chris 68' Roamer that had badly corroded and scored shafts at the packing surface. Fitted the face ring with a light coating of 3M 101, and never had a problem.
    When replacing engine zincs on a Cat 3406 equipped boat I ran, I noticed that the fuel cooler held raw water on one engine and not the other. Following the hoses, I came to the nipples on the Tides and found one completely scaled closed. Pretty odd for a nylon hose barb nipple, I thought. Went to a scheduled cleaning regimen after that.
    The problem with lack of flow into the shaft journal at the dripless seal, is that it becomes a low pressure area where air builds up from the aerated water at higher speeds passing under the hull, then resulting in loss of lubrication and cooling.
  7. 30West

    30West Member

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    Location:
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    If you lose water flow I think you'll get some noise from a PSS and other graphite sealing systems, while the rubber lip-seals like Tides stick to the shaft, and fail catastrophically without warning.

    There was a thread on another forum where someone had a noisy PSS, turned out his raw water impeller was deteriorating , and not providing enough water pressure for the shaft seal. New impeller fixed it. When the layer of water wasn't provided, the steel rotor contacted the graphite stator. It would have eventually gotten hot enough to melt the bellows, but there was enough warning.
  8. MBevins

    MBevins Senior Member

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    Location:
    Windsor On. Canada
    Out of curiosity, how do you hear such a thing?
    If I'm in the engine room and my engines are in gear and running I couldn't hear a nuclear device going off .
  9. 30West

    30West Member

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    Location:
    Holland, Michigan
    Apparently it was a chatter he'd been hearing for a while and wondering about. My seals are under my aft stateroom, not in the engine room, so maybe they're in another part of the boat. Or maybe this sound carried through the structure of the boat more than the engine sounds, which boat builder try to isolate to the engine room and/or muffle.
  10. CSkipR

    CSkipR Member

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    For what its worth I had the Cabo NZ shaft seals for 7 yrs (0riginal) and replaced the seals twice. Pain to change out. Switched to Tides and have not replaced either for 3 yrs. Hopefully I didn't jinx myself. I do remove the hose to check for water flow every year.
  11. FIQ

    FIQ Member

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    Feb 19, 2016
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    Location:
    Olympia, Wa
    I don't have crossovers on mine. From what I read, the tees should be on the seal end of the hose, correct?
  12. Silver Lining

    Silver Lining Member

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    Sep 18, 2008
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    Location:
    Chesapeake/Florida
    I have Tides on my Viking Sport Cruiser. I have changed them once in nine years and when we did I added the seal and enclosure kit so I can do one replacement in the water. The couplings only have to come off every other seal change

    My tees are not tees but a crossover on the seal flange. Each seal flange has two fittings so the crossover is completely independent from the main feed which comes off the gear cooler
  13. Capt Ralph

    Capt Ralph Senior Member

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    I have found these inter hoses to be full of sediment on some shaft services. Not a lot of water flow when all else is working correctly. Another good maintenance point when you get down there.