Today's Message Index:
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1. 07:27 AM - Re: 582 Engine Vibration on Mark III (Rex Rodebush)
2. 09:30 AM - Re: 582 Engine Vibration on Mark III (Richard Girard)
3. 12:54 PM - Re: 582 Engine Vibration on Mark III (Colin Hudson)
Message 1
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| Subject: | Re: 582 Engine Vibration on Mark III |
If prop is ground adjustable make sure all angles are the same and one has not
turned.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=424928#424928
Message 2
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| Subject: | Re: 582 Engine Vibration on Mark III |
Gary, The first place I would look is for any broken welds or fractured
tubing in the fuselage weldment in the area immediately adjacent to the
engine. Start the engine and being careful of the prop feel all around the
various tubes that you can easily reach to see if the vibration can be
localized to a given area on the frame.
I wouldn't put any stock in "Prop is visually OK". You do not say what kind
and how many blades it has but all other indications being in the green,
particularly CHT and EGT being normal and matched would rule out it being
an engine issue, since the onset of trouble was sudden
Since it is cheap and easy I would suggest you pull the prop off, taking
note of the condition of its attachment bolts and their torque and the prop
hub as well. If it's an IVO, check that one of the adjustment rod lever
arms hasn't broken off by removing the adjustment screw. For all props get
a piece of 1" tubing for an axle and a couple of matching drinking glasses
and do a quick check of the balance of the prop blades. If you can borrow a
prop that you know to be running smoothly put it on and see if the
vibration goes away
Rick Girard
do not archive
On Sun, Jun 15, 2014 at 8:51 PM, GARY JINDRA <gajindra@sbcglobal.net> wrote
:
> check torque on prop bolts
>
> *Gary Jindra*
> *mark 3 912 ul*
>
>
> On Sunday, June 15, 2014 8:10 PM, Kolb List <kolber3@atcyber.net> wrote
:
>
>
> Hoping some of you fellow Kolbers have some troubleshooting ideas. One a
> recent flight, the 582 engine on our Mark III suddenly went from being th
e
> usual silky smooth to instant roughness/vibration =93 almost as if
something
> suddenly broke. We managed to get it back to the home airport about 13
> miles away. The whole airframe was shaking, but the engine seemed to be
> developing full power. Switching from one ignition source to the other h
ad
> no effect. The engine monitor indicated CHT and EGT to be nearly the
> same on both cylinders and within the normal range. I=99ve since c
hanged
> spark plugs, removed both carbs for disassembly, cleaning and
> inspection. I completely drained the fuel system and put fresh premium
> alcohol free fuel in. All has had no effect on the vibration. Engine
> mounts appear to be OK - not broken. The engine develops full power, but
> still shakes badly. Prop is visually OK. Would appreciate any tips on
> what to check next. The next step planned is a compression check. Thank
s.
>
> Gary
>
> *-= the many List utilities such as List h <http://forums.matronics.com
/>*
>
>
> *
>
===========
onics.com/Navigator?Kolb-List>
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om/contribution>
===========
>
> *
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
Message 3
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| Subject: | Re: 582 Engine Vibration on Mark III |
Check for play in the gear drive by trying to move the prop up and down. Als
o, even though the prop visually looks ok one of the blades could have come o
ut of adjustment assuming it=99s a ground adjustable prop. Engine moun
ts are the #1 culprit but it sounds like you should check all of them.
Scott Hudson
Sent from my iPhone
> On Jun 15, 2014, at 7:06 PM, "Kolb List" <kolber3@atcyber.net> wrote:
>
> Hoping some of you fellow Kolbers have some troubleshooting ideas. One a r
ecent flight, the 582 engine on our Mark III suddenly went from being the us
ual silky smooth to instant roughness/vibration =93 almost as if somet
hing suddenly broke. We managed to get it back to the home airport about 13
miles away. The whole airframe was shaking, but the engine seemed to be de
veloping full power. Switching from one ignition source to the other had no
effect. The engine monitor indicated CHT and EGT to be nearly the same on b
oth cylinders and within the normal range. I=99ve since changed spark
plugs, removed both carbs for disassembly, cleaning and inspection. I comp
letely drained the fuel system and put fresh premium alcohol free fuel in.
All has had no effect on the vibration. Engine mounts appear to be OK - no
t broken. The engine develops full power, but still shakes badly. Prop is
visually OK. Would appreciate any tips on what to check next. The next st
ep planned is a compression check. Thanks.
>
> Gary
>
>
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>
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