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Thread: Propeller key

  1. #41
    Join Date
    Nov 2009
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    Home UK Midlands / Boat Croatia
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    18,609

    Default Re: Propeller key

    Quote Originally Posted by rotrax View Post
    Interesting. That is not an engine I am familiar with.

    No doubt the manual will give instuctions for correct valve timing. I can imagine locking devices to hold the camshafts in the correct place while the pinions are tightened. Avoiding movement while tightening would be critical I imagine. It certainly is with Magneto timing.
    That's exactly right. Both the camshafts on each side have a "flat" machined into them. The cam-setting tool bolts down across the cambox with a straight edge across the two flats. The valve timing is then correct and the cam sprocket can be tightened up.

    I suppose that if one was an engine tuner one could make up a tool with the straight edge at a known different angle and independently vary the inlet and exhaust valve timing whereas with a keyed camshaft this would require different shafts or sprockets, I guess, unless one was looking for a step-change by altering the sprocket engagement with the camchain.

    Richard

  2. #42
    Join Date
    Dec 2010
    Location
    South Oxfordshire, Gosport and Wellington New Zealand.
    Posts
    7,748

    Default Re: Propeller key

    Quote Originally Posted by RichardS View Post
    That's exactly right. Both the camshafts on each side have a "flat" machined into them. The cam-setting tool bolts down across the cambox with a straight edge across the two flats. The valve timing is then correct and the cam sprocket can be tightened up.

    I suppose that if one was an engine tuner one could make up a tool with the straight edge at a known different angle and independently vary the inlet and exhaust valve timing whereas with a keyed camshaft this would require different shafts or sprockets, I guess, unless one was looking for a step-change by altering the sprocket engagement with the camchain.

    Richard
    I suspect what a tuner would do is make new sprockets up with slotted fixing holes and machine/fabricate the existing sprockets to recieve them. This is common practice on twin cam motorcycle engines. The slotted fixing holes will allow HT bolts to be used to fix the timing where the tuner wants-or thinks he wants-it. Once the optimum position is found, another hole and matching thread-not slotted this time-will fix it in position. Timing of each camshaft can be altered by the amount the slotted holes allow.

    Big trouble can occur if the fastning bolts are not drilled and lockwired.

    Ask me how I know......................

  3. #43
    Join Date
    Sep 2015
    Posts
    6

    Default Re: Propeller key

    HI Guys
    Ive got a fairline cornich my woodruff key as gone on one of my propellers , i have taken the other one off to check and measure the size,
    Do you know if there is any one local who supply the keys and castle nuts .
    Keys sizes approx 9mmx 9mm (3/8) rounded both ends , the shafts are 1.5 inch.
    thanks Stuart

  4. #44
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    43,176

    Default Re: Propeller key

    Quote Originally Posted by STUART P View Post
    HI Guys
    Ive got a fairline cornich my woodruff key as gone on one of my propellers , i have taken the other one off to check and measure the size,
    Do you know if there is any one local who supply the keys and castle nuts .
    Keys sizes approx 9mmx 9mm (3/8) rounded both ends , the shafts are 1.5 inch.
    thanks Stuart
    Whre is local ? Your profie does not give your location.

    BTW it would have been better to have started your own new topic rather than adding your question to an old thread

  5. #45
    Join Date
    Aug 2004
    Location
    Cumbria; U.K.
    Posts
    3,265

    Default Re: Propeller key

    Description is for a feather key, which is parallel in depth. Woodruff keys are approx. semi-circular in profile

  6. #46
    Join Date
    Nov 2009
    Location
    Bristol
    Posts
    532

    Default Re: Propeller key

    Back on Topic:

    Advice given to me by several engineers was to clean the taper very carefully and NOT to grease it. As mentioned earlier the taper join between the prop and shaft is the main/total force transfer; grease will both loosen that and provide a thin, and potentially self-removing, layer between the two surfaced. A while later and the prop can shake loose.

  7. #47
    Join Date
    Feb 2003
    Posts
    15,215

    Default Re: Propeller key

    Quote Originally Posted by mattonthesea View Post
    Back on Topic:

    Advice given to me by several engineers was to clean the taper very carefully and NOT to grease it. As mentioned earlier the taper join between the prop and shaft is the main/total force transfer; grease will both loosen that and provide a thin, and potentially self-removing, layer between the two surfaced. A while later and the prop can shake loose.
    Stick to electrics!

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