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Thread: Sierra 1975 - Vibration - idea's?

  1. #1

    Sierra 1975 - Vibration - idea's?

    Folks,

    I have a 1975 Sierra and I have noticed ( since a few
    months ie maybe 10 hours or so), that when I turn /
    bank to the left, the aircraft starts to vibrate and
    when I fly level again the vibration stops. It goes
    together with a "different sound" that the engine
    seems to make.
    The vibration can be felt throughout the aircraft,
    there is substantial more shaking of the dash for
    instance.

    I am at a loss and so is the mechanic. Any idea's
    would be appreciated.

    For instance could this because an engine mount
    bushing is worn out ?? Could this be because the
    magneto's need to be overhauled ( I am getting close
    to 500 Hrs) . What are you thinking ?? All input is
    welcome. I also have noticed that the engine oil
    tempis much higher than before and stabilizes at about
    1 1/2 needle widths from redline. Do take into account
    that it's pretty hot around here now and that airtemps
    at 3,500 are 80 - 85 degrees , so this could have
    something to do with it. However , in an attempt to
    isolate things we will replace the Vernaterm to see if
    that makes a difference. We installed complete new
    baffling and that should improve cooling , not make it
    worse but is surely could make the difference in the
    reading ie maybe the gauge is off or did not indicate
    correctly with the old baffling..
    Here is what we have done sofar as part of and after
    the annual this year:

    1/ Installed complete new baffling.
    2/ Have the prop dynamically balanced ( see my post on
    that)
    3/ Have the governor overhauled ( see my post on that
    and BTW the RPM'S now are as steady as a rock)..

    I will also get an oil analysis done just to make sure
    that there is not a bearing spinning somewhere but the
    engine had great compressions and was declared very
    healthy.

    Guys, Looking forward to some suggestions and things
    to check / look for.

    Appreciate it,.

    HarryR

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  2. #2

    Sierra 1975 - Vibration - idea's?

    Harry,
    Does it only do it in a left turn? Not right? Turn coordinated?
    Do you have a protector on the leading edge of your prop? If so, check for
    delamination or hairline crack. The turn would present a different angle of
    attack on the prop blades that may be just enough to get under the lamination
    or cause the crack to open to change pitch on that specific blade.
    Check your spinner and fore / aft spinner plates.
    Check your RIGHT wing: gear door, outboard hinge on aileron, and wing tip
    attachment / cracks. Left turn, right wing has to speed up and it may be just
    enough to get a vibration that telegraphs throughout the aircraft.
    Check the nose gear door.
    Check the cowl.

    May not be the easiest order but I would think in the order of possibilities.
    I get a vibration in strong crosswinds from the change. Also really
    noticeable on the ground when running up and not into the wind -- sometimes can't be
    helped with airport layout and locally established rules to keep the non
    flying public (who chose to buy or build next to the airfield) happy.

    Hope one of these suggestions help. Just my guess as an owner.
    Chuz


    [Non-text portions of this message have been removed]



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  3. #3

    Sierra 1975 - Vibration - idea's?

    It might be engine mount sag allowing the engine to touch the cowl
    when when baked left. Check for rub spots on the nose bowl where the
    prop comes out.




    --- In musketeermail@yahoogroups.com, Harry Roussard <hroussar@y...>
    wrote:
    > Folks,
    >
    > I have a 1975 Sierra and I have noticed ( since a few
    > months ie maybe 10 hours or so), that when I turn /
    > bank to the left, the aircraft starts to vibrate and
    > when I fly level again the vibration stops. It goes
    > together with a "different sound" that the engine
    > seems to make.
    > The vibration can be felt throughout the aircraft,
    > there is substantial more shaking of the dash for
    > instance.
    >
    > I am at a loss and so is the mechanic. Any idea's
    > would be appreciated.
    >
    > For instance could this because an engine mount
    > bushing is worn out ?? Could this be because the
    > magneto's need to be overhauled ( I am getting close
    > to 500 Hrs) . What are you thinking ?? All input is
    > welcome. I also have noticed that the engine oil
    > tempis much higher than before and stabilizes at about
    > 1 1/2 needle widths from redline. Do take into account
    > that it's pretty hot around here now and that airtemps
    > at 3,500 are 80 - 85 degrees , so this could have
    > something to do with it. However , in an attempt to
    > isolate things we will replace the Vernaterm to see if
    > that makes a difference. We installed complete new
    > baffling and that should improve cooling , not make it
    > worse but is surely could make the difference in the
    > reading ie maybe the gauge is off or did not indicate
    > correctly with the old baffling..
    > Here is what we have done sofar as part of and after
    > the annual this year:
    >
    > 1/ Installed complete new baffling.
    > 2/ Have the prop dynamically balanced ( see my post on
    > that)
    > 3/ Have the governor overhauled ( see my post on that
    > and BTW the RPM'S now are as steady as a rock)..
    >
    > I will also get an oil analysis done just to make sure
    > that there is not a bearing spinning somewhere but the
    > engine had great compressions and was declared very
    > healthy.
    >
    > Guys, Looking forward to some suggestions and things
    > to check / look for.
    >
    > Appreciate it,.
    >
    > HarryR
    >
    > __________________________________________________
    > Do You Yahoo!?
    > Tired of spam? Yahoo! Mail has the best spam protection around
    > http://mail.yahoo.com




