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582 Engine Vibration on Mark III

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kolber3(at)atcyber.net
Guest

Posted: Sun Jun 15, 2014 4:05 pm Post subject: 582 Engine Vibration on Mark III

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 the usual silky smooth to instant roughness/vibration – 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 had no effect.  The engine monitor indicated CHT and EGT to be nearly the same on both cylinders and within the normal range.  I’ve since changed 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.  Thanks.

 

Gary

  [quote][b]

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gajindra(at)sbcglobal.net
Guest

Posted: Sun Jun 15, 2014 5:51 pm Post subject: 582 Engine Vibration on Mark III

check torque on prop bolts



 

Gary Jindra

mark 3 912 ul



 

     On Sunday, June 15, 2014 8:10 PM, Kolb List <kolber3(at)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 the usual silky smooth to instant roughness/vibration â€“ 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 had no effect.  The engine monitor indicated CHT and EGT to be nearly the same on both cylinders and within the normal range.  Iâ€™ve since changed 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.  Thanks.

  

Gary



   [quote]-= the many List utilities such as List h[b]

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brubakermal(at)yahoo.com
Guest

Posted: Sun Jun 15, 2014 6:38 pm Post subject: 582 Engine Vibration on Mark III

B gear box? check inspect gear lube for gear wear  C/E gear box check rubber dampener and fly wheel end bolts around starter



 

Malcolm & Jeanne Brubaker 

Michigan Sport Pilot Repair 

 http://michigansportpilotrepair.com

 LSRM-A, PPC, WS

Great Sails - Sailmaker 

for Ultralight & Light Sport

(989)513-3022

  

  

  

  

        From: GARY JINDRA <gajindra(at)sbcglobal.net>

 To: "kolb-list(at)matronics.com" <kolb-list(at)matronics.com> 

 Sent: Sunday, June 15, 2014 9:51 PM

 Subject: Re: 582 Engine Vibration on Mark III

  

 

check torque on prop bolts



 

Gary Jindra

mark 3 912 ul



 

     On Sunday, June 15, 2014 8:10 PM, Kolb List <kolber3(at)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 the usual silky smooth to instant roughness/vibration â€“ 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 had no effect.  The engine monitor indicated CHT and EGT to be nearly the same on both cylinders and within the normal range.  Iâ€™ve since changed 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.  Thanks.

  

Gary



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Rex Rodebush

Joined: 10 Jan 2006
Posts: 209
Location: Branson West area, Missouri

Posted: Mon Jun 16, 2014 6:26 am Post 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.

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Mon Jun 16, 2014 8:30 am Post subject: 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(at)sbcglobal.net (gajindra(at)sbcglobal.net)> wrote:

  	  Quote: 	
		   check torque on prop bolts



Â 

Gary Jindra

mark 3 912 ul

 

 

      On Sunday, June 15, 2014 8:10 PM, Kolb List <kolber3(at)atcyber.net (kolber3(at)atcyber.net)> wrote:

  

  



 

 Hoping some of you fellow Kolbers have some troubleshooting ideas.Â  One a recent flight, the 582 engine on our Mark III suddenly went from being the usual silky smooth to instant roughness/vibration â€“ almost as if something suddenly broke.Â  We managed to get it back to the home airport about 13 miles away.Â  The whole airframe was shaking, but the engine seemed to be developing full power.Â  Switching from one ignition source to the other had no effect.Â  The engine monitor indicated CHT and EGT to be nearly the same on both cylinders and within the normal range.Â  Iâ€™ve since changed spark plugs, removed both carbs for disassembly, cleaning and inspection.Â  I completely drained the fuel system and put fresh premium alcohol free fuel in.Â Â  All has had no effect on the vibration.Â  Engine mounts appear to be OK - not broken.Â  The engine develops full power, but still shakes badly.Â  Â Prop is visually OK.Â  Would appreciate any tips on what to check next.Â  The next step planned is a compression check.Â  Thanks.

  Â 

Gary



   

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-- 

Zulu Delta

Mk IIIC

Thanks, Homer GBYM

It isn't necessary to have relatives in Kansas City in order to be unhappy.

 Â  - Groucho Marx

 

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_________________
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colin.scott.hudson(at)gma
Guest

Posted: Mon Jun 16, 2014 11:54 am Post subject: 582 Engine Vibration on Mark III

Check for play in the gear drive by trying to move the prop up and down. Also, even though the prop visually looks ok one of the blades could have come out of adjustment assuming itâ€™s a ground adjustable prop. Engine mounts 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(at)atcyber.net (kolber3(at)atcyber.net)> wrote:

[quote]  <![endif]-->   <![endif]-->

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 the usual silky smooth to instant roughness/vibration â€“ 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 had no effect.  The engine monitor indicated CHT and EGT to be nearly the same on both cylinders and within the normal range.  Iâ€™ve since changed 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.  Thanks.

 

Gary

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kolber3(at)atcyber.net
Guest

Posted: Tue Jun 17, 2014 7:13 pm Post subject: 582 Engine Vibration on Mark III

Update:  Thanks to all who have responded with suggestions on things to inspect.  Additional inspection/troubleshooting has still not identified a smoking gun, so I’ve made an appointment with a nearby Rotax service center later this week to trailer in the whole airplane to their facility and have them take a look at the engine and its installation.  Hopefully, this effort will identify the problem.  

  

Original Message:

 

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 the usual silky smooth to instant roughness/vibration – 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 had no effect.  The engine monitor indicated CHT and EGT to be nearly the same on both cylinders and within the normal range.  I’ve since changed 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.  Thanks.

 

Gary

  [quote][b]

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