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  1. #1
    Join Date
    Jun 2005
    Location
    London
    Posts
    2,330

    Default Is there a trick to removing the paddle wheel in a Raymarine log

    The speed log constantly underreads. I have tried recalibrating

    I wonder if the wheel is not spinning as freely as it might. I would like to clean the housing and the pin. There is a pin that goes through from one side to the other. It is simply by an interference fit, meaning I can knock it out?
    I see that there is a kit with a replacement wheel. I am not so sure replacing it will help so I would like to try cleaning first!

    Thanks

    Tudordsailor

  2. #2
    Join Date
    Sep 2017
    Posts
    1,449

    Default Re: Is there a trick to removing the paddle wheel in a Raymarine log

    Quote Originally Posted by tudorsailor View Post
    The speed log constantly underreads. I have tried recalibrating

    I wonder if the wheel is not spinning as freely as it might. I would like to clean the housing and the pin. There is a pin that goes through from one side to the other. It is simply by an interference fit, meaning I can knock it out?
    I see that there is a kit with a replacement wheel. I am not so sure replacing it will help so I would like to try cleaning first!

    Thanks

    Tudordsailor
    raymarine have a very good q&a page if you search + i phoned yesterday for advice, all freely given & most helpful

  3. #3
    Join Date
    Nov 2009
    Location
    Southampton
    Posts
    35,606

    Default Re: Is there a trick to removing the paddle wheel in a Raymarine log

    Quote Originally Posted by tudorsailor View Post
    There is a pin that goes through from one side to the other. It is simply by an interference fit, meaning I can knock it out?
    Mine is. I have a piece of stainless wire the same diameter (or very slightly smaller) to push it through with.

    Pete

  4. #4
    Join Date
    Aug 2009
    Location
    Scotland.
    Posts
    14,368

    Default Re: Is there a trick to removing the paddle wheel in a Raymarine log

    Quote Originally Posted by prv View Post
    Mine is. I have a piece of stainless wire the same diameter (or very slightly smaller) to push it through with.

    Pete
    +1

    Like the OPs mine under reads, ST60. However, I have cleaned mine quite a few times, +10 years old, cleaned the housing and checked for smoothness. I even lubricated the pin very slightly which might not have been a good idea. I am not sure but IIRC when I blew on the impeller it spun very, very freely. Now I think it may be slightly stiffer, more a perception than anything obvious.
    "'...contradictions .... are deliberate exercises in doublethink." Orwell from 1984

  5. #5
    Join Date
    May 2001
    Location
    where democracy needs no guns
    Posts
    15,748

    Default Re: Is there a trick to removing the paddle wheel in a Raymarine log

    Quote Originally Posted by prv View Post
    Mine is. I have a piece of stainless wire the same diameter (or very slightly smaller) to push it through with.

    Pete
    I used a bradawl as a punch. IIRC pin pushed out one way not both. Also lightly applied some Teflon grease on reassembly.
    Sermons from my pulpit are with tongue firmly in cheek and without any warranty!

  6. #6
    Join Date
    Dec 2012
    Location
    Gone cruising
    Posts
    2,395

    Default Re: Is there a trick to removing the paddle wheel in a Raymarine log

    Push out the stainless axle with a suitable size drift. Only little force required. Make sure you remember the orientation (cups point with opening forward on the bottom if you didn't - arrow on the housing indicates forward direction).

    Calibration is either by manually adjusting the factor, or if you're certain there is no current running (e.g. boat is in locked in basin), you can calibrate it to SOG.

    After calibrating, it should read more or less correctly for a while. Fouling will affect it, as can air bubbles and also if it is fitted in a bad location where it doesn't have a clear flow of water or isn't deep enough.

  7. #7
    Join Date
    May 2005
    Location
    up on the moors.
    Posts
    33,341

    Default Re: Is there a trick to removing the paddle wheel in a Raymarine log

    IIRC the axle can be inserted/removed in one direction only. The pin is peened at one end.
    I think, therefore I am. I am, therefore I sail.

  8. #8
    Join Date
    Feb 2006
    Location
    N Kent Coast
    Posts
    4,167

    Default Re: Is there a trick to removing the paddle wheel in a Raymarine log

    Which log is it?

    They used to do a kit for an ST50/ST60 which was a new paddlewheel and a few other bits and bobs, and was knocked out quite easily. May well be worth it if it is not performing as it should.

  9. #9
    Join Date
    Apr 2005
    Location
    Shropshire
    Posts
    8,901

    Default Re: Is there a trick to removing the paddle wheel in a Raymarine log

    As far as I recall, its easy to tap out the spindle and remove the impeller. I use a small electrical Phillips screwdriver. As you probably know, the transducer can easily be removed from the housing even when afloat as there's a flap valve which limits water ingress. I found my ST60 impeller didn't need cleaning more than once a year but in some areas it may do.
    I have found that NASA impellers don't respond to cleaning and need a replacement service kit annually. (Fortunately they are cheap)

  10. #10
    Join Date
    Nov 2007
    Location
    Boat Orwell - Me Norwich
    Posts
    8,227

    Default Re: Is there a trick to removing the paddle wheel in a Raymarine log

    From the Owners Guide for the Airmar Tridata transducer (which i think the ST60 uses).

    Operation & Maintenance
    Anti-fouling Paint
    Surfaces exposed to salt water must be coated with anti-fouling paint. Use water-based anti-fouling paint only. Never use ketone- based paint since ketones can attack many plastics possibly damaging the transducer. Reapply paint every 6 months or at the beginning of each boating season.
    B744V/VL—Paint the following surfaces (see Figure 4).
    • Exposedareasofthehousingincludingthetransducer’sfa ce
    • Boreofthehousingup30mm(1-1/4")
    • OutsidewallofthepaddlewheelinsertbelowthelowerO-ring
    • Paddlewheelcavity
    • Paddlewheel
    • BlankingplugbelowthelowerO-ringincludingtheexposedend

    Cleaning the Sensor
    Aquatic growth can accumulate rapidly on the sensor’s surface, reducing its performance within weeks. Clean the surface with mild household detergent and a Scotch-Brite® scour pad.
    B744V/VL—If fouling on the insert is severe, push out the paddlewheel shaft using a spare shaft or a 4-D finish nail with a flattened point. Then lightly wet sand the paddlewheel with fine grade wet/dry paper.'

    I've no idea what a 4-D finish nail is, but the point (geddit?) is it can be pushed out with an appropriate drift, and it doesn't mention it only coming out in one direction (perhaps other models of transducers used by Raymarine are different?).

    IIRC the service kit for the Airmar transducer includes a replacement spindle, and suggests using the new spindle as a drift.

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