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  4. #4

    Sierra 1975 - Vibration - idea's?

    Harry,

    I'm surprised someone hasn't suggested three right
    turns, instead. I have a 75 Sierra, and am interested
    in your problem. Does it change with engine speed, or
    with power off, or in a climb or dive, or with the
    gear down, or different flap settings? One AI I talked
    too said to check the starboard gear door, but wasn't
    real specific about what to check for, other than
    security or damage. Do you have two blades or three?
    Is there a sound that changes with wind speed? If
    there is anything I can do, let me know. Keep us
    posted.

    Dan, Sierra N9299S

    --- Harry Roussard <hroussar@yahoo.com> wrote:

    > Folks,
    >
    > I have a 1975 Sierra and I have noticed ( since a
    > few
    > months ie maybe 10 hours or so), that when I turn /
    > bank to the left, the aircraft starts to vibrate and
    > when I fly level again the vibration stops. It goes
    > together with a "different sound" that the engine
    > seems to make.
    > The vibration can be felt throughout the aircraft,
    > there is substantial more shaking of the dash for
    > instance.
    >
    > I am at a loss and so is the mechanic. Any idea's
    > would be appreciated.
    >
    > For instance could this because an engine mount
    > bushing is worn out ?? Could this be because the
    > magneto's need to be overhauled ( I am getting close
    > to 500 Hrs) . What are you thinking ?? All input is
    > welcome. I also have noticed that the engine oil
    > tempis much higher than before and stabilizes at
    > about
    > 1 1/2 needle widths from redline. Do take into
    > account
    > that it's pretty hot around here now and that
    > airtemps
    > at 3,500 are 80 - 85 degrees , so this could have
    > something to do with it. However , in an attempt to
    > isolate things we will replace the Vernaterm to see
    > if
    > that makes a difference. We installed complete new
    > baffling and that should improve cooling , not make
    > it
    > worse but is surely could make the difference in the
    > reading ie maybe the gauge is off or did not
    > indicate
    > correctly with the old baffling..
    > Here is what we have done sofar as part of and after
    > the annual this year:
    >
    > 1/ Installed complete new baffling.
    > 2/ Have the prop dynamically balanced ( see my post
    > on
    > that)
    > 3/ Have the governor overhauled ( see my post on
    > that
    > and BTW the RPM'S now are as steady as a rock)..
    >
    > I will also get an oil analysis done just to make
    > sure
    > that there is not a bearing spinning somewhere but
    > the
    > engine had great compressions and was declared very
    > healthy.
    >
    > Guys, Looking forward to some suggestions and things
    > to check / look for.
    >
    > Appreciate it,.
    >
    > HarryR
    >
    > __________________________________________________
    > Do You Yahoo!?
    > Tired of spam? Yahoo! Mail has the best spam
    > protection around
    > http://mail.yahoo.com
    >
    >
    > Join BAC today and be a part of the ONLY Type Club
    > for the Musketeer series!
    >
    > www.beechaeroclub.org
    >
    >
    > Yahoo! Groups Links
    >
    >
    > musketeermail-unsubscribe@yahoogroups.com
    >
    >
    >
    >
    >


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  5. #5

    Sierra 1975 - Vibration - idea's?

    I had a similar problem and found that the main gear door was vibrating at certain speeds. With the plane on jacks and the gear retracted check for movement on the gear door. Also look at the gap between the wing and gear door. In looking for this problem I did the prop balance thing, checked the motor mounts,stabilator bushings for play, flaps and alierons. Fixed a lot of things that maybe did not need to be fixed and made a lot of flights at different speeds. With someone else in the right seat and switching seats I thought I was able to get a feel for the location of the vibration. Finally in we removed the gear doors and the vibration went away. Replaced the rubber insulators where the doors bolt up and rerigged the doors. So far so good.


