---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Mon 06/16/14: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 07:27:13 AM PST US Subject: Kolb-List: Re: 582 Engine Vibration on Mark III From: "Rex Rodebush" 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 _____________________________________ Time: 09:30:27 AM PST US Subject: Re: Kolb-List: 582 Engine Vibration on Mark III From: Richard Girard 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 wrote : > check torque on prop bolts > > *Gary Jindra* > *mark 3 912 ul* > > > On Sunday, June 15, 2014 8:10 PM, Kolb List 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 * > > > * > =========== onics.com/Navigator?Kolb-List> =========== =========== 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 _____________________________________ Time: 12:54:33 PM PST US From: Colin Hudson Subject: Re: Kolb-List: 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" 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 > > 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3 D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kolb-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kolb-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kolb-list Browse Digests http://www.matronics.com/digest/kolb-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.