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Thread: seized duo prop

  1. #1
    Join Date
    Mar 2004
    Posts
    5,861

    Default seized duo prop

    this is from the yard:

    'Your rear (forward-most) propeller is seized onto the drive hub. This is a spline arrangement and I suspect the two have corroded together. The way to fix this is to carefully cut the propellor off the hub (it would be slotted and prised open to remove it from the spline. The spline would then need to be carefully cleaned up). This would entail, we estimate, 7 to 8 hours labour plus the cost of a replacement propeller'

    its an allu prop set up which suits me due to the shallow rivers and estuaries i boat in.

    what would you guys do ?

  2. #2
    Join Date
    Sep 2002
    Location
    South
    Posts
    16,461

    Default Re: seized duo prop

    From another thread:

    http://www.ybw.com/forums/showthread...rwBJVRmGLdY.99

    Drilling holes sounds a bit scary to me.

    ######


    Taping the blades in turn using a wooden drift for protection normally does the job. But if the props heve bee assembled with no (or the wrong type of) grease, more severe action is needed.
    I had exactly the same problem with my Duoprops a few years ago. The first (4 blade) prop came off without too much problem, but the second (3 blade) was a nightmare. I managed to borrow a very large hub puller, but even using this with heavy blows on the tensioning nut was no good. The blows were cushioned by the rubber bush instead of directly on the metal inner. The cure was to get a good quality penertating oil acting on the correct area, but at first, the oil was not getting beyond the shaft end surface. The cure was to drill a series of small holes, 1-2mm dia, and 1mm (max) deep allong each of the splines in the shaft. This has the effect of removing the hardened grease which was sealing the splines, and providing a 'retainer' for the oil. With the drive leg raised, apply penetrating oil (Plus Gas is muchh better than WD40!) and leave for a few hours. Then a few taps, and Hey presto!! Wedges (1top and 1 bottom) between the front of the prop and the ring anode retaining bolts will help force off the prop instead of a puller.
    I used Keynol (sp) waterproof greese when re-assembling and have no problem in subsequent years.
    Hope this helps

    ######

  3. #3
    Join Date
    Jun 2013
    Posts
    3,133

    Default Re: seized duo prop

    I cut a stainless one off a few years back (brought tears to my eyes). Took a couple of hours max.
    If found in the Brexit forum, please return to the real world.

  4. #4
    Join Date
    Oct 2006
    Location
    Éire
    Posts
    3,520

    Default Re: seized duo prop

    This is why I remove and greasy annually... Not much good to you.

    What about heat on the prop? Or would that wreck the prop shaft seals?

  5. #5
    Join Date
    Jan 2012
    Location
    Reading
    Posts
    520

    Default Re: seized duo prop

    A few years ago I had the same issue both the large props stuck on shaft. we created a puller and slowly pulled the Stainless prop off of the bush, The Bush was then VERY carefully cut off the shaft, This took 5 hours for the whole operation but was cheaper than destroying 2 stainless props

  6. #6
    Join Date
    Feb 2015
    Location
    Conwy
    Posts
    3,648

    Default Re: seized duo prop

    That old chestnut. Lift the drives into trailer position. Pour boiling water down the splines. I kettle full should be plenty. Video proceedings on your mobile and then offer the mechanic to put it where the sun dont shine.

    Shallow rivers and estuaries have fine silt. This gets into the grease and forms a cement. The more you pull the harder the cement gets. Just melt the grease out of the mixture and give it a few taps.

  7. #7
    Join Date
    Mar 2004
    Posts
    5,861

    Default Re: seized duo prop

    Quote Originally Posted by BruceK View Post
    That old chestnut. Lift the drives into trailer position. Pour boiling water down the splines. I kettle full should be plenty. Video proceedings on your mobile and then offer the mechanic to put it where the sun dont shine.

    Shallow rivers and estuaries have fine silt. This gets into the grease and forms a cement. The more you pull the harder the cement gets. Just melt the grease out of the mixture and give it a few taps.
    sounds reasonable, the hot water is not going to damage the shaft seal ?

  8. #8
    Join Date
    May 2001
    Location
    Worcestershire/Pembrokeshire
    Posts
    2,350

    Default Re: seized duo prop

    I think that BruceK has it right. Nothing to lose.

    Having experienced this many years ago , I made a puller from a wooden disc and various bits 'n bobs to suit the 2 sizes of duoprops. Typically only had to use it once since.
    The lesson to learn is to clean both the propshaft splines and those in the props (a cheap bottle-brush works a treat), then ensure both are well greased with waterproof grease prior to assembly.

  9. #9
    Join Date
    Apr 2007
    Location
    midlands
    Posts
    7,138

    Default Re: seized duo prop

    Been there many times . No easy fix , down to very poor if at all servicing . Dry stack boats are worse because owners think they need no maintenance as marinas use that to score punters .
    Every time the boat dries the salt stays inside the prop hub .

  10. #10
    Join Date
    Mar 2004
    Posts
    5,861

    Default Re: seized duo prop

    def poor servicing re the prop. recon it has not come off for at least 5 yrs.
    learn something new every time. shall remove and grease it myself in the future.
    it has been rinsed for the last two years since i have had the boat.

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