    [Non-text portions of this message have been removed]



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  6. #6

    Sierra 1975 - Vibration - idea's?

    Harry,

    I'm sure you'll get a lot of different possible answers to this problem. I
    can say that I had virtually the identical symptoms with the exception that
    mine began vibrating when I made a turn to the right. Once the turn got
    past about 20 degrees the airframe began to vibrate and shake. I thought
    it seemed like the engine was missing, and was about to quit. It shook
    with coordinated turns, but got really bad when attempting to make a
    landing with a right crosswind when requiring a right wing down slip.

    The problem in my case turned out to be quite simple, but then I guess all
    problems are simple once you have the answer. It turned out that an
    adjustment to the right flap position was all that was needed to solve the
    problem. The flap was adjusted very slightly back, and ever so slightly down.

    I don't know if a similar approach would help you, but it did the trick in
    my case. I sure know how frustrating these kinds of things can be to try
    and resolve. Good luck,

    Dale Jester (IXD)
    N24022, '77 Sundowner

    At 12:54 PM 7/23/2005, Harry Roussard wrote:
    >Folks,
    >
    >I have a 1975 Sierra and I have noticed ( since a few
    >months ie maybe 10 hours or so), that when I turn /
    >bank to the left, the aircraft starts to vibrate and
    >when I fly level again the vibration stops. It goes
    >together with a "different sound" that the engine
    >seems to make.
    >The vibration can be felt throughout the aircraft,
    >there is substantial more shaking of the dash for
    >instance.




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  7. #7

    Sierra 1975 - Vibration - idea's?

    Harry -
    Vibration is a problem not to play with, as things can break and
    coming off in flight. If it's not one of the readily found items
    suggested items (gear doors, etc) I'd get real serious about finding
    the cause, probably starting with aileron/flap pivot & control
    bearing wear, the stabilator inspection (AD), prop bolt torques,
    both ends of each engine mount bolt, the wing spar inspection (AD),
    etc.
    Bob
    A&P, Aero Eng

    --- In musketeermail@yahoogroups.com, Harry Roussard <hroussar@y...>
    wrote:
    > Folks,
    >
    > I have a 1975 Sierra and I have noticed ( since a few
    > months ie maybe 10 hours or so), that when I turn /
    > bank to the left, the aircraft starts to vibrate and
    > when I fly level again the vibration stops. It goes
    > together with a "different sound" that the engine
    > seems to make.
    > The vibration can be felt throughout the aircraft,
    > there is substantial more shaking of the dash for
    > instance.
    >
    > I am at a loss and so is the mechanic. Any idea's
    > would be appreciated.
    >
    > For instance could this because an engine mount
    > bushing is worn out ?? Could this be because the
    > magneto's need to be overhauled ( I am getting close
    > to 500 Hrs) . What are you thinking ?? All input is
    > welcome. I also have noticed that the engine oil
    > tempis much higher than before and stabilizes at about
    > 1 1/2 needle widths from redline. Do take into account
    > that it's pretty hot around here now and that airtemps
    > at 3,500 are 80 - 85 degrees , so this could have
    > something to do with it. However , in an attempt to
    > isolate things we will replace the Vernaterm to see if
    > that makes a difference. We installed complete new
    > baffling and that should improve cooling , not make it
    > worse but is surely could make the difference in the
    > reading ie maybe the gauge is off or did not indicate
    > correctly with the old baffling..
    > Here is what we have done sofar as part of and after
    > the annual this year:
    >
    > 1/ Installed complete new baffling.
    > 2/ Have the prop dynamically balanced ( see my post on
    > that)
    > 3/ Have the governor overhauled ( see my post on that
    > and BTW the RPM'S now are as steady as a rock)..
    >
    > I will also get an oil analysis done just to make sure
    > that there is not a bearing spinning somewhere but the
    > engine had great compressions and was declared very
    > healthy.
    >
    > Guys, Looking forward to some suggestions and things
    > to check / look for.
    >
    > Appreciate it,.
    >
    > HarryR
    >
    > __________________________________________________
    > Do You Yahoo!?
    > Tired of spam? Yahoo! Mail has the best spam protection around
    > http://mail.yahoo.com





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